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Academic literature on the topic 'Seedling stress'

Author: Grafiati

Published: 4 June 2021

Last updated: 10 February 2022

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Journal articles on the topic "Seedling stress"

Aizen, Marcelo A., and Hilary Woodcock. "Effects of acorn size on seedling survival and growth in Quercus rubra following simulated spring freeze." Canadian Journal of Botany 74, no. 2 (1996): 308–14. http://dx.doi.org/10.1139/b96-037.

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Seed size is an important phenotypic trait commonly associated with the fitness of young seedlings exposed to environmental stress. Spring frosts can cause leaf necrosis and seedling mortality in young oak seedlings, and seedling mortality following spring freeze events is a factor limiting the northern range limits of Quercus gambelii (Nutt.). We examined the relationship between acorn size and seedling survival following spring freeze by exposing 1-month-old Quercus rubra (L.) seedlings from two sites in Massachusetts to −3 °C for 8 h. Mortality of 1-month-old frost-exposed seedlings (20–25%) was 10 times higher than control mortality, with survival directly related to acorn size. Seedling size at the end of the first growing season was negatively affected by frost exposure and positively associated with acorn size. Overwintering mortality (<5%) was negatively associated with seedling size. The production of large acorns should confer a selective advantage in habitats susceptible to spring frosts through a positive effect on seedling establishment success under stress. Keywords: red oak, acorn size, frost, seedling survival.

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Flasiński, Stanisław, Janina Rogozińska, and Lucyna Drozdowska. "The effect of phosphours and water deficit on phosphatase activity and proline accumulation in seedling cotyledons and roots of oilseed rape as compared to that of excised cotyledons and roots." Acta Societatis Botanicorum Poloniae 55, no. 1 (2014): 83–96. http://dx.doi.org/10.5586/asbp.1986.010.

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Oilseed rape seedlings and excised cotyledons and roots were exposed to phosphorus and osmotic stress (-1 MPa: NaCl or PEG). The stress factors limited the growth of the seedlings and inhibited the growth of the excised roots and cotyledons. The phosphorus content in the cotyledons and roots depended on its level in the media and on the stress factors used. Phosphorus deficiency differentiated total phosphatase activity in seedling cotyledons and increased the activity in the excised cotyledons. In the excised and seedling roots, the lack of phosphorus, its deficiency and stress imposed by the addition of NaCl, caused an increase in total and specific phosphatase activity. Osmotic stress caused proline accumulation in both the seedling and excised cotyledons, but the effect of phosphorus stress was much smaller. Proline increase in seedling roots followed only after the osmotic stress caused by NaCl. The proline content in the excised roots was low. Stress factors lowered the protein content in the seedling and excised cotyledons. In both seedling and excised roots, the lowering of the protein content occurred mainly in response to osmotic stress. Kinetin modified metabolic responses in seedling cotyledons and roots. The use of in vitro culture allowed the elucidation of the tested responses. In excised cotyledons grown under stress conditions, kinetin increased the phosphorus and protein contents and lowered proline accumulation, suggesting that kinetin had the ability to overcome phosphorus and osmotic stress. The excised oilseed rape roots responded only slightly to kinetin (Drozdowska and Rogozińska 1984) and its effect was much smaller.

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Jia, Kai, Cunyao Yan, Huizhuan Yan, and Jie Gao. "Physiological Responses of Turnip (Brassica rapa L. subsp. rapa) Seedlings to Salt Stress." HortScience 55, no. 10 (2020): 1567–74. http://dx.doi.org/10.21273/hortsci15187-20.

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Turnip (Brassica rapa L. subsp. rapa) is a type of root vegetable belonging to the Brassica subspecies of Cruciferae. Salt stress is one of the main abiotic stresses that causes water deficit, ion toxicity, and metabolic imbalance in plants, seriously limiting plant growth and crop yield. Two commercial turnip cultivars, Wenzhoupancai and Qiamagu, were used to evaluate the seed germination and physiological responses of turnip seedlings to salt stress. NaCl was used to simulate salt stress. Parameters of seed germination, seedling growth, osmoregulation substances content, chlorophyll content, antioxidant enzyme activity, and other physiological parameters of turnip seedlings were measured after 7 days of salt stress. The results showed that salt stress reduced the seed germination rate, and that the seeds of ‘Wenzhoupancai’ were more sensitive to salt stress. Salt stress inhibited the growth of turnip seedlings. With the increased NaCl concentration, the seedling dry weight, seedling fresh weight, and seedling length of turnip decreased gradually. Under the salt stress treatment, the osmotic regulatory substances and antioxidant enzyme activity in the seedlings of turnip increased significantly. The chlorophyll content increased at a lower NaCl level, but it decreased when the level of NaCl was higher. Growth parameters of turnip seedlings had significant negative correlations with the reactive oxygen content, osmoregulation substances, and antioxidant enzyme activities, but they had positive correlations with chlorophyll b and total chlorophyll content. These results indicated that salt stress-induced oxidative stress in turnip is mainly counteracted by enzymatic defense systems.

