Academic literature on the topic 'Germination percentage'
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Journal articles on the topic "Germination percentage"
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David, Andrew. "Germination Percentage and Germination Speed of European Larch (Larix decidua Mill.) Seed After Prolonged Storage." Northern Journal of Applied Forestry 19, no. 4 (2002): 168–70. http://dx.doi.org/10.1093/njaf/19.4.168.
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Abstract Thirty European larch seedlots stored in plastic, screw-capped containers at 4°C for 3 to 24 yr were tested for their viability. The average germination percentage was 26.7% per seedlot. Fifty percent of all germinating seeds germinated by the 20th day after sowing and 90% had germinated by the 26th day. Correlation analysis indicated there was a significant negative association between years in storage and germination percentage and a significant positive association between years of storage and the number of days required to reach 15% germination. Although one seedlot germinated no seeds after 10 yr in storage, 21 of 30 seedlots, ranging from 3 to 24 yr in storage, maintained a minimum germination percentage of 20%.
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Harp, Derald A., Michael Wade, D. Frank Gilman, and John Calahan. "Hormonal Effects on the Germination Response of Chasmanthium latifolium." HortScience 30, no. 4 (1995): 836D—836. http://dx.doi.org/10.21273/hortsci.30.4.836d.
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Caryopses of Chasmanthium latifolium removed for the florets, treated with solutions containing 0.02 M KNO3, 0.5 mM GA3, and/or 0.1 mM kinetin, placed in germination chambers at alternating temperatures of 15/30C, and percentage germination was checked at 7, 14, and 21 days. Treatments with kinetin and/or KNO3 significantly increased germination percentage over other treatment combinations. The maximum germination percentage for Chasmanthium latifolium was achieved by removing the caryopsis from the floret, treating the caryopsis with 0.02 M KNO3, and germinating for 14 days at alternating temperatures of 15/30C.
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Carpenter, William J., and Joseph F. Boucher. "Germination and Storage of Vinca Seed Is Influenced by Light, Temperature, and Relative Humidity." HortScience 27, no. 9 (1992): 993–96. http://dx.doi.org/10.21273/hortsci.27.9.993.
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Light, temperature, relative humidity (RH), and GA3 affect vinca [Catharanthus roseus (L.) G. Don] seed storage and/or germination. GA3 failed to increase the germination percentage in darkness but significantly increased the percentage in continuous light. Similarly, GA3 treatment reduced both the number of days required to achieve 50% of the final germination percentage (T50) and the span between 10% and 90% germination (T90 — T10) for seeds in light, but not in darkness. Germination percentages were maximal and about equal at 25, 30, or 35C in darkness; germination was lowest below 25C. Germination T50 and T90 — T10 required the fewest days between 25 and 35C. Reducing seed moisture from 9.9% to 3.9% increased the T50 from 2.4 to 3.0 days but failed to change germination percentages. Germination percentage declined linearly as seed storage temperatures were reduced from 5 to — 20C, whereas days to T50 increased. Seed storage for 12 months without reduction in germination percentage was possible at 5C and 11%, 33%, or 52% RH, but storage at 75% or 95% RH for periods exceeding 1 month reduced germination. Seeds stored at 33% or 52% RH required fewer days to T50 than did seeds stored at 11%, 75%, or 95% RH. Chemical name used: gibberellic acid (GA3).
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Tabatabaei, S. A. "The Changes of Germination Characteristics and Enzyme Activity of Barley Seeds under Accelerated Aging." Cercetari Agronomice in Moldova 48, no. 2 (2015): 61–67. http://dx.doi.org/10.1515/cerce-2015-0030.
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Abstract Seed aging is the main problem of seed storage. Changes of enzyme activity and reduction of seedling growth are consequence of seed deterioration. An experiment was conducted to evaluate the effects of accelerated aging on germination indexes and enzyme activity of barley seeds. Seeds were incubated in closed plastic boxes for the accelerated aging treatments at 41°C. Three accelerate aging regimes were performed by placing seeds at 41°C and relative humidity (RH) of 90-100 % for 0, 4 and 8 day periods. Our results showed that increasing aging duration resulted higher reduction in germination percentage, germination index, mean time to germination, normal seedling percentage, catalase and ascorbate peroxidase. The highest germination percentage, germination index, normal seedling percentage and enzyme activity were achieved in control conditions (0 day of aging). Under aging conditions, germination percentage, means time to germination, germination index, normal seedling percentage and enzyme activity decrease significantly. Also, our results indicated that seed aging is related to decrease of enzymes and may contribute to low germination efficiency. The general decreases in enzyme activity in the seed lowers the respiratory capacity, which in turn lowers both the energy (ATP) and assimilates supply of the germinating seed, also decrease in antioxidant enzymes is linked to an increased accelerated ageing and decreased germination characteristics. Subsequently, proposed a positive relationship between antioxidant enzyme capacity and the vigour of the seed
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Bradford, Kent J., Daniel Côme, and Françoise Corbineau. "Quantifying the oxygen sensitivity of seed germination using a population-based threshold model." Seed Science Research 17, no. 1 (2007): 33–43. http://dx.doi.org/10.1017/s0960258507657389.
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AbstractSeeds vary widely in the sensitivity of germination to oxygen (O2) partial pressure, depending upon the species, temperature, dormancy state and physiological status of the seeds. Most analyses of the O2 sensitivity of germination have focused on final germination percentages and estimated the O2 percentage in air that is required to reduce germination to a given percentage (usually 50%). In contrast, we have applied a population-based threshold model utilizing time courses of germination to quantify three parameters related to seed germination sensitivity to O2 availability: the median base (or threshold) O2 percentage, the standard deviation of O2 thresholds among seeds in the population, and an oxygen–time constant that relates O2 percentage to germination timing. The model fits germination responses accurately across a wide range of O2 concentrations. The response to O2 was logarithmic in all cases, with the O2 percentage required for 50% germination ranging from 21% to as low as 0.005%, depending upon the species, the temperature and the seed dormancy level. Modelling indicated that some seeds can adapt to low O2 percentages and shift their thresholds to lower values over time. Lower temperatures decreased the minimum O2 threshold, as did after-ripening. Seed priming generally reduced the oxygen–time constant and increased the standard deviation of germination responses, but had relatively little effect on the O2 sensitivity per se. The population-based threshold model can be used to quantify the O2 sensitivity of seed germination and to predict germination rates and percentages when O2 availability is limiting.
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Liu, Mengzhou, Ning Qiao, Bing Zhang, et al. "Differential responses of the seed germination of three functional groups to low temperature and darkness in a typical steppe, Northern China." PeerJ 10 (December 1, 2022): e14485. http://dx.doi.org/10.7717/peerj.14485.
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Seed germination is a key stage in the life history of plants, which has a crucial effect on plant community structure. Climate change has substantially altered the surface soil temperature and light availability, which can affect seed germination. However, whether the seed germination of different functional groups is affected by the interactions of light and temperature remains unclear. Under laboratory conditions, we examined the effects of low temperature and darkness, as well as their interaction, on the seed germination of 16 species belonging to three plant functional groups (annual and biennials, perennial grasses, and perennial forbs) in a typical steppe, Northern China. We found that low temperature had a significant negative effect on seed germination of all species. Low temperature significantly decreased the final germination percentage and germinative force of the three plant functional groups, and the germination duration of perennial grasses. Darkness significantly decreased the germinative force of perennial forbs and total seeds, and the germination duration of perennial grasses. The interactive effects of light and temperature on the seed final germination percentage and germinative force of perennial grass indicated that darkness strengthened the inhibitory effect of low temperature on the seed germination of the grass functional group. Our study indicate that the seed germination of different plant functional groups varied greatly in response to changing environmental conditions. Our results suggest that future climate change could alter the regeneration and species composition of plant communities through changing seed germination.
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Zargar, Tahoora Batool, Faiza Ashraf, and Szilvia Veres. "Peg- Induced Drought Stress Effects on Spinach Germination Parameters." Review on Agriculture and Rural Development 10, no. 1-2 (2021): 126–32. http://dx.doi.org/10.14232/rard.2021.1-2.126-132.
