Academic literature on the topic 'Seedling weight'
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Journal articles on the topic "Seedling weight"
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Elliott, R. H., L. W. Mann, and O. O. Olfert. "Effects of seed size and seed weight on seedling establishment, seedling vigour and tolerance of summer turnip rape (Brassica rapa) to flea beetles, Phyllotreta spp." Canadian Journal of Plant Science 87, no. 2 (2007): 385–93. http://dx.doi.org/10.4141/p06-166.
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A 3-yr study was conducted on three synthetic Brassica rapa L. cultivars to determine the effects of seed size and seed weight on seedling establishment, seedling growth and susceptibility to feeding damage by flea beetles, Phyllotreta spp. (Coleoptera: Chrysomelidae). Seed lots of AC Boreal, Fairview and Hysyn 110 were sieved to obtain small, medium and large seeds (1.4–1.6, 1.6–1.8 and 1.8–2.0 mm, respectively). In the laboratory, seedlings grown from large seeds had the largest cotyledons, highest shoot dry weight and highest biomass. Shoot weights increased as seed size increased. Sized seeds of the three cultivars were grown in the field without insecticides in 1998–2000. Seedlings of small seeds had the highest flea beetle damage and poorest seedling establishment. Shoot dry weight and biomass 14–35 d after planting increased as seed size and seed weight increased. Compared with small seeds, large seeds improved shoot dry weight, biomass and seed yield by 13–43, 25–57 and 12%, respectively. Results indicated that seedlings of medium and large seeds are more vigorous and tolerant to flea beetle damage than seedlings of small seeds. Tolerance was due to a higher initial seedling weight rather than higher relative growth rate. Shoot dry weights, biomass and yield of the three cultivars were more strongly correlated with 1000-seed weight than with seed diameter. Key words: Canola, flea beetles, seed size, seedling vigour, tolerance, seed weight
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Ekamawanti, Hanna Artuti, Lenawati Simanjuntak, and Abdurrani Muin. "Assessment of the Physical Quality of Eucalyptus pellita Seedlings from Shoot Cutting by Age Level." Jurnal Sylva Lestari 9, no. 2 (2021): 280. http://dx.doi.org/10.23960/jsl29280-290.
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The criteria for target seedling of Eucalyptus pellita F. Muell are at least 90days old, with consequences for the length of stay of the seedlings in the nursery. This study must assess the suitability as a target seedling first if it wants to plant the seedlings under 90days old in the field. The research aimed to evaluate and obtain the regression equation for the seedling’s age with the seedling’s morphological characters. The shoot seedlings cuttings aged 45, 60, 75, and 90 days after planting in the cocopeat growing medium were assessed. The study was used a survey method with a purposive sampling technique to obtain 60 samples by assessing the growth and appearances of the seedling. Furthermore, 15 samples were taken at random to determine the dry weight of the seedlings. Seedlings aged 75 and 90 days indicated the standard criteria as target seedlings for height, diameter, number of leaves, seedling’s health, shoot appearances, and seedling roots. The two seedlings’age levels have a sturdiness index of 8.34-9.78; shoot-root ratio 3.9-4.5; and seedling quality index (SQI) 0.22-0.23. Seedling age had a powerful positive correlation with the sturdiness index and SQI (r = 0.84 and r = 0.96). The regression equation of the sturdiness index is y = 0.048x + 5.435 (R2 = 0.996) and SQI is y = 0.004x - 0.064 (R2 = 0.926). This research implies that 75 and 90-days seedlings can be considered as one of the criteria for the age of E. pellita shoot cuttings as the target seedling in the SOP of PT. Finnantara Intiga.Keywords: cocopeat, Eucalyptus pellita, Seedling Quality index, shoot cuttings, target seedling
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Đokić, Dragoslav, Goran Todorović, Marijenka Tabaković, et al. "Influence of maize hybrids and seed size after processing on the physical characteristics of the seeds, germination and races growth." Journal on Processing and Energy in Agriculture 26, no. 3-4 (2022): 111–14. http://dx.doi.org/10.5937/jpea26-41639.
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In these studies, the physical and physiological seed properties and seedling's vigour properties in five ZP maize hybrids (ZP1, ZP2, ZP3, ZP4 and ZP5) were investigated. Hybrid seed was divided into small (SF) and large fractions (LF) The hybrid combination and seed size did not significantly (p ≥ 0.05) affect seed germination. Width, thickness, length, seed weight, dead seeds, abnormal seedling, stem and root growth and fresh seedling weight were significantly influenced by hybrid and seed fraction LF produced higher stems by 1.18 cm, longer roots by 2.94 cm and higher seedling weight by 0.032 g (the hybrid average) as compared to SF. The influence of hybrids on stem growth differed by 1.9 cm on SF seed and 1.7 cm on LF seed. Significant and positive dependence (p ≥ 0.001) between seed germination was determined with the growth of stem, root and seedling weight, as well as with the 1000 seed weight (p ≥ 0.01) and with a thickness (TS) (p ≥ 0.05). Seed germination with abnormal seedlings achieved a negative (p ≥ 0.01) significant correlation.
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South, David B. "Needle-Clipping Longleaf Pine and Top-Pruning Loblolly Pine in Bareroot Nurseries." Southern Journal of Applied Forestry 22, no. 4 (1998): 235–40. http://dx.doi.org/10.1093/sjaf/22.4.235.
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Abstract Studies have shown that clipping needles of longleaf pine before outplanting can increase average seedling survival by 13 percentage points. Under some situations, the increase in survival might be due to a reduction in transpiration. For loblolly pine, top-pruning in the nursery might increase average survival by 6 percentage points. Benefits of pruning appear greater when seedlings experience stress after planting and when nonpruned seedlings have low root weight ratios (root dry weight/total seedling dry weight). On some droughty sites, a seedling with a 0.3 root weight ratio might have an 80% chance of survival, while a seedling with a 0.2 root weight ratio might only have a 53% chance of survival. In most studies where heights were measured after 3 yr in the field, pruned seedlings were the same height as nonpruned seedlings (± 7 cm). South. J. Appl. For. 22(4):235-240.
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Concibido, Vergel C. "A SEED SELECTION SYSTEM FOR VIGOROUS TRUE POTATO SEEDS." HortScience 25, no. 4 (1990): 400f—400. http://dx.doi.org/10.21273/hortsci.25.4.400f.
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In developing countries, the use of True Potato Seed (TPS) technology offers some potential economic and biological advantages compared to using seed tubers. One problem with using TPS technology is the lack of seedling vigor, poor germination and non-uniformity of seedlings derived from TPS. Open-pollinated true seeds were divided into three classes based on differences in embryo morphology. Highly significant differences were observed among these seed classes for 100-seed weights, percent germination, rate of germination, 10-seedling weights and percent seedlings with leaves unfurled, ten days after sowing. Seed classes were quantified in terms of 100-seed weight with Seed class 1 having the lowest weight and Seed class 3 the highest; A significantly high r value (0.99) was obtained between seed classes and 10-seedling weight. High r values (0.93) and (0.94) were also obtained between seed classes and percent germination and percent seedlings with unfurled leaves, respectively. Results indicate that it may be possible to use these differences on embryo morphology as a basis for selecting vigorous true potato seeds.