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Matusick, G., L. G. Eckhardt, and S. A. Enebak. "Virulence of Leptographium serpens on Longleaf Pine Seedlings Under Varying Soil Moisture Regimes." Plant Disease 92, no. 11 (2008): 1574–76. http://dx.doi.org/10.1094/pdis-92-11-1574.

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Recently, Leptographium serpens has been recovered from the roots of declining and dead longleaf pine (Pinus palustris) in stands associated with various abiotic stresses. Although most data suggest that L. serpens is pathogenic to various Pinus spp., there is little known of its virulence on longleaf pine or its relationship with abiotic stress in causing disease. These trials examined the effects of L. serpens infection coupled with drought stress. Trials began with wound inoculations of bareroot longleaf pine seedlings in spring 2006 and 2007 at the seedling stress facility at Auburn University. Soon after inoculation, seedlings were also subjected to adequate moisture, moderate drought, or severe drought. Sixteen weeks after inoculation, longleaf pine survival, L. serpens virulence, and seedling growth characteristics were measured. Longleaf pine seedlings inoculated with L. serpens had 33% mortality (138/420) which was significantly greater than nonwounded control seedlings (22%, 47/211). Survival and lesion size on longleaf pine suggests that L. serpens is moderately pathogenic to longleaf pine seedlings. Separately, moisture stress associated with low soil moisture also contributed to seedling mortality. Results suggest that L. serpens infection and moisture stress commonly experienced by southern pines act independently to stress longleaf pine.

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Anuradha, S., and S. S. R. Rao. "The effect of brassinosteroids on radish (Raphanus sativus L.) seedlings growing under cadmium stress." Plant, Soil and Environment 53, No. 11 (2008): 465–72. http://dx.doi.org/10.17221/2307-pse.

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The effect of 24-epibrassinolide and 28-homobrassinolide on seed germination and seedling growth of radish (Raphanus sativus L.) was studied under cadmium toxicity. The impact of brassinosteroids (BRs) on free proline levels and the activity of antioxidant enzymes catalase (CAT; EC 1.11.1.6), peroxidase (POD; EC 1.11.1.7), superoxide dismutase (SOD; EC 1.15.1.1), ascorbic peroxidase (APOX; EC 1.11.1.11) and guaiacol peroxidase (GPX; EC 1.11.1.7) in radish seedlings under Cd toxicity was evaluated. The effect of BRs on the activity of ascorbic acid oxidase (AAO; EC 1.10.3.3) and lipid peroxidation in radish seedlings challenged with Cd stress was also investigated. BRs supplementation alleviated the toxic effect of the heavy metal and increased the percentage of seed germination and seedling growth. Out of the two substances, HBL was found to be more effective than EBL in stress alleviation. HBL (3&micro;M) alleviated the toxic effect of the heavy metal and increased the percentage of seed germination by 57% over Cd and 20% over unstressed control. Similarly supplementation of HBL (3&micro;M) caused an increase of 156%, 78% and 91% in length, fresh weight and dry weight of seedling, respectively, over Cd treatment alone. The amelioration of seedling growth by BRs under metal toxicity was associated with enhanced levels of free proline. The activities of antioxidant enzymes CAT, SOD, APOX and GPX were increased in the seedlings from treatments with Cd along with BRs. Brassinosteroid treatment reduced the activity of POD and AAO in heavy metal stressed seedlings. Lipid peroxidation induced by Cd was found reduced with the supplementation of BRs. The results obtained in the study clearly indicated the ameliorative influence of brassinosteroids on the inhibitory effect of Cd toxicity.

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Ye, Long Hua, Qiu Jing Li, Li Xue, Gan Wen Lie, Xiao Li Hou, and Hong Yue Chen. "Effects of Ozone and Drought on Physiological Characteristics of Three Seedling Types in South China." Applied Mechanics and Materials 522-524 (February 2014): 1089–97. http://dx.doi.org/10.4028/www.scientific.net/amm.522-524.1089.