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Exposure to the drought stress reduces germination rate and seedling's growth with significant variations from crop to crop. An unavoidable consequence of drought exposure is the generation of reactive oxygen species. They can be extremely reactive with several cellular constituents such as proteins, lipids, and nucleic acids. Spinach (Spinacia oleracea L.) is one of the most consumed vegetable species, rich in vitamins, such as vitamin C, and minerals, which are essential for human health. Besides, spinach contains large amounts of bioactive molecules such as glucuronic acid derivatives of flavonoids and p-coumaric acid derivatives that exhibit strong antioxidant activity Osmotic solutions of polyethylene glycol (PEG) are commonly used to control water potential in seed germination studies. PEG reduces the water potential of osmotic solutions but may limit oxygen availability to germinating seeds. The purpose of this study was to determine whether seed immersion in PEG solution had a detrimental effect on total Germination percentage, Relativized percentage, Mean germination time, Mean germination rate, Coefficient of variation of germination time, Coefficient of the velocity of germination, Germination index, Uncertainty of germination process, Synchronization index, Time to 10% germination, Time to 25% germination, Time to 50% germination, Time to 75% germination, Time to 90% germination, Time from 10 to 90% germination, Time from 25 to 75% germination, Mean daily germination Percent, Peak value for germination, Germination value. A controlled experiment was conducted to investigate the effects of drought stress, induced by PEG, on these germination parameters in Spinach. For control, seeds were treated with nutrient solution, and 2.5% PEG was used to induce drought stress. The seeds were germinated geotropically between moisten filter papers. Each roll contained 30 seeds. Overall germination parameters showed a decrease as compared to control. The germination percentage of control seeds of Spinach oleracea L. was 79% while those treated with PEG were only 63%. Similarly, the relativized percentage decrease was observed in the case of PEG-treated seeds. Relativized percentage of control seeds was 91% as treated seeds were only 73%. Both showed a significant decrease as compared to the control.
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Mohammed, Abdullah. "Effect of gibberellic acid on germination and seedling growth of Soybean (Glycine max L. Merrill)." Bionatura 8, no. 2 (2023): 1–6. http://dx.doi.org/10.21931/rb/2023.08.02.41.
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The germination percentage of Soybeans is susceptible and affected by many external and internal factors. Screening of three varieties of soybeans (Shimaa, Industrial2, and M103) during laboratory germination and field emergence was conducted to identify varieties with superior performance under four concentrations of gibberellic acid (0, 75, 150, 225 ppm). Experiments were conducted in Field Crops Dept./College of Agriculture/Tikrit University. Results showed significant differences between gibberellic acid concentrations, varieties, and interactions for all studied traits. Seeds treated with a concentration of (150 ppm) were superior in laboratory germination and field emergence percentages, averaging 92.58% and 59.08%, respectively. Varieties of Shimaa and M103 were superior in giving the highest germination percentage in the laboratory, 87.5% and 87.94%, respectively. The Shimaa variety outperformed, giving the highest field emergence percentage, 58.00%. Interaction of Shaima x150 ppm (GA3) showed the highest laboratory germination percentage and highest field emergence percentage, 96.75% and 63.25%, respectively. These Results indicate that the use of gibberellic acid significantly increased the germination rate of soybean seeds and field emergence rate due to the role of this hormone in stimulating the synthesis of enzymes necessary for germination and seedling vigor. Keywords: Soybean; GA3; Seed germination percentage; Field emergence percentage.
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Hussain, Afrida, and Dhruva Jha. "Seed Germinatio n Improvement in Two Threatened Medicinal Plants." Current Agriculture Research Journal 2, no. 2 (2014): 131–36. http://dx.doi.org/10.12944/carj.2.2.10.
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Rauvolfia serpentina (L.) Benth. ex Kurz. and R. tetraphylla L. are threatened because of extensive utilization for their wide ranging medicinal applications. The seed mediated propagation is unsatisfactory due to dormancy and poor germination percentage. This however, decelerates the conservation strategy of these species. Thus, efforts were made in this study to break dormancy and improve germination of seeds of the two species for boosting conservation. The viability of R. serpentina and R. tetraphylla were found to be 67% and 82% respectively. Germination percentage of treated R. serpentina seeds showed improved germination percentage of 34.94% (H2O2) and 48.65% (GA3) over control (11.27%). The germination percentages of treated R. tetraphylla seeds were improved to 52.70% (KNO3) and 56.66% (GA3) as compared to untreated seeds (31.26%). Temperature also influenced the germination percentage and the highest germination percentage was obtained at 35oC and 30oC respectively in R. serpentina and R. tetraphylla. Results of the treatments indicate the presence of coat induced and non-deep physiological dormancy in both these species. The datas were statistically analyzed by analysis of variance (P<0.01).
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Gbèhounou, Gualbert, Arnold H. Pieterse, and Jos A. C. Verkleij. "Longevity ofStrigaseeds reconsidered: results of a field study on purple witchweed (Striga hermonthica) in Bénin." Weed Science 51, no. 6 (2003): 940–46. http://dx.doi.org/10.1614/ws03-0221r1.
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Germination and longevity of purple witchweed seeds stored in nylon gauze bags in the soil in situ were tested in northern Bénin over a 2-yr period, covering the rainy seasons in 1994 and 1995. The seeds were collected at Ina Station in November 1993 from corn and sorghum fields. It appeared that germination percentages of the seeds, which were stimulated by GR24 to germinate, as well as their viability according to a tetrazolium test, decreased steadily in wet soil. During the 1994 rainy season, germination percentage of seeds, which reached maximum values of 30 to 74%, decreased to values of 11 to 17%. During the 1995 rainy season, the number of germinating seeds decreased further, and at the end of this season the germination percentage approached zero. Seed viability also decreased in line with the decrease in germination. In addition to the study on longevity under field conditions, seeds also were exposed to various water regimens in pots. In the pot experiment, purple witchweed seed viability and germination declined in moist soil treatments. The dying-off process observed contradicts the common opinion on longevity ofStrigaseeds in their natural environment. “Wet dormancy” was not observed in the course of the rainy season.
Dissertations / Theses on the topic "Germination percentage"
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Hilli, A. (Anu). "The effect of crop quality and pre-treatment on germination in Scots pine and Norway spruce seeds." Doctoral thesis, University of Oulu, 2009. http://urn.fi/urn:isbn:9789514290121.
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Abstract
Weather conditions during the growing season are determining the size and quality of the Scots pine (Pinus sylvestris L.) and Norway spruce (Picea abies (L.) Karst.) seed crop in northern areas. Pathogens, fungi, and insects also have an effect on seed crops. The varying quality of seeds from forest stands and seed orchards does not full fill the germination requirements of tree nurseries. Multi-phase pre-treatment are therefore used in forest tree seed centres to improve seed lots quality.
The main objectives of this study were to analyse long-term variation in the size and quality of Scots pine seed crops in Northern Finland. Determine the impact of fungal injuries on the structures of Norway spruce seeds. To detect changes in the germination capacity and rate of Norway spruce seeds during pre-treatment phases and to determine the impacts of short-term and long-term storage on the germination of treated seeds.
The study found that in most years, regeneration of Scots pine in Northern Finland is limited by quantity as well as quality the seed crop. The long-term average of the Scots pine seed crop was 77seeds/m2 and the long-term average expected germination percentage was 61%. Aeciospores of the inlad spruce cone rust Chrysomyxa pirolata (Körnicke) Wint. were found to form inside Norway spruce seeds, destroying the nucellar layers and reducing germination of seeds. In general, the germination capacity and rate of Norway spruce seeds increased during pre-treatment phases. The germination capacity of seeds increased about 30% and the rate by more than 40% during pre-treatment. During long-term storage the germination capacity and rate of pre-treated Scots pine seeds were preserved better in frozen storage than in cool storage. It was found that pre-treated Scots pine forest stand seeds can be stored for several years in frozen conditions. The germination capacity and rate of pre-treated orchard seeds were effected significantly more than those from forest stands. It is therefore recommended that Scots pine seeds from orchards be stored without pre-treatment. The germination capacity and rate of treated Norway spruce seeds from orchards was not significantly different after one year of storage.
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Lopes, Susana Weber. "Características físicas e fisiológicas de Aquênios de Lychnophora ericoides Mart. (Arnica-do-campo) de uma população ocorrente na serra da Bocaína, região do Alto Paranaíba, Minas Gerais." Universidade Federal de Uberlândia, 2008. https://repositorio.ufu.br/handle/123456789/12153.
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Lychnophora ericoides is a shrub like species, endemic to rock outcrops
areas, whose cultivation practices are unknown and its irregular maturation being the
great problem for seedling production. The objective of the work was to evaluate the
germination of L. ericoides cypsela collected from across different altitudes of a
population occurring in the Serra da Bocaina, region of Alto Paranaíba, Minas Gerais,
and submitted to methods for cypselas selection with relation to density. In the first
experiment, arnica capitulum of 20 access (altitudes between 1102 and 1245m) formed
a completely randomized design, with 20 access (treatments) and four repetitions, in
groups with 50 cypselas removed from the borders of the capitulum. In the second
experiment, samples of the same cypselas were placed in a blower for 3 minutes and 20
seconds, the heaviest being separated in two groups. Half of the cypselas were washed
in running water for 24 hours and the other half were submerged in sulfuric acid for 1
minute and soon after washed in running water for 24 hours. After the separation, the
germination test was set up in a completely randomized design in factorial scheme of 2
x 20, the first factor corresponding to treatments (water and sulfuric acid) and the
second factor, to the 20 access in four repetitions containing 50 cypselas. In both
experiments, the cypsela were distributed in gerbox containing blotting paper
humidified with distilled water, being counted, first the cypselas germinated in function
of the protrusion of the radicle and, in the second, normal seedlings. In the first
experiment, the cypselas presented low percentage of germination (maximum 15%).