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Dufault, Robert J. "Relationship among Nitrogen, Phosphorus, and Potassium Fertility Regimes on Celery Transplant Growth." HortScience 20, no. 6 (1985): 1104–6. http://dx.doi.org/10.21273/hortsci.20.6.1104.
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Abstract ‘Utah 52-70R’ celery (Apium graveolens L.) seedlings were fertilized weekly with solutions containing N, P, and Κ to determine the nutrient needs required to produce high quality transplants. As Ν rate increased from 10 to 250 ppm, shoot number, seedling diameter and height, leaf area/seedling, shoot and root dry weight/seedling, and dry weight/shoot increased in 52-day-old seedlings. As P rate increased from 5 to 125 ppm, seedling diameter, height, shoot dry weight/shoot, and leaf area increased, but root dry weight and shoot number were not affected. Nitrogen interacted with P for all growth variables measured. Increasing P rates from 5 to 125 ppm significantly increased shoot number, diameter, height, and shoot and root dry weights only in combination with Ν rates of at least 250 ppm; however, dry weight/shoot, leaf area, and root to shoot dry weight ratios increased with P rates used in conjunction with at least 50 ppm N. Potassium rates from 10 to 250 ppm affected neither the growth variables nor did they interact with P or N. Therefore, to grow high-quality celery transplants, nutrient solutions should contain at least 250N–125P–10K (ppm) if a ver-miculite-peat-perlite medium low in N, P, and Κ is used.
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Soplanit, A., M. K. Rumbarar, and P. Beding. "Effect of sucker weight and seedling site on the growth of sago seedlings (Metroxylon sago Rottb.) in Papua." IOP Conference Series: Earth and Environmental Science 924, no. 1 (2021): 012085. http://dx.doi.org/10.1088/1755-1315/924/1/012085.
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Abstract This study aims to obtain sucker weight and appropriate seedling site as a source of sago seeds by using seedling techniques in polybags to improve seed quality on sago cultivation. The experiment used a factorial design arranged in a randomized block design with three replications. Factor A, namely sucker weight, consisted of <999 g, 1000-1499 g, 1500-1999 g and > 2000 g. Factor B is the seedling site, consisting of laying seeds in the field, greenhouse and paranet of 60%. The results of the study showed that there was no interaction between the sucker weight combined with the seedling site, but the sucker weight had a significant effect on the number of rachis and the number of primary roots per plant and the percentage of life seedlings. Higher rachis growth was 3.8 obtained from medium-sized sucker weights (1000-1499 g and 1500-1999 g) and the highest number of primary roots was 41.3. It is obtained at sucker weights of 1000-1499 g. Meanwhile, the higher percentage of seedling survival was obtained at medium to large sucker weights of 66.3-71.0%. Thus, multiplication of sago seeds using medium-sized sucker on polybag media is highly suggested.
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Samuelson, Lisa J., and John R. Seiler. "Interactive Role of Elevated CO2, Nutrient Limitations, and Water Stress in the Growth Responses of Red Spruce Seedlings." Forest Science 39, no. 2 (1993): 348–58. http://dx.doi.org/10.1093/forestscience/39.2.348.
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Abstract Red spruce (Picea rubens Sarg.) seedlings were grown from seed for 5 mo in ambient (362 ppm) or elevated (711 ppm) CO2 to determine the potential effect of an increase in global CO2 concentration on seedling growth and establishment. CO2 exposure treatments were crossed with two levels of soil fertility and water stress treatments to determine if seedling dry weight, size, and fixed growth responses to elevated CO2 depended on nutrient and water supply. Seedling dry weight and size responses to elevated CO2 at 5 mo did not depend on nutrient and water supply. Seedlings grown in both soil fertility treatments and water stress treatments responded similarly to CO2 treatment. Water stress and CO2 treatments did have an interactive influence on the fixed growth potential of the terminal leader. Leaf weight, leaf area, and height of the terminal leader of water-stressed seedlings were greater in seedlings exposed to elevated CO2 during budset than seedlings exposed to ambient CO2. Total new fixed growth (lateral plus terminal) and total terminal fixed growth (leaf plus stem) were greater in seedlings that formed shoot primordia in elevated CO2 than in ambient CO2. Red spruce seedlings grown in elevated CO2 for 5 mo had greater stem diameter, height, branching density, leaf weight, root weight, stem weight, total weight, and mean relative growth rate (RGR) from 3 to 5 mo than seedlings grown in ambient CO2. Red spruce seedling responses to elevated CO2 suggest that seedling establishment in natural environments may be enhanced when ambient CO2 concentrations rise even if water and nutrient availabilities are limited. FOR. SCI. 39(2):348-358.
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Svenson, Sven E. "Shading and DCPTA Interactively Influence Shoot Growth of Hypoestes." HortScience 30, no. 4 (1995): 854D—854. http://dx.doi.org/10.21273/hortsci.30.4.854d.
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The objective of this study was to determine if shading and DCPTA application interactively influence seedling emergence and shoot growth of Hypoestes phyllostachya Bak. seedlings. Hypoestes `Carmine Red' seeds were soaked for 6 h in distilled water, and then soaked 6 h in solutions containing' 10 mg DCPTA/liter (30 mM) and 0.1% Tween-80, 0.1% Tween-80, or distilled water. Date of seedling emergence was recorded after sowing (0.5 cm) in 9-cm (460 ml) pots filled with 440 ml of a 5 pine bark: 4 Florida sedge peat: 1 sand medium. Forty pots from each of the three seed-soak treatments were grown under 30%, 63%, or 84% shading, provided by saran-type shadecloth, using natural photoperiods (completely randomized design). Shoot heights and dry weights were recorded 75 days after sowing. Neither shading nor DCPTA influenced total seedling emergence or seedling emergence rate (time to 50% emergence). Under 30% shading, seedlings from DCPTA-treated seeds were taller and had more shoot dry weight than seedlings from surfactant- or water-treated-seeds; however, DCPTA did not influence seedling height or shoot weight under 63% or 84% shading.
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Wurr, D. C. E., and Jane R. Fellows. "The influence of sowing depth and seed press wheel weighting on seedling emergence of crisp lettuce." Journal of Agricultural Science 104, no. 3 (1985): 631–36. http://dx.doi.org/10.1017/s0021859600044415.
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SummaryThe effects on emergence and growth of crisp lettuce seedlings as a result of sowing seeds at different depths and pressing them into the furrow bottom with a weighted seed press wheel were examined in three similar experiments in 1982, 1983 and 1984. Sowing depth had a considerable effect on percentage seedling emergence and the spread of emergence times but the pattern of response varied from year to year and appeared to be related to differences in soil moisture content. The most uniform emergence and the highest level of emergence were achieved by sowing shallowly (< 10 mm) with rainfall almost immediately after sowing then keeping the soil moisture content close to field capacity for 2 days. When rainfall or irrigation were delayed, drilling 15–20 mm deep gave more consistent results. Effects on seedling weight and variability of weight were associated with the time and uniformity of seedling emergence. Later emerging seedlings were lighter and a wide spread of emergence times gave seedlings of variable weight. There was virtually no effect on emergence of using additional weights on a seed press wheel.
Dissertations / Theses on the topic "Seedling weight"
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Furuya, Hideto. "Comparisons of seed weight and seedling characteristics of diploid and autotetraploid red clover." [Gainesville, Fla.] : University of Florida, 2001. http://etd.fcla.edu/etd/uf/2001/anp1600/fullmaster2.pdf.