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Seedlings of Michelia macclurei, Cinnamomum camphora and Rhodoleiachampionii were placed in open-top chambers (OTC) with two ozonic treatments including E40 (nature air, 40 ppb) and E150 (150 ppb) and two water treatments. Physiological indexes such as chlorophyll, soluble sugar, soluble protein, proline, MDA and SOD of three seedling types were evaluated. With increasing experimental time, chlorophyll content generally decreased or remained steady, soluble sugar content increased followed by a decrease and SOD activity increased for the three seedling types in ozone treatment, drought treatment or ozone-drought intercross treatment. Contents of soluble protein and proline increased for the three seedling types in ozone treatment and drought treatment. The MDA content increased for M. macclurei and C. camphora in ozone treatment and drought treatment and for R. championii in the three stress treatments. Principal component analysis indicated that the resistance abilities of ozone, drought or intercross stress for the three seedling types was C. camphora seedlings > M. macclurei seedlings > R. championii seedlings.

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Armitage, Allan M. "MINIMIZING ENVIRONMENTAL STRESS IN BEDDING PLANT AND GREENHOUSE PRODUCTION." HortScience 25, no. 9 (1990): 1179c—1179. http://dx.doi.org/10.21273/hortsci.25.9.1179c.

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Minimizing environmental stress in bedding plant and greenhouse and seedling development has occupied many researchers in academia and industry for many years. The dependence on single plant germination units (plugs) for bedding plant production and high value hybrid seed demand high rates of germination and successful seedling establishment. Pre-germinating or priming of seed is an important method of germination enhancement and methods and benefits of “priming” will be discussed. Environmental options to enhance seed germination of non-primed seed include control of vapor pressure deficit (VPD) and temperature.Enhancement of seedling establishment through growth room and greenhouse technology includes the optimal use of CO2, temperature and light. Carbon dioxide fertilization on seedlings is receiving serious study and will be further elucidated.

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Cobb, B. G., D. L. Andrews, D. M. MacAlpine, J. R. Johnson, and M. C. Drew. "1001 ANOXIA TOLERANCE OF MAIZE SEEDLING ROOTS." HortScience 29, no. 5 (1994): 573a—573. http://dx.doi.org/10.21273/hortsci.29.5.573a.

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We have been examining the response of maize seedling roots to oxygen stress. Previously, we have shown that maize seedlings with primary root lengths of 10cm or greater require a pretreatment with low oxygen (hypoxia) for survival of greater than 12 hours of anoxia. During the pretreatment there is induction of mRNA and increase in enzymatic activity of alcohol dehydrogenase (ADH) and other enzymes that are necessary for alcoholic fermentation. However, we have found that younger seedlings do not need a pretreatment to survive anoxia. They appear to have high levels of ADH and other enzymes that are needed for anaerobic survival at levels equivalent to those that are induced in older seedlings. These results suggest that, at the time of seedling emergence, seedlings may be more adapted to oxygen stress than during later stages of growth.

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Battaglia, M., and JB Reid. "The Effect of Microsite Variation on Seed-Germination and Seedling Survival of Eucalyptus delegatensis." Australian Journal of Botany 41, no. 2 (1993): 169. http://dx.doi.org/10.1071/bt9930169.

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The correlation between microsite and seedling numbers was determined in field sowings, and the impact of microsites on germination and seedling survival tested in artificial seedbeds in the glasshouse. Small scale variation in soil conditions, at the scale of tens of centimetres, markedly affected the germination and establishment of Eucalyptus delegatensis R.T.Baker seeds and seedlings. Under conditions of limiting soil moisture, microsites that afforded protection, and probably resulted in increased humidity, caused a marked increase in germination number and rate. The mean survival time was significantly higher on these protected microsites than on less protected microsites, or on microsites that restricted root penetration. The importance of this variability in microtopography was strongly influenced by season and the level of environmental stress, and was diminished as seedlings aged. Due to the different requirements for seed germination and seedling growth, a favourable microsite for germination was not necessarily a favourable site for seedling survival. A comparison of seed and seedling responses to water stress indicated that for E. delegatensis, at least, selection due to microsite differences at the time of germination may not have an impact on the developmental characteristics of the seedlings.