The small difference between the germination percentage and viability indicated that
few cypselas at the end of the germination test were viable, a result proven by the high
percentage of empty cypselas (above 65.5%). The percentage relative to germination
(full cypselas) showed high capacity of cypsela germination (72.38, 78.13 and 66.85%
for cypselas from access 1, 3 and 5, respectively). The variation of the altitude gradient
of 143 m was not lineally related to the presence of empty seeds, not even to the
physiologic quality of the cypselas. The cypsela germination was slow and distributed
over time. After the density test, the maximum germination was also low (maximum
34% for the access 2 submitted to sulfuric acid). The use of sulfuric acid after the
density test, in a general way, improved the quality of the cypselas and increased the
percentage of cypsela germination of same.<br>Lychnophora ericoides, conhecida como arnica-do-campo, é uma espécie
arbustiva, endêmica dos campos rupestres, cujas práticas de cultivo são desconhecidas,
sendo a maturação desuniforme o grande problema para produção de mudas. O objetivo do
trabalho foi avaliar a germinação de cipselas de L. ericoides coletados de acessos em
diferentes altitudes de uma população ocorrente na Serra da Bocaina, região do Alto
Paranaíba, Minas Gerais e submetidos a métodos para seleção dos cipselas quanto à
densidade. No primeiro experimento, capítulos florais de 20 acessos (altitudes entre
1102 e 1245 m) formaram um delineamento inteiramente casualizado, com 20 acessos
(tratamentos) e quatro repetições, em parcelas com 50 cipselas retirados das bordas dos
capítulos. No segundo experimento, amostras dos mesmos cipselas foram colocadas em
soprador por 3 minutos e 20 segundos, sendo os mais pesados separados em dois
grupos. Metade dos cipselas foi lavada em água corrente por 24 horas e a outra metade
ficou submersa em ácido sulfúrico por 1 minuto e em seguida lavados em água corrente
por 24 horas. Após a separação, o teste de germinação foi instalado em delineamento
inteiramente casualizado em esquema fatorial 2 x 20, sendo o primeiro fator
correspondente aos tratamentos (ácido sulfúrico e água) e o segundo fator, aos acessos
em quatro repetições contendo 50 cipselas. Em ambos os experimentos, os cipselas
foram distribuídos em gerbox contendo papel mata-borrão umedecido com água
deionizada, sendo contados, no primeiro, os cipselas germinados em função da
protrusão da radícula e, no segundo, plantas normais. No primeiro experimento, os
cipselas apresentaram baixo percentual de germinação (máximo 15%). A pequena
diferença entre o percentual de germinação e de viabilidade indicou que poucos cipselas
no final do teste de germinação estavam viáveis, resultado comprovado pelo elevado
percentual de cipselas chochos (acima de 65,5%). O percentual relativo de germinação
(cipselas cheios) mostrou alta capacidade de germinação dos cipselas (78,13; 72,38 e
66,85% para cipselas dos acessos 7, 11 e 20, respectivamente). A variação do gradiente
de altitude de 143 m não esteve linearmente relacionada à presença de cipselas chochos,
nem mesmo com a qualidade fisiológica dos mesmos. A germinação dos cipselas foi
lenta e distribuída no tempo. Após o teste densimétrico, a germinação máxima também
foi baixa (máximo 34% para cipselas do acesso 2, quando submetidos ao ácido
sulfúrico). A utilização de ácido sulfúrico após o teste densimétrico, de maneira geral,
aumentou o percentual de germinação dos cipselas de alguns acessos.<br>Mestre em Agronomia
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Bonfim, Daniela Cristina. "Alterações no desenvolvimento de Lactuca sativa L. e Dalbergia miscolobium Benth. produzidas por extratos de folhas de Brachiaria decumbens Stapf. e Melinis minutiflora Beauv." Universidade Federal de São Carlos, 2007. https://repositorio.ufscar.br/handle/ufscar/1924.
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Previous issue date: 2007-06-13<br>The present study objected to appraise in vitro the kind of interference that
is produced by addicion of leaves extracts Brachiaria decumbens Stapf and Melinis
minutiflora Beauv. (exotic species, alien weeds) collected in raining season
(12/01/2006) and dry season (10/08/2006) over germination and initial development of
Lactuca sativa L. (bioindicator species) and Dalbergia miscolobium Benth. (native
species of savanna). It were verified also that pH and osmotic potencial of both B.
decumbens and M. minutiflora extracts did not cause interference in seed germination
indices. The germination of D. miscolobium was not affected by leaves extracts
obtained of material collected in dry season and raining season. The germination speed
was more sensitive to action of extracts than germination percentage of L. sativa. The
total length of the seedlings was reduced in practically all treatments when, compared
with the control group, however significative statistical differences were observed just
in above-ground part of the seedlings of L. sativa treated with leaves extracts of B.
decumbens collected in dry season. The L. sativa root was stimulated when leaves
extracts of M. minutiflora collected in dry season was added in Petri dishes. For
seedlings of D. miscolobium the leaves extracts of B. decumbens collected in dry season
decreased the length of the above-ground part and the root, and the same was observed
for leaves extracts of M. minutiflora collected in the raining season. Anatomy studies of
root-tip cells carried of D. miscolobium e L. sativa showed that the extracts of B.
decumbens e M. minutiflora cause damage on the root cells of seedlings with different
intensities, but the root cells of D. miscolobium, showed alterations most emphasized.<br>O presente estudo teve por objetivo avaliar in vitro qual o tipo de
interferência é produzido pela adição de extratos de folhas de Brachiaria decumbens
Stapf e Melinis minutiflora Beauv (espécies exóticas, invasoras do cerrado), coletadas
na estação chuvosa e na estação seca sobre a germinação e o desenvolvimento inicial de
Lactuca sativa L. (espécie bioindicadora) e Dalbergia miscolobium Benth. (espécie
nativa do cerrado). Foi verificado também que o pH e o potencial osmótico dos extratos
de B. decumbens e M. minutiflora não causaram interferência nos índices de germinação
das sementes. A germinação de D. miscolobium não foi afetada pelos extratos foliares
obtidos de material coletados nas estações seca e chuvosa. A velocidade de germinação
foi mais sensível à ação dos extratos do que a porcentagem de germinação de L. sativa.
O comprimento total das plântulas foi reduzido em praticamente todos os tratamentos
quando, comparados ao grupo controle, contudo, diferenças estatisticamente
significativas foram observadas apenas na parte aérea das plântulas de L. sativa tratadas
com extratos de folhas de B. decumbens coletadas na estação seca. Houve estímulo do
crescimento radicular de L. sativa quando extrato de folhas de M. minutiflora colhidas
na estação seca foi adicionado ao meio. Para as plântulas de D. miscolobium o extrato
de folhas de B. decumbens colhidas na estação seca reduziu o comprimento da parte
aérea e da raiz, sendo o mesmo fato observado com o uso de extrato de M. minutiflora
da estação chuvosa. Estudos anatômicos de tecidos meristemáticos das raízes de D.
miscolobium e L. sativa evidenciaram que os extratos de B. decumbens e M. minutiflora
provocaram danos às células das raízes destas plântulas em diferentes intensidades, mas
as células das raízes de D. miscolobium, exibiram alterações mais acentuadas.
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Silva, Juliane Gomes da. "Armazenabilidade de pirênios de Byrsonima Crassifolia (l.) Kunt muricizeiro, em função de diferentes metódos de superacão de dormência." Universidade Federal do Tocantins, 2016. http://hdl.handle.net/11612/366.