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Almeida, JoÃo Paulo Nobre de. "Germination and seedling growth of amburana cearensis (AllemÃo) A.C. smith as a function the weight of seeds and abiotic factors." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=13207.
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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico<br>Given the needs of reclamation is increasing interest in the propagation of native species, which requires basic information about their germination characteristics and ecophysiological. The Amburana cearensis (AllemÃo) A.C. Smith known as cumaru is a species widely used for restoration of the landscape. The aim of this study was to investigate the germination and seedling growth of cumaru depending on the weight of the seeds under conditions of light, temperature, drought stress, as well as to determine the seed imbibition curve, internal morphology, chemical composition and quantification of the coumarin. Initially seeds were individually weighed and separated into three weight classes (light, medium and heavy), these being submitted to the determination of water content, thousand seeds weight and germination tests in two light conditions (presence and absence ) and six schemes temperatures (20, 25, 30, 35, 40, and 20-30 ÂC). In addition to these tests, it was determined the imbibition curve of each weight class and made assessment of drought stress tolerance under different potentials(-0.2, -0.4, -0.6, -0.8 and -1,0 MPa). The experiments were arranged in a completely randomized design in four replications for each treatment. For the internal morphology of seeds were used in cytochemistry usual techniques for the identification of the main structures and substances reserves. To visualize the coumarin in the seeds by NMR spectroscopy was used. The optimum conditions for seed germination occurred at 30 ÂC, which are insensitive to light and vigor seeds for light and medium. The best conditions for seedling growth occurred with the light and medium seeds at 25 and 30 ÂC and in the presence of light, with temperatures of 35 and 40 ÂC harmful. Light and medium seeds showed the same pattern of water absorption, while not reach the heavy phase III of the curve. The decrease in the water potential of the substrate affect the germination and growth of seedlings from seed medium and heavy compared to the light, and from -0.6 MPa in a condition strictly limiting seedling development. The chemical constituents present in the seeds of A. cearensis are quantitatively different depending on the weight of the seeds, and the heavy characterized by a high content of lipids. The NMR spectroscopy falls greater proportion of coumarin in seed extract heavy and medium, possibly affecting ecophysiological needs of the species A. cearensis.<br>Diante das necessidades de recuperaÃÃo de Ãreas degradadas à crescente o interesse na propagaÃÃo de espÃcies florestais nativas, o que demanda informaÃÃes bÃsicas sobre as suas caracterÃsticas germinativas e ecofisiolÃgicas. A Amburana cearensis (AllemÃo) A.C. Smith conhecida como cumaru à uma espÃcie bastante utilizada para recomposiÃÃo da paisagem. O objetivo deste trabalho foi estudar a germinaÃÃo e o crescimento de plÃntulas de cumaru em funÃÃo do peso das sementes sob diferentes condiÃÃes de temperatura, luz, estresse hÃdrico, bem como determinar nas sementes a curva de embebiÃÃo, morfologia interna, composiÃÃo quÃmica e identificaÃÃo da cumarina. Inicialmente as sementes foram pesadas individualmente e separadas em trÃs classes de peso (leves, mÃdias e pesadas), sendo estas, submetidas à determinaÃÃo dos teores de Ãgua, peso de mil de sementes e a testes de germinaÃÃo em duas condiÃÃes de luz (presenÃa e ausÃncia) e seis regimes de temperatura (20, 25, 30, 35, 40 e 20-30ÂC). AlÃm destes ensaios, foi determinado a curva de embebiÃÃo de cada classe de peso e avaliaÃÃo da tolerÃncia ao estresse hÃdrico sob diferentes potenciais (-0,2, -0,4, -0,6, -0,8 e -1,0 MPa). Os experimentos foram dispostos em delineamento inteiramente casualizado com quatro repetiÃÃes para cada tratamento. Para a morfologia interna das sementes foram utilizadas tÃcnicas usuais em citoquÃmica para a identificaÃÃo das principais estruturas e substÃncias de reservas. Para a visualizaÃÃo da cumarina nas sementes foi utilizada a espectroscopia por RMN. As condiÃÃes Ãtimas para a germinaÃÃo das sementes ocorreu na temperatura de 30ÂC, sendo estas insensÃveis à luz e um maior vigor para sementes leves e mÃdias. As melhores condiÃÃes para o crescimento das plÃntulas ocorreram com as sementes leves e mÃdias nas temperaturas de 25 e 30ÂC e na presenÃa de luz, sendo as temperaturas de 35 e 40 ÂC prejudiciais. Sementes leves e mÃdias apresentam o mesmo padrÃo de absorÃÃo de Ãgua, enquanto as pesadas nÃo atingem a fase III da curva. O decrÃscimo do potencial hÃdrico do substrato prejudica a germinaÃÃo e o crescimento de plÃntulas oriundas de sementes mÃdias e pesadas em comparaÃÃo Ãs leves, sendo a partir de -0,6 MPa uma condiÃÃo estritamente limitante na formaÃÃo de plÃntulas. Os constituintes quÃmicos presentes nas sementes de A. cearensis sÃo quantitativamente diferenciados em funÃÃo do peso das sementes, sendo as pesadas caracterizadas por um elevado teor de lipÃdios. A espectroscopia por RMN releva uma maior proporÃÃo de cumarina no extrato de sementes pesadas e mÃdias, que possivelmente afetam as necessidades ecofisiolÃgicas da espÃcie A. cearensis.
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Lessa, Bruno FranÃa da Trindade. "Germination and growth of seedling of Enterolobium contorsiliquum (Vell.) Morong depending on the weight of seed, location in fruit and conditions of temperature and light." Universidade Federal do CearÃ, 2013. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=9430.