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O muricizeiro como popularmente é conhecido, pertence a família Malpighiaceae, gênero Byrsonima e mais especificadamente a espécie crassifolia L. Rich, nativa do bioma Cerrado, com principal dispersão na Amazônia e ampla distribuição geográfica. A utilização de métodos rápidos e eficientes para a determinação da umidade de sementes pode auxiliar na preservação de espécies florestais, já que a umidade é um dos fatores que mais influenciam no processo de deterioração das sementes florestais. Objetivou-se determinar o grau de umidade presente nos pirênios de Byrsonima crassifolia e avaliar a germinação dos pirênios durante o armazenamento. Os frutos foram coletados no Reassentamento Mariana-Palmas-TO. Os frutos passaram por processo de beneficiamentos, onde foi removida a polpa dos frutos, seguida da desidratação dos pirênios, que foi realizada em três etapas: primeira o teste de umidade inicial dos pirênios, logo após o beneficiamento utilizando o método da estufa a 105 ± 3ºC, por 24 horas, com cinco repetições e recipientes contendo 5 gramas de pirênios. Segunda etapa, o método de secagem intermitente de todos os pirênios do trabalho, na estufa a 40ºC por 30 minutos até estabilizar o peso, sendo repetida por 16 vezes. Por fim a determinação do grau de umidade final, pelo método da estufa a 105 ± 3ºC, por 24 horas, com cinco repetições e recipientes contendo 5 gramas de pirênios secos. A umidade inicial dos pirênios de Byrsonima crassifolia foi de 49,71% e a umidade final de 6,3%, dessa forma pode-se inferir que os pirênios estão adequados para o armazenamento e/ou submissão a testes de germinação. Posterior ao teste de umidade foi realizado o teste de germinação com os pirênios de Byrsonima crassifolia, considerando o tempo de armazenamento de 0,60,120 e 180 dias e os métodos superação da dormência, sendo: escarificação química com ácido sulfúrico (H2SO4) concentrado por 20 e 40 minutos; ácido giberélico na concentração 500mg L-1 (GA3) por 24 e 48 horas; escarificação mecânica com lixa número 80 por 30 segundos; lixa número 80 por 30 segundos mais imersão em água por 24 e 48 horas respectivamente e o Testemunha. Foi avaliado a porcentagem de germinação (%G) e índice de velocidade de germinação (IVG) dos pirênios de Byrsonima crassifolia, em cada período de semeadura. Byrsonima crassifolia, apresentou melhores resultados aos 120 dias de armazenamento e os métodos mais eficientes foram na escarificação química, resultados superiores foram evidenciados com H2SO4 40 minutos e GA3 48 horas, porém o armazenamento e todos os métodos de superação da dormência apresentaram resultados, o mais satisfatório, portanto foi aos 120 dias.<br>The use of fast and efficient methods for determining seed moisture can help in the preservation of forest species, because moisture is one of the factors that most influence on the deterioration of forest seeds. The objective is to investigate whether the moisture content can influence the storage and/or submission to germination tests, also to test the mechanisms of dormancy, duration and efficient methods that facilitate the germination in species of pyrenes. The experiment was conducted in three stages: first stage was tested the method of stove at 105 ± 3 °C for 24 hours, with five repetitions and containers with 5 grams of wet seeds. Second stage, the method of intermittent drying in the stove at 40 °C for 30 minutes until stabilize the weight, repeated by 15 times. Third stage method of stove at 105 ± 3 °C for 24 hours, with five repetitions and containers with 5 grams of dried seeds. Byrsonima crassifolia presents characteristics of orthodox species, with high humidity after the beneficiation, but to be subjected to drying procedures reached low water levels, however, remained within normal limits. The wet basis of the pyrenes of Byrsonima crassifolia found was of 49.71% of moisture and in the dry basis reached 6.3% of moisture, this way can be inferred that the seeds tested are suitable for storage and / or submission to germination tests. After the humidity test was conducted the germination test with the pyrenes of Byrsonima crassifolia, considering the storage time of 0, 60, 120 and 180 days and the methods of overcoming dormancy, being: chemical scarification with sulfuric acid (H2SO4 ) concentrated by 20 and 40 minutes; gibberellic acid concentration 500mg L-1 (GA3) for 24 and 48 hours; mechanical scarification with sandpaper number 80 for 30 seconds; sandpaper number 80 for 30 seconds more immersion in water for 24 and 48 hours respectively and the control. The objective is to evaluate the germination percentage (% G) and germination speed index (GSI) of pyrenes of Byrsonima crassifolia, in each planting period. Byrsonima crassifolia, has better results at 120 days of storage and the most efficient methods were chemical scarification, superior results were evidenced with H2SO4 40 minutes GA3 48 hours, however the storage and all methods of overcoming dormancy presented results, the most satisfactory was to the 120 days.
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Barbado, Norma. "Produção de mudas de Schinus terebinthifolius RADDI provenientes de sementes coletadas em diferentes locais e submetidas a níveis de luminosidade." Universidade Estadual do Oeste do Paraná, 2014. http://tede.unioeste.br:8080/tede/handle/tede/1466.
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Previous issue date: 2014-08-27<br>The collection site of seeds and the environment where seedlings develop can be limiting factors for the development of forest plants. Therefore, this study aimed to evaluate the germination and seedling growth of the pink pepper tree (Schinus terebinthifolius RADDI), grown from seeds from four locations with different altitudes (São Francisco do Sul - SC, Foz do Iguaçu - PR, Maringá PR and Guarapuava - PR) and developed under different light conditions (50, 60, 70 and 100%). The seeds were collected from three arrays of each selected place and sent to Refúgio Biológico Bela Vista de Itaipu, where a sample was taken for analysis of vigor and germination according to the methodology of the Rules for Seed Analysis. The experimental design used in the germination test was randomized with twelve replicates of 50 seeds per treatment. Analyses related to the development of the seedlings occurred from collections in 30, 60, 90 and 120 days after sowing, assessing growth rates on the plant height, the size of the root, diameter of the collect, the number of leaves, fresh and dry weight of leaves, fresh and dry weight of stem + petiole, fresh and dry weight of root, fresh weight and total dry mass. The experiment was arranged in triple factorial scheme with four levels for each factor (43). The factors evaluated were: local seed collection, luminosity and time, with nine replications, discarding the two highest and the two lowest values. Data were analyzed by multivariate analysis of variance and for the meaningful responses to the variables it was used analysis of variance univariate and Tukey test. To identify the best treatment for the production of seedlings of Pink Pepper, the set of response variables (b1) from the treatments applied to principal component analysis (PCA) on the correlation matrix (Pearson) of variables and the criterion for retention of principal components (PCs) used was "broken-stick", also used on the randomizing test. The seeds that showed better percentage of normal seedlings, better germination in the first count (7 DAS), higher index of germination speed, best length of roots and shoots of seedlings at 21 DAS were those from São Francisco do Sul - SC. The seeds that showed the lowest germination rate and a lower percentage of the first count germination (7 DAS), were from Maringá - PR. The best seedlings of the Pink Pepper were obtained from seeds collected in Maringá - PR at 70% brightness, with lower variability. The seedlings that had the lowest rates of development were produced with the seeds of São Francisco do Sul - SC and Foz do Iguaçu - PR at 50% brightness<br>O local de coleta de sementes e o ambiente onde as mudas se desenvolvem, podem ser fatores limitantes para o desenvolvimento de mudas de plantas florestais. Diante do exposto, a execução deste estudo teve como objetivo avaliar a germinação e o crescimento de plântulas de aroeira vermelha (Schinus terebinthifolius RADDI), oriundas de sementes provenientes de quatro locais com diferentes altitudes (São Francisco do Sul - SC, Foz do Iguaçu - PR, Maringá - PR e Guarapuava - PR), desenvolvidas sob diferentes condições de luminosidade (50, 60, 70 e 100%). As sementes foram coletadas de três plantas matrizes de cada local selecionado e encaminhadas ao Refúgio Biológico Bela Vista de Itaipu, onde foi retirada uma amostra para as análises do vigor e germinação das sementes de acordo com a metodologia das Regras para Análise de Sementes. O delineamento experimental usado no teste de germinação foi inteiramente casualizado, com doze repetições de 50 sementes por tratamento. As análises relacionadas ao desenvolvimento das mudas produzidas ocorreram a partir das coletas em 30, 60, 90 e 120 dias após a semeadura, avaliando-se as taxas de crescimento relativas à altura da planta, ao tamanho da raiz, ao diâmetro de coleto, ao número de folíolos, a massa fresca e massa seca das folhas, a massa fresca e massa seca do caule + pecíolo, a massa fresca e massa seca da raiz, a massa fresca e massa seca total. O delineamento experimental foi organizado em esquema fatorial triplo, com quatro níveis em cada fator (43). Os fatores avaliados foram: local de coleta das sementes, luminosidade e tempo, com nove repetições, descartando-se os dois maiores e os dois menores valores. Os dados foram avaliados por meio da análise de variância multivariada e para as variáveis respostas significativas, utilizou-se a análise de variância univariada e o teste de Tukey. Visando identificar o melhor tratamento para a produção das mudas de aroeira-vermelha, no conjunto das variáveis respostas (b1) provenientes dos tratamentos aplicou-se a análise de componentes principais (PCA) sobre a matriz de correlação (Pearson) das variáveis e o critério de retenção de componentes principais (PCs) adotado foi o de broken-stick , também foi utilizado o teste de randomização. As sementes que apresentaram melhor porcentagem de plântulas normais, melhor porcentagem de germinação na primeira contagem (7 DAS), maior índice de velocidade de germinação, melhor comprimento de raiz e parte aérea das plântulas aos 21 DAS, foram as oriundas de São Francisco do Sul - SC. As sementes que apresentaram menor índice de velocidade de germinação e menor porcentagem de germinação na primeira contagem (7 DAS), foram as provenientes de Maringá - PR. As melhores mudas de aroeira vermelha foram obtidas a partir de sementes coletadas em Maringá - PR a 70% de luminosidade, apresentando menor variabilidade. As mudas de aroeira vermelha que apresentaram as menores taxas de desenvolvimento foram as produzidas com sementes de São Francisco do Sul - SC e Foz do Iguaçu - PR a 50% de luminosidade
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Hopkins, Crofton Russell. "The effect of homoeopathic treatment on percentage germination of lettuce (lacuta savita) seeds and the effect of a homoeopathic antidote upon these treatments." Thesis, 1998. http://hdl.handle.net/10321/1959.