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Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico<br>Currently comes increasing the interest with agronomical emphasis by native forest species from Brazil, due its applications in various sectors of the economy. The âtamborilâ (Enterolobium contorsiliquum (Vell.) Morong) is one of these species, presenting importance for the timber, landscape, medical, beekeeping sector, beyond to be indicated for recovery of degraded large areas. The objective of this work was studying the seeds germination and seedlings growth of E. contorsiliquum in function of seeds weight, location on fruit and conditions of temperature and light. Two experiments were conducted: in the first, the seeds were separated according to the weight, in three classes (light, intermediaries and heavy), submitting each class to germination test under absence and presence of light in four different temperatures (20, 30, 40 and 20-30ÂC). This experiment was disposed in triple factorial squeme 3x2x4 (related to three classes, two light regimes and four temperatures) under completely randomized design, with four replications. In the second, the seeds were separated according to their location in the fruit (proximal, central and distal regions) and submitted to germination test under the temperatures of 25 and 20-30ÂC, using factorial squeme 3x2 (three locations and two temperatures) in completely randomized design with four replications. For both experiments were determined the variables: germination first count, final percentage and rate, length and dry weight of shoot, root and total, beyond of accelerated aging only for the second experiment. All data were submitted to normality test and, when they were presented normal was performed variance analysis and the compare means by Tukey test, when no normal only Mann-Whitney test. The germination of âtamborilâ was shown to be insensitive to light with high percentage and rate when using the temperature of 40ÂC, however this temperature detracted the seedlings development. So the temperature more indicated for the settlement of âtamborilâ is 30ÂC. The heavy seeds had always the best results, showing the use of these seeds ensures seedlings production more uniform and with good development. Among the variables assessed the location of the seeds influenced only the germination rate, which was higher for seeds of the distal region of the fruit at 25ÂC. Conclude also the alternating temperature doesnât affect the seeds germination and seedlings growth of âtamborilâ.<br>Atualmente vem crescendo o interesse com cunho agronÃmico pelas espÃcies florestais nativas do Brasil, em virtude de suas aplicaÃÃes em diversos setores da economia. O tamboril (Enterolobium contorsiliquum (Vell.) Morong) à uma destas espÃcies, apresentando importÃncia para o setor madeireiro, paisagÃstico, medicinal, melÃfero, alÃm de ser indicada para recomposiÃÃo de Ãreas degradadas. O objetivo deste trabalho foi estudar a germinaÃÃo de sementes e o crescimento de plÃntulas de tamboril em funÃÃo do peso, localizaÃÃo das sementes no fruto e condiÃÃes de temperatura e luz. Foram realizados dois experimentos: no primeiro, as sementes foram separadas de acordo com o peso, em trÃs classes (leves, mÃdias e pesadas), submetendo-se, cada classe, ao teste de germinaÃÃo sob ausÃncia e presenÃa de luz em quatro diferentes temperaturas (20, 30, 40 e 20-30ÂC). Este experimento foi disposto em esquema fatorial triplo 3x2x4 (referentes a trÃs classes, dois regimes de luz e quatro temperaturas) sob delineamento inteiramente casualisado, com quatro repetiÃÃes. No segundo, as sementes foram separadas de acordo com sua localizaÃÃo no fruto (regiÃes proximal, central e distal) e submetidas ao teste de germinaÃÃo sob as temperaturas de 25 e 20-30ÂC, utilizando-se esquema fatorial 3x2 (trÃs locais e duas temperaturas) em delineamento inteiramente casualisado com quatro repetiÃÃes. Para ambos os experimentos foram determinadas as variÃveis: primeira contagem, porcentagem final e Ãndice de velocidade de germinaÃÃo, comprimento e massa seca da parte aÃrea, raiz e total das plÃntulas, alÃm do envelhecimento acelerado para o segundo experimento. Todos os dados foram submetidos a teste de normalidade e, quando estes apresentaram-se normais realizou-se anÃlise de variÃncia e a comparaÃÃo das mÃdias pelo teste de Tukey, quando nÃo normais apenas teste de Mann-Whitney. A germinaÃÃo de tamboril mostrou-se insensÃvel à luz com alta porcentagem e velocidade quando utilizou-se a temperatura de 40ÂC, todavia esta temperatura prejudicou o desenvolvimento das plÃntulas. Assim a temperatura mais indicada para o estabelecimento de tamboril à a de 30ÂC. As sementes pesadas obtiveram sempre os melhores resultados, mostrando que a utilizaÃÃo destas sementes garante produÃÃo de mudas mais uniforme e com bom desenvolvimento. Dentre as variÃveis avaliadas, a localizaÃÃo das sementes influenciou apenas a velocidade de germinaÃÃo, a qual foi maior para as sementes da regiÃo distal do fruto a 25ÂC. Conclui-se tambÃm que a alternÃncia de temperatura nÃo afeta a germinaÃÃo e crescimento das plÃntulas de tamboril.
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Holm, Stig-Olov. "Reproductive patterns of birches (Betula spp.) in northern Sweden." Doctoral thesis, Umeå universitet, 1994. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-96884.
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The aim of this thesis was to study patterns of reproduction of Betula pendula and B. pubescens coll. along an altitudinal, coastal-inland, gradient in northern Sweden. The altitudinal variation was related to the distribution of the birch taxa along the gradient. Six years field data showed a steep decrease of seed germinability of B. pendula towards its altitudinal range limit in the Scandes every year. In contrast, B. pubescens ssp. pubescens showed significant positive correlations between seed germinability and altitude in three of the six years. Furthermore, there was a highly significant positive correlation between seed weight and altitude for B. pubescens coll., but not for B. pendula. Production of viable seeds fluctuated strongly between years in most populations, except in marginal B. pendula populations in the mountain area where it was constantly very low. On average 15 - 41 % of the seeds produced in B. pendula populations above 400 m altitude were attacked by gall midges (Semudobia ssp.). Corresponding values for B. pendula populations below 400 m altitude were 4 - 7 %. In B. pubescens populations, the seeds attacked by Semudobia ssp. never exceeded 3 %. The high frequency of Semudobia attackes in high altitude marginal B. pendula populations was suggested to be due to limited resources for defense against the seed predator. A 3-yr study documented large variations in pollination and seed quality between taxa, high and low altitude populations, and between years. Empty seeds (without embryos) dominated among the sampled seeds in most cases. This proportion was decreased by pollen addition, in both B. pendula and B. pubescens, in mountain populations, but not in coastal populations. The high percentage of empty seeds was therefore suggested to be partly caused by pollen-limitation, but failure of pollen tube penetration - fertilisation, or maternal resource supply could also have had an influence. A laboratory experiment showed increased pollen germination and length of the longest pollen tube per style after increased pollination. The correlations between number and length of pollen tubes per style were however mostly low in natural populations, suggesting low probability of pollen competition in the natural situation. Sowing experiments indicated that differences in initial seedling density between B. pendula and B. pubescens was more affected by interspecific differences in seed quality than by interspecific differences in survival of seedlings after establishment A study of the age structure of a B. pendula stand, planted about 250 m above its natural altitudinal limit, indicated that this birch may reproduce above its recent range limit during temporally warmer periods. It was concluded that the level of accumulated resources in B. pendula in marginal sites in the Scandes would mostly be too low for completion of the reproductive cycle. In contrast, B. pubescens ssp. pubescens is able to accumulate enough rescources for reproduction also at relative high altitudes.<br><p>Diss. (sammanfattning) Umeå : Umeå universitet, 1994, härtill 5 uppsatser.</p><br>digitalisering@umu
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Moot, Derrick J. "Harvest index variability within and between field pea (Pisum sativum L.) crops." Lincoln University, 1993. http://hdl.handle.net/10182/1285.
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The association between individual plant performance and seed yield variability within and between field pea crops was investigated. In 1988/89 six F8 genotypes with morphologically distinct characteristics were selected from a yield evaluation trial. Analysis of the individual plant performance within these crops indicated an association between low seed yields and the location and dispersion of plant harvest index (PHI) and plant weight (PWT) distributions. The analyses also showed there was a strong linear relationship between the seed weight (SWT) and PWT of the individual plants within each crop, and that the smallest plants tended to have the lowest PHI values. A series of 20 simulations was used to formalize the relationships between SWT, PWT and PHI values within a crop into a principal axis model (PAM). The PAM was based on a principal axis which represented the linear relationship between SWT and PWT, and an ellipse which represented the scatter of data points around this line. When the principal axis passed through the origin, the PHI of a plant was independent of its PWT and the mean PHI was equal to the gradient of the axis. However, when the principal axis had a negative intercept then the PHI was dependent on PWT and a MPW was calculated. In 1989/90 four genotypes were sown at five plant populations, ranging from 9 to 400 plants m⁻². Significant seed and biological yield differences were detected among genotypes at 225 and 400 plants m⁻². The plasticity of yield components was highlighted, with significant genotype by environment interactions detected for each yield component. No relationship was found between results for yield components from spaced plants and those found at higher plant populations. The two highest yielding genotypes (CLU and SLU) showed either greater stability or higher genotypic means for PHI than genotypes CVN and SVU. Despite significant skewness and kurtosis in the SWT, PWT, and PHI distributions from the crops in this experiment, the assumptions of the PAM held. The lower seed yield and increased variability in PHI values for genotype CVN were explained by its higher MPW and the positioning of the ellipse closer to the PWT axis intercept than in other genotypes. For genotype SVU, the lower seed yield and mean PHI values were explained by a lower slope for the principal axis. Both low yielding genotypes were originally classified as having vigorous seedling growth and this characteristic may be detrimental to crop yields. A method for selection of field pea genotypes based on the PAM is proposed. This method enables the identification of weak competitors as single plants, which may have an advantage over vigorous plants when grown in a crop situation.
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Kuo, Hui-Fen, and 郭惠芬. "Effects of ethanol on soybean seedlings and qantitative estima- tion of soybean class I low-molecular-weight heat shock proteins induced by amino acid analogs." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/45727217210631509454.
Full textAbstract:
碩士<br>國立臺灣大學<br>植物學系<br>84<br>The stress response to ethanol and amino acid analogs in
soybean seedlings were examined in the study. Growth of 2-day-
old seedlings was inhibited proportionally to the concentration
of ethanol and duration of its treatment. The most susceptile
tissues of seedlings to ethanol were the elongation region of
primary roots as demonstrated by TTC reduction test. In
addition, the increasing leakage of electrolytes from seedlings
on exposure to ethanol indicated that ethanol might have a
great influence on membrane integrity. Seedlings developes
ethanol tolerance by a 2- hour heat shock (HS) pretreatment at
40℃, which were observed from the fact that there were great
improvements on the growth, tissue viability, and electrolyte
leakage of seedlilngs. This cross tolerance, however, was not
two-sided, i.e. a non-lethal ehtanol pretreatment did not
confer thermotolerance of seedlings. Analysis of the protein
synthesis pattern of seedlings treated with ethanol revealed
that many proteins with molecular weight higher than 50 kDa
were induced, whereas the class I low- molecular-weight heat
shock proteins (LMW HSPs) were not induced. A proline analog,
azetidine-2-carboxylic acid (Aze), was shown to induce most
HSPs synthesis in soybean. In this study we estimated the class
I LMW HSPs induced by azetidine quantitatively. Synthesis of
class I LMW HSPs increased along with the increasing
concentration of Aze and duration of treatment; during a
24-hour incubation with 10 mM Aze, class I LMW HSPs accumulated
to a level comparable to that of HS (40℃ for 2 hours). Another
amino acid analog, canavanine (an arginine analog; Can) did not
induce detectable synthesis of class I LMW HSPs, however,
combination of Aze and Can induced this class of HSPs
synergistically.
Books on the topic "Seedling weight"
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Orbea, Jorge Raul. Variation in Seed Weight and Seedling Growth in Perennial Species of the Genus Phalaris. Creative Media Partners, LLC, 2021.
Find full textBook chapters on the topic "Seedling weight"
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Das, Priyanka, Rajeev N. Bahuguna, Rohit Joshi, Sneh Lata Singla-Pareek, and Ashwani Pareek. "In search of mutants for gene discovery and functional genomics for multiple stress tolerance in rice." In Mutation breeding, genetic diversity and crop adaptation to climate change. CABI, 2021. http://dx.doi.org/10.1079/9781789249095.0045.
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Abstract Mutation breeding is a commanding tool, which has been adapted to generate altered genetic material to study functional genomics, including understanding the molecular basis of stress tolerance. Hitherto, several rice lines have been generated through mutagenesis and the mutated genes responsible for the 'gain of function' in terms of plant architecture, stress tolerance, disease resistance and grain quality have been characterized. Oryza sativa L. cv. IR64 is a high-yielding rice cultivar but sensitive to abiotic stresses such as acute temperatures, salinity and drought. In this study, a population of rice IR64 mutants was generated using gamma irradiation. The population was then subjected to a preliminary phenotypic screening under abiotic stresses such as heat and salinity at the seedling stage. On the basis of root length, shoot length, fresh weight, dry weight and chlorophyll measurements, we identified eight 'gain-of-function' mutant lines and used them for further biochemical and molecular characterization. Phenotyping results demonstrated that the identified mutant plants have gained the potential to thrive under heat and salinity conditions. This information would be of wide scientific interest and helpful for developing novel cultivars able to maintain yield in saline, hot and dry areas.
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Lantican, Gaudencia A. "Field Screening of Gamma-Irradiated Cavendish Bananas." In Efficient Screening Techniques to Identify Mutants with TR4 Resistance in Banana. Springer Berlin Heidelberg, 2022. http://dx.doi.org/10.1007/978-3-662-64915-2_7.
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AbstractIn our search for Cavendish bananas to withstand Fusarium oxysporum f. sp. cubense (Foc TR4) and other diseases, field screening of tissue-cultured Grand Nain banana seedlings derived from gamma-irradiated shoot tips was explored. Six months after irradiation and multiplication in the laboratory, the plantlets (M1V6) were individually grown in seedling bags under screen house conditions for 8 weeks, side-by-side with non-irradiated plantlets of the same clone. Once acclimatized, the banana plants were grown in an area confirmed positive of Foc TR4 (based on previous farm records stating that more than 50% of the plant population succumbed to the disease). Seedlings from each treatment (dose of radiation) were divided into four replicates, regardless of the number of plants. Each plant was given a unique identification code for traceability during disease monitoring, bunch and fruit quality evaluation.Incidences of Foc TR4, Moko disease (Ralstonia solanacearum) and virus diseases were monitored weekly. Plants found positive of any disease were eradicated immediately. The plant population for the succeeding generation was managed by removing the unwanted suckers, 12 weeks from planting using a spade gouge and keeping only one sucker per plant for the next generation. Agronomic characters of each plant were taken at the flowering stage. These included age to flower, height, pseudostem circumference, number of leaves and height of the sucker. The bunch was harvested 12 weeks from flowering. The number of hands in a bunch, the number of fingers and weight of a hand were recorded. The same agronomic characters of the plant were taken for the succeeding generations.Plants left standing in the field without any disease symptoms 3 years after planting were considered as putative mutants and were selected as candidate lines for multiplication and second-generation field screening. Only healthy suckers (free from viruses) were further multiplied via tissue culture technique to reach M1V6. Clean suckers from each line free of soil debris or dirt were sent to the laboratory for multiplication. At least 1000 plantlets were produced from each line for the second-generation field screening. These were grown in two locations – with and without records of Foc TR4. Field monitoring activities including plant population management, disease incidence assessment and fruit quality evaluation were carried out following the same protocols used in the establishment of the first-generation plants. Lines with population showing ≤10% Foc TR4 after the first harvest, with good vigor, fruit quality and productivity were considered as candidates for further multiplication, farmers distribution and field planting under semi-commercial scale.
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Key, Joe L., Yuh-Ru Julie Lee, Virginia Goekjian, and Ronald T. Nagao. "The Low Molecular Weight Heat Shock Proteins of Soybean Seedlings." In Biochemical and Cellular Mechanisms of Stress Tolerance in Plants. Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-79133-8_6.