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Dissertation submitted in partial compliance with the requirements for the Master's Degree in Technology: Homoeopathy, Technikon Natal, 1998.<br>The purpose of this investigation was to evaluate the effects of homoeopathic medicine treatments on Lactuca sativa (lettuce) seed germination. It was hypothesized that Sulphur, Nitric acid and Camphor treatments would effect seed germination and that a combination of the formative two treatments individually combined with Camphor at the same potency levels would have an antidotal effect when compared to the original outcome. Four experiments were conducted: Experiment 1 - Germinability trial utilizing high germinability Commander cultivar seed (96% germinability) involving the application of four homoeopathic treatments (Sulphur, Nitric acid, Sulphur/Camphor, Nitric acid/Camphor) at thirty different potency levels (3CH~32CH) and a Control. Experiment 2 - Germinability trial utilizing 0% germinability Commander cultivar seed involving application of four homoeopathic treatments (Sulphur, Nitric acid, Sulphur/Camphor, and Nitric acid/Camphor) at four different potency levels (3CH, 9CH, 15CH & 30CH) and a Control. Experiment 3 - Germinability trial utilizing three different cultivars (Greenfield, Great Lakes and Grand Rapids) involving application of five homoeopathic treatments (Sulphur, Nitric acid, Sulphur/Camphor, Nitric acid/Camphor and Camphor) at four different potency levels (3CH, 9CH, 15CH & 30CH). Experiment 4 - Germinability trial utilizing four different cultivars (Commander, Greenfield, Great Lakes and Grand Rapids) involving one homoeopathic treatment (Camphor 3CH) under four different light and temperature conditions (light @ 15\xB0C; light @ 29\xB0C; dark @ 15\xB0C and dark @ 29\xB0C). The investigation supported the above hypotheses with clear measurable and statistically significant differences being noted for Sulphur, Nitric acid and Camphor on lettuce seed germination. Camphor showed consistently faster germ inability when compared to other treatments independent of cultivar type. Combined treatments of Sulphur/Camphor and Nitric acid/Camphor (in &<br>M
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Monegi, Piet. "Effects of nutrient-tannin interactions on intake and germination of woody plant species by ruminants." Diss., 2017. http://hdl.handle.net/10500/22831.
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Woody plant encroachment is one of the major problems worldwide because it affects negatively the herbaceous layer, which provide forage for livestock production. However, the role of ruminants particularly browsers in the dispersal of woody plant seeds still remains a concern for farmers interested in grass production. Seedpods of various woody plant species constitute a crucial part of the diet of herbivores during the dry season because of their high nutritional quality compared to herbaceous material. The interaction of associated diet quality, seed characteristics and animal species among other factors play a pivotal part in the success of livestock faecal seeds dispersion. Furthermore, dispersed seeds that successfully grow into mature woody plants become an important source of protein for herbivores. The use of woody plants as a source forage is known to be limited by plant secondary metabolites (PSMs) such as condensed tannins.
The objectives of this study were to determine 1) the effects of condensed tannins and crude protein of Vachellia tortilis and Dichrostachys cinerea pods in seed recovery and germination fed to goats, and 2) the effects of diet mixing on the feed intake of plant species by goats. In the first experiment, a total of 12 female indigenous goats and 12 female Pedi sheep were utilised in this study, with the average body weights of 29.50 kg ± 1.60 (S.E) and 28.70 kg ± 1.60, respectively. Twelve goats were grouped into two groups of six goats per group, one group was fed D. cinerea pods and the other group was fed V. tortilis pods. The group of 12 sheep were divided similarly, the one group was fed D. cinerea pods and the other group was fed V. tortilis pods. Each animal was given V. tortilis and D. cinerea pods at 2.50% of their body weight. All animals were allowed to consume D. cinerea or V. tortilis pods within 24 h, after which the remaining pods were collected and weighed. Faecal collection commenced immediately after the 24 h pods feeding and was carried on until no seeds were discovered in faeces. All faeces extracted from sheep and goats were collected daily in the morning from the faecal bags.
In the second experiment, a total of 24 indigenous goats with average body weight of 26.6 kg ± 0.51 were utilised. Goats were arbitrarily selected and grouped into four groups of six goats per group (goats were placed individually in 2 m2 pens). Each group was fed one of the following diets: diet one - Searsia lancea, diet two - S. pyroides, diet three - Euclea crispa and diet four - was a combination of the three plant species (Searsia lancea, S. pyroides and Euclea crispa). Searsia lancea, S. pyroides and E. crispa branches were collected every morning prior to feeding, and were weighed before offering the animals. Refusals were gathered and weighed, and intake was calculated as distinction between weight in and refusals. Plant species foliage were analysed for crude protein, condensed tannin, acid detergent lignin, acid detergent fibre and neutral detergent fibre.
During the first experiment, the cumulative percentage seed recovery of V. tortilis from goats (46.00 % ± 1.90) and sheep (52.00 % ± 2.93) was significantly higher than D. cinerea from goats (13 % ± 1.47) and sheep (24.00 % ± 1.16). Germination percentage of D. cinerea seeds that passed through the gastro-intestinal tract of goats (33.12 % ± 2.94) and sheep (36.00 % ± 2.68) was significantly higher than V. tortilis seeds that passed through the gastro-intestinal tract of goats (28.98 % ± 2.68) and sheep (23.04 % ± 2.81). Average D. cinerea (34.56 % ± 1.99) and V. tortilis (26.02 %± 2.10) seeds that went through the gastro-intestinal of goats and sheep had a significantly higher germination rate than the control (i.e. no passage through the gut; D. cinerea = 2.31 % ± 1.55, V. tortilis = 5.07 % ± 2.68). The high mean cumulative percentage seed recovery of V. tortilis (18.80 %) may be attributed to the relatively higher crude protein than D. cinerea (12.20 %). This may encourage animal seed dispersal and germination of woody plant species with relatively high crude protein content.
In the second experiment, Searsia lancea contained 8.50 % CP, 21.46 % acid detergent fibre (ADF), 12.50 % ADL and 39.37 % NDF. Searsia pyroides had 9.03 % CP, 27.07 % ADF, 10.89 % ADL and 40.30 % NDF. Euclea crispa had 6.19 % CP, 26.20 % ADF, 16.63 % ADL and 30.02 % NDF. Mixed diet (combination of the three plant species) had 8.96 % CP, 23.72 % ADF, 11.13 % ADL and 38.28 % NDF. Searsia lancea had 2.70 % of CTs while S. pyroides had 5.20 % CT, E. crispa had 6.44 % CT and mixed diet had 7.20 % CT. The mean dry matter intake varied significantly among dietary groups (P < 0.001). Similarly, goats offered a mixed diet consumed more CTs (P < 0.01) than those offered individual forage species.
The high mean cumulative percentage seed recovery of V. tortilis may be attributed to the higher crude protein of V. tortilis (18.80 %) than D. cinerea (12.20 %). Higher passage rate may encourage animal seed dispersal and germination of plant species. The results from experiment two support the postulation that animals foraging in mixed diet systems consume more PSMs and achieve higher dry matter intake than animals confined to monocultures or single species feeding systems. Given that woody plant encroachment is already reducing farm-grazing capacities in African savannas and this problem is predicted to double by 2050, strategies that improve herbivore ability to consume woody plants will increase forage availability and inform bush control programmes and policies. Moreover, the concomitant increase in CTs by goats exposed to diets with diverse species also has positive implications for animal<br>Agriculture, Animal Health and Human Ecology<br>M. Sc. (Agriculture)
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Тоцька, Тетяна Віталіївна. "Вплив окисно-відновного потенціалу та pH води на проростання трав’янистих рослин". Магістерська робота, 2020. https://dspace.znu.edu.ua/jspui/handle/12345/1505.
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Тоцька Т. В. Вплив окисно-відновного потенціалу та pH води на проростання трав’янистих рослин : кваліфікаційна робота магістра спеціальності 101 "Екологія" / наук. керівник О. Ф. Рильський. Запоріжжя : ЗНУ, 2020. 57 с.<br>UA : Робота викладена на 57 сторінках друкованого тексту, містить 4 таблиці та 8 рисунків. Перелік посилань включає 70 джерело. Об’єктом дослідження даної роботи є насіння представників трав’янистої рослинності: 1) Газонна травосуміш світлолюбива, 2) Газонна травосуміш тіньовитривала та 3) Конюшина біла. Мета роботи: дослідити вплив окисно-відновного потенціалу (ОВП) та водневого показнику (рН) води, з різних джерел, на проростання трав’янистих рослин. Методи дослідження: лабораторний експеримент, оцінка впливу ОВП та рН на проростання насіння газонної суміші світлолюбивої та тіньовитривалої, конюшини білої. Одержанні цифрові данні опрацьовані методами математичної статистики. Новизна роботи полягає в тому, що вперше проводилося виявлення впливу окисно-відновного потенціалу та рН води, з різних джерел поблизу м. Енергодар, на проростання трав’янистих рослин. Значущість роботи – результати дослідження являють наукове обґрунтування впливу ОВП та рН води на проростання трав’янистих рослин, на основі аналізу відсотка схожості, енергії проростання та розмірів коріння та пагону паростків. На підставі результатів дослідження підтверджено існування впливу ОВП та рН води на проростання трав’янистих рослин. Отриманні результати можуть бути використанні навчальними закладами та фахівцями з сільського господарства, в особистості аграріями.<br>EN : The work is presented on 57 pages of printed text, contains 4 tables and 8 illustration. The list of references includes 70 sources. The object of research of this work is the seeds of representatives of herbaceous vegetation: 1) Lawn grass mixture is light-loving, 2) Lawn grass mixture is shade-tolerant and 3) white clover. The ame of the work: to investigate the effect of redox potential (ORP) and hydrogen index (pH) on the germination of herbaceous plants. Methods: laboratory experiment, evaluation of the effect of ORP and pH on the germination of seeds of lawn mixture light-loving and shade-tolerant, white clover. All digital data are processed by methods of mathematical statistics. The novelty of the work lies in the fact that for the first time the influence of redox potential and pH of water from various sources near of city Energodar, on the germination of herbaceous plants was revealed. Significance of the work – the results of the study provide a scientific basis the influence of ORP and pH of water on the germination of herbaceous plants, based on the analysis of the germination percentage, germination energy and size of roots and shoots. Based on the results of the study, the existence of the influence of ORP and pH of water on the germination of herbaceous plants was confirmed. The obtained results can be used by educational institutions and specialists in agriculture, in particular by farmers.
Book chapters on the topic "Germination percentage"
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Nautiyal, P. C., K. Sivasubramaniam, and Malavika Dadlani. "Seed Dormancy and Regulation of Germination." In Seed Science and Technology. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-5888-5_3.
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AbstractSeed germination and dormancy are vital components of seed quality; hence, understanding these processes is essential for a sound seed production system. The two processes are closely interrelated and regulated, both by genetic as well as environmental factors. While dormancy provides an inherent mechanism aimed at the survival of the plant species to withstand adverse external conditions by restricting the mature seed from germinating, the ability of the dehydrated seed to remain viable and produce a vigorous seedling upon hydration under favourable conditions is the key to the survival and perpetuation of the plant species. In addition, quality seed is expected to result in timely and uniform germination under favourable field conditions after sowing to establish a healthy crop stand. Therefore, in seed technology, dormancy is not considered a desirable trait in the seed lots used for sowing. Thus, to achieve the highest germination percentage, understanding the factors controlling these two interlinked and contrasting processes is vital. In seed testing and seed trade, knowledge of seed germination and dormancy is needed for a reliable assessment of seed quality and its planting value, and to make right decisions. Though much is yet to be understood, the present status of knowledge on these aspects has made significant advances, especially in genetic control, molecular mechanism, and physiological and environmental factors influencing germination and dormancy. The information compiled in this chapter may help the seed technologists in developing new methods for breaking dormancy and testing germination,
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Aher, Rangnath. "Agricultural Application of Mycorrhiza on Growth, Yield, and Quality of Lycopersicon Esculentum Mill-A Case Study." In Industrial Applications of Soil Microbes. BENTHAM SCIENCE PUBLISHERS, 2024. https://doi.org/10.2174/9789815124996124040008.
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The present investigation deals with the effect of six different species of mycorrhizal inoculation on the germination and growth of Lycopersicon esculentum Mill (Tomato). This experiment was conducted to observe the efficient VAM inoculation that would be beneficial for plant growth. Tomato occupies a prominent position in vegetables and is a commercially exploited crop. The local variety of tomatoes (1057) was inoculated with six different AM fungal inoculums in the germinating media. The germination percentage and plant vigour were increased by different VA mycorrhizal fungi. The minimum number of days taken for germination was observed by Glomus fasciculatum (6 days) followed by G. mosseae, G. monosporum, G. heterosporum, G. geosporum and G. multicaule (7 days). The highest germination percent was recorded with G. fasciculatum (96%) followed by G. geosporum (94.12 per cent) when compared to the control. The highest shoot height, root length, fresh shoot weight and the highest fresh root weight were recorded with Glomus fasciculatum compared to the control and other VA fungal species. Hence, it is concluded that AM fungi help in better seed germination by mutualistic symbiosis.
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El Fargani, Marwan, Amal El Khaddari, Mohamed Ouajdi, Fatima Aabidi, Najib Magri, and Zidane Lahcen. "Seed Size Impact on the Vitality and Hardiness of Cork Oak Seed Seedlings." In Advances in Bioinformatics and Biomedical Engineering. IGI Global, 2025. https://doi.org/10.4018/979-8-3693-9450-2.ch024.
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Quercus suber L. species is endemic to the forests of the Mediterranean basin, offering great socio-economic and ecological value. Nevertheless, its populations face specific challenges linked to germination, development, and climate quality improvement. The aim of this study is to determine the effect of different cork oak seed sizes on germination and seedling growth and to find out how hardy and resistant the plants are to unsuitable environmental conditions. The results obtained showed the effect of cork oak seed size on the germination rate estimated after three cultivation periods of 20, 30, 60, and 80 days. The maximum germination percentage (66.90%) resulted from the use of medium-sized seeds, followed by large seeds (59.75%). On the other hand, the highest germination rate (89.52%) was observed after 80 days, with no significant difference from that achieved after 60 days. In addition, large seeds produced the longest seedlings (28.17 cm) and the largest diameter (3.53 mm) compared with the control.
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Beier, Samara Pedroso, Chaiane Guerra da Conceição, Eracilda Fontanela, Lanes Beatriz Acosta Jaques, Camila Fontoura Nunes, and Vinícius dos Santos Cunha. "Chemical treatment, different conditions and storage periods on the physiological quality of rice seeds." In Engineering and its advancements. Seven Editora, 2024. http://dx.doi.org/10.56238/sevened2024.004-002.
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Seed is considered as the main input in agriculture, which must have physiological quality to reach its maximum productive potential. In addition, the germination test is one of the parameters to analyze the viability and represent the emergence in the field when sowing is carried out in ideal soil conditions. Therefore, this work aims to evaluate the germination percentage of rice seeds (Oryza sativa) cultivar IRGA 431 CL from the year 2021 with and without seed treatment, stored for different periods in prototypes of vertical silos and big bags. The experiment was carried out at the Post-Harvest Laboratory of the Federal University of Pampa – Alegrete Campus, where they remained for 6 (six) months. The germination tests were set up every 30 (thirty) days throughout the storage period, in the laboratory of the Cooperativa Agroindustrial de Alegrete LTDA. The design to be used was completely randomized (DIC), three-factorial (2 x 2 x 6) for the factors seed treatment levels, type of storage and storage period. There are twenty-four treatments, each with four replications, totaling ninety-six experimental units + initial analysis + final analysis (composed of 4 replications for the use or not of seed treatment). The factors were composed of two seed treatments (T1: with seed treatment; T2: no seed treatment), two storage levels (A1: prototype mini silo; A2: prototype big bag) and six different storage periods (P1: thirty days; P2: sixty days; P3: ninety days; P4: one hundred and twenty days; P5: one hundred and fifty days and P6: one hundred and eighty days). After setting up the germination tests, the counts were performed on the fifth and fourteenth day after insertion in the incubator. The results indicated that there was a reduction in the percentage of vigor and germination throughout the storage period, under the presence of seed treatment, regardless of the type of storage used. Storage in impermeable packaging is less harmful to the physiological quality of the seeds, and the percentage of germination was higher than 80% in all treatments, in accordance with Normative Instruction No. 45 of 2013 for commercialization. From the first 30 days, the portion of treated seeds started to have a decrease in the physiological quality of rice seeds.
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Ferreira, Camila Cristina de França, Josimar Gurgel Fernandes, Galba Maria Campos-Takaki, and Rosileide Fontenele da Silva Andrade. "Allelopathic effect of extracts of Salicornia neei Lag. In the germination of lettuce seeds (Lactuca sativa L.)." In CONNECTING EXPERTISE MULTIDISCIPLINARY DEVELOPMENT FOR THE FUTURE. Seven Editora, 2023. http://dx.doi.org/10.56238/connexpemultidisdevolpfut-170.
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Salicornia neei is a halophyte plant that has a high interest in food, pharmaceuticals, and health maintenance. In this work, the objective was to evaluate the allelopathic effect of extracts prepared with the root, stem, and leaves of Salicornia neei applied to smooth lettuce (Lactuca sativa L.) seeds. For this, the extracts were prepared using 1g (root, stem, and leaf) macerated and solubilized in water. Then, the smooth lettuce seeds were soaked in the extracts for 30 and 60 minutes. The influence of the extracts on root growth (CR), germination percentage (PG) and germination index (GI) were evaluated. The results showed that the number of lettuce seeds germinated (after soaking for 30 min and 60 min) in all extracts of S. neei (root, stem, and leaf) was higher than the number of germinated seeds in the control treatment. In addition, the maximum germination percentage (PG) was obtained after treatment with seeds soaked in the extracts of S.neei leaf (soaking for 30min) and extract of S.neei root (soaking for 30min), both with PG of 130%. On the other hand, the maximum germination index (GI%) occurred after soaking treatment (for 60min) with S.neei leaf extract.In addition, the extract with the greatest biostimulant potential in root growth was the extract of Salicornia neei leaves (soaked for 60min). Therefore, the investigations carried out in this study show that the seed of smooth lettuce (Lactuca sativa var. capitata) soaked in leaf and root extract for 30 min were the ones that most promoted germination in smooth lettuce (Lactuca sativa var. capitate).