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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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El Rhoch, Mohamed, Soukaina Maazouzi, Najoua Mouden, et al. "Trichoderma Use as Seed Treatment for Promoting the Growth of Young Argan Seedlings." In Obstacles Facing Hydrogen Green Systems and Green Energy. IGI Global, 2025. https://doi.org/10.4018/979-8-3693-8980-5.ch031.
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Seed treatment with Trichoderma spp. has shown to enhance plant growth and alleviate abiotic stress, but its application on endemic species, such as argan (Argania spinosa), remains underexplored. This study investigates the effect of a Trichoderma spp. bioformulation on argan seedling growth under greenhouse conditions over 12 months. Significant improvements were observed in treated seedlings, including increased length, dry matter of both root and shoot, and branch number. Root and vegetative fresh weights reached 12 g and 14 g, respectively, compared to 2 g and 3 g in control plants. Additionally, root and vegetative lengths were 44 cm and 74 cm, respectively, outperforming control seedlings at 35 cm and 25 cm. Treated seedlings also showed a higher number of branches and crown diameter, with survival and colonization rates of Trichoderma spp. in root tissues reaching 95%. These results suggest that Trichoderma spp. seed treatment can significantly promote the growth and development of young argan seedlings.
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Nunes, Henriqueta da Conceição Brito, Luiz Fernandes Silva Dionisio, Manoel Tavares de Paula, et al. "GROWTH ANALYSIS IN PRE-GERMINATED AÇAÍ TREE SEEDLINGS (Euterpe oleracea Mart. - Arecaceae) - CULTIVAR CHUMBINHO." In From Knowledge to Innovation: The Multidisciplinary Journey. Seven Editora, 2025. https://doi.org/10.56238/sevened2025.001-007.
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The açaí palm ( Euterpe oleracea Mart.) is a palm tree native to the Amazon floodplains, with increasing relevance in the national and international market, which has generated greater interest in its cultivation. Currently, the extractive exploitation of the açaí palm has been partially replaced by agricultural crops on dry land, indicating the need for studies related to the species. In a seedbed of the Municipal Secretariat of Agriculture and Rural and Economic Development (SEMADRE) of Cametá-PA, the growth analysis of the species E. oleracea (chumbinho) was carried out using the following parameters: stem height, radicle length, wet weight, dry weight, moisture content and absolute growth rate (AGR). After the 45th day of sowing, four collections (treatments) of plants were carried out in the following periods: five (5), ten (10), fifteen (15) and twenty-five (25) days after emergence in seedbed. In each period, 30 plants/treatment (time) were randomly collected, with 10 seedlings per replicate. The samples were analyzed at Campus XVIII of the State University of Pará. The seedlings, without seeds, were measured, weighed and dried in an oven at 80°C for 24 to 36 hours, until they reached constant weight. Most of the seeds showed aerial emergence after 30 days, in the so-called stick stage, with height ranging from 2.5 to 7.7 cm. In the first treatment (5 days), the average values recorded were: radicle length of 5.43 cm, stem height of 5.81 cm, wet weight of 0.43 g and dry weight of 0.09 g. The ACR was 0.004 g.day⁻¹, indicating the average growth rate. Based on the stem length, adjusted by linear regression, the ideal time to transplant the seedlings into polyethylene bags was estimated at 75.58 days. These results contribute to optimizing the management of dry land cultivation.
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Archana, Preetam Verma, and Nalini Pandey. "Impact of Inadequate Concentration of Boron in Seed Storage Proteins Content in Oilseed Crops." In Grain and Seed Proteins Functionality. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.95873.
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For the estimation of Impact of inadequate concentration of boron in seed storage proteins content in oilseed crops, a sand culture experiment was designed and all the three crops i.e. soyabean, mustard and linseed were grown under sufficient and insufficient boron treatment till maturity. Seed germination and seed storage protein concentration was determined in seeds after the harvesting of crops. Earlier oilseed crops like soyabean, mustard and linseed are cultivated for oil production but at this time these crops are reliable source of protein also and are real asset for human dietary protein. The storage protein present in seeds varies from ~10% (in cereals) to 40% (in certain legumes and oilseeds) of dry weight. Seeds contain one or more groups of proteins that are present in high amounts and that serve to provide a store of amino acids and sulfur required during germination and seedling growth. Quality of seeds is driven by the total protein content present in the form of storage reserve in seeds. There are major four types of storage proteins known as- globulins (insoluble in water), albumins (soluble in water), prolamins (soluble in alcohol) and glutelins (soluble in dilute acid and alkaline medium). Globulins and albumins are the major storage seed proteins of legumes and oilseed crops whereas prolamins and glutelins are mostly found in cereal seeds. Functionally boron is crucial micronutrient for a considerable amount of agricultural yield. Seed reserves (proteins, carbohydrates, starch, lipids) of post harvested seeds are depended on the appropriate boron supply during cropping. Boron insufficiency in oilseed crops found to be an inhibitory factor for seed vigor and seed quality. So this chapter deals with the effect of boron deprivation on seed quality in terms of germination capacity and seed storage protein reserves in the post harvested seeds of soybean, mustard and linseed.
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Wohl, Ellen. "June: The Thin Green Line." In Saving the Dammed. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190943523.003.0009.
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June, when the snows come hurrying from the hills and the bridges often go, in the words of Emily Dickinson. In the beaver meadow, the snows are indeed hurrying from the surrounding hills. Every one of the 32 square miles of terrain upslope from the beaver meadow received many inches of snow over the course of the winter. Some of the snow sublimated back into the atmosphere. Some melted and infiltrated into the soil and fractured bedrock, recharging the groundwater that moves slowly downslope and into the meadow. A lot of the snow sat on the slopes, compacted by the weight of overlying snow into a dense, water-rich mass that now melts rapidly and hurries down to the valley bottoms. North St. Vrain Creek overflows into the beaver meadow, the water spilling over the banks and into the willow thickets in a rush. I can hear the roar of water in the main channel well before I can see it through the partially emerged leaves of the willows. Overhead is the cloudless sky of a summer morning. A bit of snow lingers at the top of the moraines. Grass nearly to my knees hides the treacherous footing of this quivering world that is terra non-firma. I am surrounded by the new growth of early summer, yet the rich scents of decay rise every time I sink into the muck. I walk with care, staggering occasionally, in this patchy, complex world that the beavers have created. I abruptly sink to mid-thigh in a muck-bottomed hole, releasing the scent of rotten eggs, but less than a yard away a small pocket of upland plants is establishing a roothold in a drier patch. A seedling spruce rises above ground junipers shedding yellow pollen dust and the meticulously sorted, tiny pebbles of a harvester ant mound. I extract my leg with difficulty and continue walking. As I walk around the margin of another small pond, the water shakes. Sometimes the bottom is firm in these little ponds, sometimes it’s mucky—I can’t tell simply by looking through the water.
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Chagas Junior, Aloisio Freitas, Albert Lennon Lima Martins, Lillian França Borges Chagas, et al. "Bacillus subtilis as a growth promoter of forest species seedlings." In UNITING KNOWLEDGE INTEGRATED SCIENTIFIC RESEARCH FOR GLOBAL DEVELOPMENT. Seven Editora, 2023. http://dx.doi.org/10.56238/uniknowindevolp-122.
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Native forest species have been employed for several purposes, such as the recovery of degraded areas, reforestation, and afforestation. The growth-promoting microorganisms are a viable alternative to producing native forest seedlings. The Bacillus subtilis is an alternative since it stands out by promoting plant growth through the solubilization of phosphate, production of phytohormones, and the availability of nutrients. The present work aimed to evaluate the influence of Bacillus subtilis in the initial growth of fava-tamboril (Enterolobium maximum), amarelão (Apuleia leiocarpa), and paricá (Schizolobium amazonicum) seedlings. Inoculations were made with two strains of Bacillus subtilis (Bs08, Bs10) and the commercial product based on Bacillus subtilis PANTA©, using 1 mL of the solution of each strain, and a control sample with water only, using a graduated pipette. An entirely randomized design with three treatments and eight repetitions was used. The variables analysed were plant height (PH), stem diameter (SD), root volume (RV), root dry weight (RDW), above-ground biomass weight (AGB), and Dickson quality index (DQI). In general, inoculation with Bacillus subtilis, with both strains evaluated and the commercial inoculant (PANTA ©), provided gains in biomass and in the DQI of plants at 30 and 60 days after emergence. Thus, the inoculation of Bacillus subtilis showed promising results as a growth promoter for paricá, fava-tamboril, and amarelão.
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Shanmugavelu, Mathipriya, and Ganesan Sevugaperumal. "Screening and Potential Uses of Contaminated Spent Mushroom (Pleurotus spp.)." In Emerging Contaminants. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.93863.
Full textAbstract:
The commercial production of mushrooms generates a co-product, a virtually inexhaustible supply of spent mushroom substrate (SMS). It represents an ideal growth medium for plants and plant disease suppressive quality. Here we discussed about the contaminated microbial flora of SMS, potential antifungal and plant growth promoting activities, the results of these findings were also discussed in relation to the usage of SMS as a potential product for organic farming. SMS contained moisture content 72%, EC 1.75 mmho.cm−1 and had pH of 6.1. The cellulose and hemicellulose content of paddy straw substrate were 30.25%, 23.18% and 15.31% dry weight respectively. Growth in terms of root and shoot weight of the seedlings of green gram, black gram, tomato and chili were significantly higher when grown in 60% SMS amended soil. Spent mushroom compost from Pleurotus eous used in this study harbored bacterial population including, Bacillus sp., Clostridium sp., Pseudomonas sp. and E. coli. Bacterial isolate B1 was identified as Bacillus sp., isolate B2 was identified as Clostridium sp., isolate B3 as Pseudomonas sp. and B4 as Escherichia coli. These bacterial strains showed significant antagonistic activity against soil borne pathogenic fungi viz., Fusarium sp., Alternaria sp., Phytophthora sp. and Aspergillus sp.
Conference papers on the topic "Seedling weight"
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Dong, Wenhao, Jing He, Chuandong Ji, Xiaoman Cao, and Xiaoya Zhang. "Study on Seeding Weight Detection Device of Rice Seedling Production Line." In 2024 IEEE 7th Information Technology, Networking, Electronic and Automation Control Conference (ITNEC). IEEE, 2024. http://dx.doi.org/10.1109/itnec60942.2024.10732919.
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Takashi Fukushima and Kunio Sato. "Lodging of Cabbage Seedling Due to Its Own Weight." In 2009 Reno, Nevada, June 21 - June 24, 2009. American Society of Agricultural and Biological Engineers, 2009. http://dx.doi.org/10.13031/2013.26969.
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Jovovic, Mirjana, Verica Prodanovic, Aleksandra Govedarica-Lucic, and Zoranka Malesevic. "EFFECT OF APPLAYING OF HUMIC ACID ON SEEDLING GROWTH OF TOMATO." In XXVII savetovanje o biotehnologiji. University of Kragujevac, Faculty of Agronomy, 2022. http://dx.doi.org/10.46793/sbt27.039j.
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This study was undertaken to determine the effects of humic acid on the growth seedling of two tomato cultivars CeylandoF1 and RallyF1, under greenhouse conditions. Treatment with „Humistar“ was started in the two-leaf stage of the plant. One level of humic acid of 20 ml l-1 was applied to the seedling growing media and each seedling of the species was treated every ten days until transplanting directly into the soil in greenhouse.The higest growth rate: leaf (weight), stem (diameter and weight) and root (weight and lenght) growth were optained in cultivar RallyF1 as compared to the control and leaf, stem and root weight compared to Ceylando F1 cultivar.General, the results showed that humic acid influenced better root development in both examined tomato cultivars.
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Li, Li-Hua, Kai-Lun Chung, Ling-Qi Jiang, Alok Kumar Sharma, and Ye-Shan Liu. "The Study of Light-weight YOLOv4 Model for Rice Seedling and Counting." In 2022 International Conference on Computer Applications Technology (CCAT). IEEE, 2022. http://dx.doi.org/10.1109/ccat56798.2022.00008.
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Momčilović, Jovana, Dragana Jakovljević, Milica Kanjevac, and Biljana Bojović. "FIZIOLOŠKE KARAKTERISTIKE RASTENJA PŠENICE (Triticum aestivum L.) U USLOVIMA IN VITRO." In XXVII savetovanje o biotehnologiji. University of Kragujevac, Faculty of Agronomy, 2022. http://dx.doi.org/10.46793/sbt27.503m.
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This study aimed to examine the effect of different media - Murashige Skoog (MS) and Gamborg (B5) on the growth and development of in vitro seedling cultures of wheat (Triticum aestivum L.). The effects were evaluated through the measurement of root and shoot length, fresh and dry mass, as well as through the determination of the concentration of photosynthetic pigments (chlorophyll a, chlorophyll b, and carotenoids). The obtained data indicate that MS has better effects on the growth and development of wheat seedlings, since longer shoot length, and better fresh weight were observed on seedlings from this type of media. Additionally, higher chlorophyll b concentration and lower carotenoid concentration were measured in wheat leaves grown on MS medium. It can be concluded that MS is more suitable for establishing the initial in vitro culture of wheat compared to the B5 medium.
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Luković, Kristina, Aleksandra Rakonjac, Vladimir Perišić, Kristina Markeljić, and Slađan Adžić. "THE INFLUENCE OF ARTIFICIAL ILLUMINATION AND TILLAGE TREATMENTS ON ENHANCING LETTUCE GROWTH AND QUALITY." In 3rd International Symposium on Biotechnology. University of Kragujevac, Faculty of Agronomy in Čačak, 2025. https://doi.org/10.46793/sbt30.16kl.
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Lettuce (Lactuca sativa L.) indoor cultivation during the winter is mainly influenced by low light intensities. Also, its production is significantly affected by tillage techniques. Therefore, our research aimed to investigate the impact of applied light treatments during the seedling stage and applied tillage treatments after plant transplanting on the Viola lettuce genotype. Applied light and tillage treatments significantly influenced shoot weight, while the root weight and the total chlorophyll content varied depending on the light treatment. Tillage treatment did not affect shoot weight and the total chlorophyll content, but significantly influenced soluble sugar content.
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Luković, Kristina, Nenad Đurić, Ivan Tupajić, et al. "ARTIFICIAL LIGHTING AS AN EFFECTIVE METHOD FOR INCREASING LETTUCE SEEDLING DEVELOPMENT." In 3rd International Symposium on Biotechnology. University of Kragujevac, Faculty of Agronomy in Čačak, 2025. https://doi.org/10.46793/sbt30.14kl.