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M. Andrew, Samora, Siwa A. Kombo, and Shabani A.O. Chamshama. "Germination and Seedling Growth of Entandrophragma bussei Harms ex Engl. from Wild Populations." In Vegetation Index and Dynamics. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.97489.
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Entandrophragma bussei Harms ex Engl. (wooden banana) is an important indigenous multipurpose tree species endemic to Tanzania. The species has a long history of human use but recent increased utilization pressure, deforestation and high mortality rate of seedlings threaten the survival of natural populations in the wilderness. Therefore, to facilitate domestication, two experimental studies were conducted to evaluate variations in seed germination and seedling growth of three wild populations at the Directorate of Tree Seed Production Laboratories in Morogoro, Tanzania. Germination percentage, mean germination rate, final germination rate and germination index varied significantly among the populations. In terms of seedling growth there was a significant difference in number of leaves among the populations at 3 months of age. The number of course roots and seedling shoot fresh weight varied significantly among the studied populations at 10 months of age. Ruaha population had the highest survival (56%) followed by Kigwe (41%) and Tarangire being the last (36%). The two experiments have clearly demonstrated the existence of considerable variation in germination and seedling growth traits in E. bussei. These traits may prove to be important tools for selection of suitable seed sources for domestication and tree improvement programmes.
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Alves, Adriana Ursulino, and Edson de Almeida Cardoso. "Influence of different conventional and alternative substrates on sombro seed germination." In DEVELOPMENT AND ITS APPLICATIONS IN SCIENTIFIC KNOWLEDGE. Seven Editora, 2023. http://dx.doi.org/10.56238/devopinterscie-123.
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Germination is a factor of great importance in the production of forest seedlings, being correlated, normally, with the type of substrate, as well as the quality of the seed and the climatic conditions to which it is submitted. Thus, the objective was to evaluate the influence of conventional and alternative substrates on the germination of seeds of Clitoria fairchildiana (sombrero). The work was carried out at the Seed Technology Laboratory of the Department of Engineering at the Federal University of Piauí, in the municipality of Bom Jesus - PI. The design used was completely randomized, totaling 10 treatments (T1 - bovine manure; T2 - vermiculite; T3 - washed sand; T4- bioplant ® ; T5 - buriti wood; using 100% of each material; T6 - vermiculite + bioplant ® ; T7 - washed sand + vermiculite; T8 - bioplant ® + washed sand; T9 - bovine manure + buriti wood; using mixtures (50% + 50%); and T10 - washed sand + buriti wood + bovine manure (20% + 40% + 40), with four replicates. Germination (% GERM), first germination count (% PC), germination speed index (IVG), length and dry mass of seedlings were evaluated. The collected data were submitted to the analysis of variance using the ASSISTAT statistical program and the means were compared by the Scott-Knott test, at 5% probability. Treatment T9 promoted a higher percentage of germination and IVG, being indicated for the germination of sombrero seeds. greater initial germination, as well as greater seedling length.
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Deochand Lade, Bipin, Arti Sanjay Shanware, and Ruchika M. Barapatre. "Synthesis, Characterization of Dichlorofluorescein Silver Nanoparticles (DCF-SNPs) and Their Effect on Seed Germination of Vigna radiata." In Silver Micro-Nanoparticles - Properties, Synthesis, Characterization, and Applications. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96756.
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The main objective of this study was to investigate whether dichlorofluorescein (DCF) is adequate for the formulation of stable dichlorofluorescein-induced silver nanoparticles under the boiling method to analyze their effects on the seed germination of Mung seeds (Vigna radiata). Preliminary dichlorofluoresceine nanoparticles (DCF-SNPs) synthesis evidence by noticing the solution color transformed from a light green color to a dark brown color. The 2.5 ml of dichlorofluoresceine (DCF) solution was found sufficient for the formulation of dichlorofluoresceine induced silver nanoparticles at boiling conditions. Purified dichlorofluoresceine nanoparticles (DCF-SNPs) measure an average diameter of 293 nm where the majority of nanoparticles were around 159 nm in size with the surface load of-9.35 mV zeta potential value. The impact of dichlorofluorescein silver nanoparticles (DCF-SNPs) on the germination percentage of V. radiata has shown that, the 25% concentration of DCF-SNPs is excellent for the growth of Mung seeds (V. radiata). Overall, the dichlorofluorescein silver nanoparticles may be constructive for improving the percentage of seed germination at 25% of its concentration and may also be useful for fluorescent measurement using the confocal microscopy technique. Hence, dichlorofluorescein silver nanoparticles (DCF-SNPs) are proposed as an efficient detection system for nanoparticles in agrochemicals for plants.
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Vizotto, Danielly Lima, Monallysa Soares de Sá, Nicolas Oliveira de Araújo, Carlos Cicinato Vieira Melo, Ana Izabella Freire, and Filipe Bittencourt Machado de Souza. "OPTIMIZATION OF COTTON SEED DEVELOPMENT WITH COMMERCIAL INOCULANT." In Roots of the Future: Innovations in Agricultural and Biological Sciences. Seven Editora, 2024. http://dx.doi.org/10.56238/sevened2024.032-009.
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Cotton is a crop of great economic importance. Improving germination and initial vigor of seedlings can result in higher productivity and quality of the cotton produced. To achieve high productivity in most crops, mineral fertilizers are used, thus increasing production costs and environmental impacts. The use of Azospirillum brasilense can potentially increase resource use efficiency, leading to more robust and healthier crops. The objective of this study was to evaluate the ideal dose of the bacterium Azospirillum brasilense in the germination of cotton seeds of the cultivar TMG22 GLTP. The experiment was carried out in a completely randomized design (DIC), and the cotton cultivar used will be TMG22 GLTP. Sowing took place in Styrofoam trays with 2 seeds per cell. The substrate used consisted of coarse sand and Topstrato in a 1:1 ratio. The evaluations took place up to 7 days after the emergency. The variables analyzed were: seedling length and germination percentage.
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Albatnan, Sara, Hanane El Kaissoumi, Amina Ouazzani Touhami, and Allal Douira. "Investigating In Vitro Interactions and Saprophytic Activities Between Soil-Borne Phytopathogenic." In Advances in Bioinformatics and Biomedical Engineering. IGI Global, 2025. https://doi.org/10.4018/979-8-3693-9450-2.ch016.
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Furthermore, all pathogens significantly inhibited the spore's germination of each other, with Phytophthora sp. demonstrating the maximum inhibition against Fusarium oxysporum (99.99%), while Fusarium oxysporum exhibited the lowest inhibition (29.91%) against Phytophthora sp., as compared to the control. As the saprophytic activities tested in soil flasks, Fusarium oxysporum demonstrated high adaptability, surviving and thriving in the presence of Rhizoctonia solani across different combinations (25%,50%,75%). Fusarium's percentage of colonization reached 72.51%, significantly higher than Rhizoctonia's colonization, which ranged from 34.05% to 42.42%.Conversely, Verticillium dahliae displayed the lowest percentage of colonization (17.35% in front of Rhizoctonia solani in soil and 23% in front of Fusarium oxysporum in straw), indicating potential vulnerabilities.
Conference papers on the topic "Germination percentage"
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Sorokopudov, V. N. "MPACT OF ENVIRONMENT TEMPERATURE AND STRATIFICATION ON THE CITRUS AURANTIUM SEED GERMINATION." In Agrobiotechnology-2021. Publishing house RGAU-MSHA, 2021. http://dx.doi.org/10.26897/978-5-9675-1855-3-2021-110.
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This study is aimed at investigating the impact of the environment temperature and stratification on the Citrus aurantium seed germination. The results show that the optimum environment temperature for the seed germination is found to be 25°C with the maximum percentage of 90%. The stratification of seeds leads to the seed germination percentage decrease by 69% and germination speed increase by 7 days.
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Ramona, Stef, Ioana Grozea, Klaudia Kincel, Ana-Maria Virteiu, and Alin Carabet. "IMPACT OF TEMPERATURE AND SOWING DEPTH ON GERMINATION, GROWTH AND DEVELOPMENT OF THE INVASIVE SPECIES ASCLEPIAS SYRIACA." In 23rd SGEM International Multidisciplinary Scientific GeoConference 2023. STEF92 Technology, 2023. http://dx.doi.org/10.5593/sgem2023v/6.2/s25.31.