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Due to the short duration of sunlight and low light intensity during the winter, the lettuce photosynthesis is limited, resulting in slow growth and reduced quality. This study aimed to investigate the effects of light- emmiting diodes (LEDs) on the growth and quality of three lettuce cultivar seedlings. Results of our research indicate that applied light treatments significantly influenced the growth and development of all three lettuce cultivar seedlings. The highest shoot and root weight was achieved in the Jukebox cultivar grown under blue LEDs, while the highest total chlorophyll and carotenoid content was achieved in the Viola cultivar grown under white and blue LEDs, respectively.
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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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Milošević, Nebojša, Ivana Glišić, Milena Đorđević, Sanja Radičević, and Slađana Marić. "UTICAJ NOVIH VEGETATIVNIH PODLOGA NA BUJNOST, PRINOS I POMOLOŠKE OSOBINE SORTI ŠLJIVE „ČAČANSKA LEPOTICA“ I „JOJO“." In XXVII savetovanje o biotehnologiji. University of Kragujevac, Faculty of Agronomy, 2022. http://dx.doi.org/10.46793/sbt27.161m.
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Despite numerous deficiencies, the Myrobalan seedling is the most common plum rootstock in the Republic of Serbia. Although a large number of vegetative rootstocks exists worldvide, they are generally not available to producers in our country. In this work, we investigae the influence of four vegetative rootstocks: ʻWavitʼ, ʻWeivaʼ, ʻDoceraʼ and ʻDospinaʼ (last two are hypersensitive to Sharka virus) on tree vigour, yield and pomological properties of two plum cultivars ʻJojoʼ and ʻC ačanska Lepoticaʼ. All rootstocks differently affected examined properties. The largest tree vigour in both cultivars was caused by ‘Weiva’, while the smallest tree vigour of ‘Čačanska Lepotica’ was affected by ‘Docera’ and ‘Wavit’, as well as by ‘Dospina’ in ‘Jojo’. The highest yield was induced by ‘Weiva’, and smallest by ‘Docera’ and ‘Wavit’. Rootstocks ‘Weiva’ and ‘Wavit’ showed the largest influence on fruit weight while ‘Dospina’ and ‘Wavit’ affected morphometric properties the most. In terms of cultivars, ‘Jojo’ had largest tree vigour, yield, fruit weight and morphometric properties compared to ‘Čačanska Lepotica’.
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Abass Hussein, Haifaa. "Studying the effect of some natural materials on the germination and growth of chickpea plant (cricer arietinum L.)." In X INTERNATIONAL CONGRESS OF PURE AND APPLIED TECHNOLOGICAL SCIENCES. Rimar Academy, 2023. http://dx.doi.org/10.47832/minarcongress10-4.
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A laboratory experiment was carried out in one of the laboratories of the horticulture department, college of agriculture, Al-qadisiya university, during the spring season of the year 2023, with the aim using environmentally friendly natural materials instead of chemical fertilizers and studying their effect as fertilizer for chickpea plant (cricer arietinum L). Acomplete randomized design (CRD) was used with three replications and one factors, as the treatments included (T1 control distilled water, T2 banana peels fertilizer, T3 eggs shell fertilizer and T4 mixture of two fertilizers. Results showed that the treatment of the plant with mixture natural fertilizer gave agood result compared to the control treatment 100% ,while it gave the lowest germination rate when the control treatment 91.6 % without significant differences.The results were also the highest in the number of branching of the root of the seedling and in the same treatment 18.6 branch ,while the comparison treatment gave the lowest number of branch and reached 14.3 branch without significant differences .the length of the root stock and feather ,its dry weight and the strength of the seedling also had the highest rates when theT4 treatment reached 12.1 cm ,4cm ,0.299 mg .0.322 mg and 1.7000 respectively ,with significant differnces ,while the rates were lower when the control (T1 treatment )the comparison an ounted to 5.5 cm ,2.3 cm 0.142 mg 0.133 mg and 726.0 resectively
Reports on the topic "Seedling weight"
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VanderGheynst, Jean, Michael Raviv, Jim Stapleton, and Dror Minz. Effect of Combined Solarization and in Solum Compost Decomposition on Soil Health. United States Department of Agriculture, 2013. http://dx.doi.org/10.32747/2013.7594388.bard.
Full textAbstract:
In soil solarization, moist soil is covered with a transparent plastic film, resulting in passive solar heating which inactivates soil-borne pathogen/weed propagules. Although solarization is an effective alternative to soil fumigation and chemical pesticide application, it is not widely used due to its long duration, which coincides with the growing season of some crops, thereby causing a loss of income. The basis of this project was that solarization of amended soil would be utilized more widely if growers could adopt the practice without losing production. In this research we examined three factors expected to contribute to greater utilization of solarization: 1) investigation of techniques that increase soil temperature, thereby reducing the time required for solarization; 2) development and validation of predictive soil heating models to enable informed decisions regarding soil and solarization management that accommodate the crop production cycle, and 3) elucidation of the contributions of microbial activity and microbial community structure to soil heating during solarization. Laboratory studies and a field trial were performed to determine heat generation in soil amended with compost during solarization. Respiration was measured in amended soil samples prior to and following solarization as a function of soil depth. Additionally, phytotoxicity was estimated through measurement of germination and early growth of lettuce seedlings in greenhouse assays, and samples were subjected to 16S ribosomal RNA gene sequencing to characterize microbial communities. Amendment of soil with 10% (g/g) compost containing 16.9 mg CO2/g dry weight organic carbon resulted in soil temperatures that were 2oC to 4oC higher than soil alone. Approximately 85% of total organic carbon within the amended soil was exhausted during 22 days of solarization. There was no significant difference in residual respiration with soil depth down to 17.4 cm. Although freshly amended soil proved highly inhibitory to lettuce seed germination and seedling growth, phytotoxicity was not detected in solarized amended soil after 22 days of field solarization. The sequencing data obtained from field samples revealed similar microbial species richness and evenness in both solarized amended and non-amended soil. However, amendment led to enrichment of a community different from that of non-amended soil after solarization. Moreover, community structure varied by soil depth in solarized soil. Coupled with temperature data from soil during solarization, community data highlighted how thermal gradients in soil influence community structure and indicated microorganisms that may contribute to increased soil heating during solarization. Reliable predictive tools are necessary to characterize the solarization process and to minimize the opportunity cost incurred by farmers due to growing season abbreviation, however, current models do not accurately predict temperatures for soils with internal heat generation associated with the microbial breakdown of the soil amendment. To address the need for a more robust model, a first-order source term was developed to model the internal heat source during amended soil solarization. This source term was then incorporated into an existing “soil only” model and validated against data collected from amended soil field trials. The expanded model outperformed both the existing stable-soil model and a constant source term model, predicting daily peak temperatures to within 0.1°C during the critical first week of solarization. Overall the results suggest that amendment of soil with compost prior to solarization may be of value in agricultural soil disinfestations operations, however additional work is needed to determine the effects of soil type and organic matter source on efficacy. Furthermore, models can be developed to predict soil temperature during solarization, however, additional work is needed to couple heat transfer models with pathogen and weed inactivation models to better estimate solarization duration necessary for disinfestation.