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Asclepias syriaca is a perennial species, native to North America. In Romania, being introduced as an ornamental species, in present being found in different habitats (agroecosystems) and on ever wider areas causing damage. Although the basic biological characteristics of Asclepias syriaca are known, its control is a significant problem. As a result, we hypothesized that temperature and sowing depth can be used to reduce the population of Asclepias syriaca. To test this, the seeds were put at 5?C, 27?C, room temperature, after which they were sown at a depth of 0.5 cm and 1 cm respectively, the responses regarding the germination and growth of Asclepias syriaca plants were studied in the laboratory. Following protocol was determined: the length of the roots, the height of the plants and the fresh weight. Asclepias syriaca seeds sown at 1cm depth showed a higher germination percentage compared to those sown at 0.5 cm. The seeds exposed at 27?C were the first to germinate exerting a higher height. Those subjected to the clipping method did not show a stimulation of the germination percentage and the roots and height showed the lowest values. At 5?C the germination percentage is reduced.
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Abouelezz, Ahmed Helmy Hassan, and Talaat Ahmed. "The Efficacy of Two Household Cleaning and Disinfecting Agents on Lentil (Lens culinaris Medik) and Faba bean (Vicia faba) Seed Germination." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2021. http://dx.doi.org/10.29117/quarfe.2021.0023.
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A germination test of Vicia faba and Lens culinaris seeds under the effect of bleach and vinegar was conducted for seven days, and the observations were recorded daily. The completely randomized design (CRD) was used to examine the germination with three replicates at the lab conditions. Six germination parameters were measured, including germination percentage (GP), germination index (GI), mean germination time (MGT), mean germination rate (MGR), vigour index (VI), plus the fresh weight (FW) and dry weight (DW) of Vicia faba and Lens culinaris seeds. As a legume crop seeds model, the efficacy of four treatment levels from 0.005% to 0.5% of bleach and vinegar on the germination was tested. A chemical analysis was performed using the ion chromatography (IC) to evaluate the effect of chloride and acetate anions up-take on the seedling germination in addition to other essential nutrients. A significant inhibition in seedling growth was observed with increasing the treatment concentration. The maximum inhibition was recorded for both seeds at 0.5%, followed by 0.1% levels, while a positive effect was represented with the lower concentrations. The chemical analysis of the up-taking active ingredients was corroborated by the germination outputs.
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Kanjevac, Milica, Biljana Bojović, Marija Todorović, Dragana Jakovljević, Jovana Momčilović, and Milan Stanković. "EFEKAT HORMOPRAJMINGA NA POBOLJŠANJE OTPORNOSTI KLIJANACA KUKURUZA NA USLOVE SLANOG STRESA." In XXVII savetovanje o biotehnologiji. University of Kragujevac, Faculty of Agronomy, 2022. http://dx.doi.org/10.46793/sbt27.449k.
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The paper examines the influence of different salicylic acid concentrations on germination percentage, dynamics and uniformity of germination, elongation and biomass of maize (Zea mays L.) seedlings in the early phase of growth and development, as well as the effect of hormopriming by salicylic acid on overcoming salt stress. According to the obtained results, the stimulating effect of salicylic acid on the germination and growth parameters of maize seedlings was confirmed, as well as its protective effect in conditions of salt stress. The concentrations of 10-4 and 10-5 M had the greatest effect on the examined parameters.
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AVEDISYaN, Sergey. "Comparison of Brassicaceae species by sowing qualities." In Multifunctional adaptive fodder production. Federal Williams Research Center of Forage Production and Agroecology, 2025. https://doi.org/10.33814/mak-2024-33-81-96-100.
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The data of comparing the seeds of Brassicaceae crops by sowing qualities obtained on the basis of the Federal Williams Research Center of Forage Production and Agroecology are presented. It has been established that all varieties of the studied cruciferous crops have good indicators of germination and growth strength. Samples of varieties of white mustard Aphrodite, oilseed radish Snezhana, spring mustard Nadezhda are superior in germination and growth strength to spring rapeseed varieties and their use implies more friendly and stable inputs. It is also worth noting that the Nadezhda sample, despite showing the lowest mass of 1000 seeds, had the highest percentage of germination, as well as high growth rates. Thus, it is impossible to directly link the weight of the seed and the indicators of germination and growth strength.
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Marijanović, Miloš, Ivana Živković, Slađan Adžić, et al. "THE IMPACT OF CLIMATE CHANGE ON PEPPER SEED QUALITY PARAMETERS DURING TWO YEARS." In 3rd International Symposium on Biotechnology. University of Kragujevac, Faculty of Agronomy in Čačak, 2025. https://doi.org/10.46793/sbt30.13mm.
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Pepper (Capsicum annuum L.) is a commercial crop grown worldwide. Seed quality, including seed health, is an important prerequisite for obtaining a healthy and high-quality crop and ensuring high fruit yields. Changes in the quality of the seeds of autochthonous varieties of pepper seeds: Palanačko Čudo, Somborka, and Dora were monitored from 2023 to 2024. Total germination was highest in the first observed year (2023). The Palanačko Čudo genotype had a total germination of 91%, which was statistically significantly different from Somborka (75%) and Dora (73%), respectively, between which there was no difference. The highest percentage of phytopathogenic fungus presence was detected in Palačanko čudo. While Fusarium spp. was not detected in the last observed year. A significant difference was observed in the overall germination rate in 2024, which was extreme in terms of temperatures, especially in the summer months.
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"Effect of Shelf life on Germination Percentage and Some Nutritional Value of Germinated Native Black Rice." In April 18-19, 2017 Kyoto (Japan). DiRPUB, 2017. http://dx.doi.org/10.15242/dirpub.dir0417224.
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Mohmmed SARHAN, Zina, Waleed Khalid AHMED, Somayyeh RAZZAGHI, and Shimal younis ABDUL-HADI. "EVALUATION BIOCONTROL OF TRICHODERMA SPP. AGAINST MACROPHOMINA PHASEOLINA ON SUNFLOWER." In V. International Scientific Congress of Pure, Applied and Technological Sciences. Rimar Academy, 2022. http://dx.doi.org/10.47832/minarcongress5-20.
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Sunflower disease Macrophomina phaseolina reduces yields by 35 percent in Iraq. The effectiveness of two species of Trichoderma against the disease was evaluated because there are no long-term control strategies and it is also difficult to eradicate it chemically. Using universal primer pairs, namely ITS, the Trichoderma species T.asperellum and T.longibrachitum molecular identities were verified. The results showed the highest reduction in the infection percentage and disease severity resulting in 21.07% and 0.18 compared to 74.65% and 0.74, in the presence of pathogen alone, respectively. and lead to an increase in seeds germination percentage, root and shoot dry weight were 93.55%,33.86, and 200.85 g, respectively, compared to 60.3%, 10.5 and 125.52 g, respectively, in the presence of pathogen alone, also increase in shoot and root heights were 127.3 and 14.8 cm respectively, compared to control 56.67 and 8.36cm, respectively.
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Jovković, Marina, Magdalena Knežević, Marina Dervišević, et al. "IMPROVING GERMINATION AND PROTECTION OF WHEAT SEEDS WITH NEW BACTERICAL ISOLATES FROM ALKALINE SOIL." In 3rd International Symposium on Biotechnology. University of Kragujevac, Faculty of Agronomy in Čačak, 2025. https://doi.org/10.46793/sbt30.39mj.
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The objective of this research is to investigate the application of new Bacillus spp. isolates from alkaline soil as potential biocontrol agents for the management of wheat pest-wireworms (A. lineatus larvae), diseases caused by the phytopathogenic fungi Fusarium spp., and their plant growth-promoting potential. Among five new Bacillus spp. isolates, BHC 1.3 and BHC 1.5 showed ability to suppress only mycelial growth of F. proliferatum. Insecticidal activity resulting in a wireworm mortality rate of 17.24% after ten days of experimentation was observed for BHC 1.5. The final percentage of seed germination was in the range of 95% – 100% with the additional highest production of indole-3-acetic acid (IAA) by BHC 1.5. The results of this study indicate that the new Bacillus spp. isolate may have the potential for formulating microbial inoculants effective in promoting wheat plant growth and biocontrol of soil-borne diseases and pests.
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Caus, Maria, and Pantelimon Borozan. "Evaluation of the resistance of different maize hybrids to negative temperature stress during seed germination." In Conferința științifică națională cu participare internațională "Integrare prin cercetare și inovare", dedicată Zilei Internaționale a Științei pentru Pace și Dezvoltare. Moldova State University, 2025. https://doi.org/10.59295/spd2024n.01.
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The main objective of the study was to determine the constitutive resistance of 14maize hybrids to negative temperature stress. To achieve the proposed objective, the seeds of the experimental variants were exposed to hypothermic stress, being incubated at negative temperature of -4C for 16 hours in the climatic chamber RUMED TYPE 3401 (RFG) with the accuracy of maintaining the temperature +/- 0.1ºC. At the same time, control seeds were incubated at a temperature of +4C. Then control and experimental seeds were germinated at an optimal temperature of +26C for 5 days, followed by determination of the final percentage of germination. Pretreatment of maize seeds with negative temperature stress made it possible to identify and evaluate the primary stress resistance of each hybrid. Depending on the degree of constitutive frost resistance of each hybrid, the distribution and classification of the studied hybrids into 3 groups was carried out, including hybrids with high, medium and low frost resistance.