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Singh, N. B., and Nimisha Amist. "Interactive Effects of Cinnamic Acid and Water Stress on Wheat Seedlings." INTERNATIONAL JOURNAL OF PLANT AND ENVIRONMENT 4, no. 01 (2018): 105–12. http://dx.doi.org/10.18811/ijpen.v4i01.11616.

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In the present study we compared the effects of allelochemical with water stress (WS) on growth, biochemical parameters and responses of antioxidative enzymes in wheat seedlings. The wheat seedlings were treated with 0.5, 1.0 and 1.5 mM concentrations of cinnamic acid (CA) with and without water stress by withholding water supply for 5 days. Leaf water status, photosynthetic pigments, protein content, amount of proline and nitrate reductase (NR) and antioxidant enzymes activities were examined. CA resulted in reduction of seedling height with drastic decrease in stressed seedlings. The combined treatments CA+WS further decreased the seedling height. The same result was registered for seedlings dry weight, relative water content and pigment and protein contents. Total soluble sugar content and nitrate reductase activity were variedly affected under all treatments. Proline content and lipid peroxidation increased. Activity of superoxide dismutase increased significantly (less than 0.05) while catalase P activity was lower in all treatments. Ascorbate peroxidase and guaiacol peroxidase activities were higher as compared with catalase which showed protection of wheat seedlings from oxidative stress. Water stress elevated the toxic effect of allelochemical.

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Dissertations / Theses on the topic "Seedling stress"

Peacock, Kenneth. "Growth, mechanical stress responses and mutation of sunflower seedling hypocotyls." Thesis, University of Aberdeen, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277289.

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The aims of this thesis were four-fold: 1. To characterise the patterns of growth underlying established nutations of etiolated sunflower seedling hypocotyls. 2. To characterise the growth patterns and events surrounding the initiation of nutation in etiolated sunflower seedling hypocotyls. 3. To investigate the effects of applied compression and tension forces on the straight growth of etiolated sunflower seedling hypocotyls. 4. To investigate the relationship between auxin and the responses to mechanical stress in etiolated sunflower seedling hypocotyls. Time-lapse video analysis showed that the growth of etiolated sunflower seedling hypocotyls was more dynamic than expected, with growth constantly changing. When growth rates were plotted against time, the resultant curves showed regular oscillations similar to those of the movement traces for nutation and it was apparent that the nutational movements were intimately linked to the patterns of growth. Such patterns of growth were also found prior to the onset of nutation but in that case the growth curves on opposite sides of the hypocotyl did not oscillate out of phase with each other until immediately before the start of nutation. It was also found that there was a threshold height below which nutations were never found. The roles of light and geotropic responses in the initiation of nutation were also investigated. It was found that light was not required for nutation to occur and that various types of geotropic stimulation failed to initiate nutation in seedlings below the threshold height, although such seedlings were capable of responding to a gravity stimulus. It was concluded that the initiation and maintenance of nutation is an endogenous process and that nutation is a result of the way in which seedling hypocotyls grow rather than a discrete phenomenon superimposed on `normal' growth. The application of compression forces increased the growth of etiolated sunflower seedling hypocotyls over that of the non-compressed controls while tension forces applied to the same material did not produce any significant change in growth rates. When compression forces were applied to seedlings immersed in 10-10 Molar auxin solution the increase in growth due to compression were larger than those found for seedlings compressed while immersed in distilled water. It was concluded that some mechanism for the reception of compression forces operates in this material possibly involving a change in the sensitivity of the epidermal cells to auxin. A model was proposed in which growth is controlled by the mechanical forces acting on individual cells. It is suggested that nutation arises from the responses of cells and groups of cells to such mechanical strains.

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Myers, Jonathan Andrew. "Seedling carbohydrate storage, survival, and stress tolerance in a neotropical forest." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0009262.

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Ye, Nenghui. "Stress perception and ABA signaling in rice seed germination and seedling establishment." HKBU Institutional Repository, 2011. https://repository.hkbu.edu.hk/etd_ra/1305.

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Liu, Rui. "Regulation and molecular signaling during seed germination and seedling establishment of arabidopsis in response to abiotic stresses." HKBU Institutional Repository, 2013. https://repository.hkbu.edu.hk/etd_oa/101.

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Plants regulate many physiological processes in response to adverse environmental stresses. This study focused on the seed germination and seedling establishment stage and investigated the molecular signaling events when abiotic stresses, such as osmotic, water and temperature, were applied. Seeds of Arabidopsis, mutants or wild type, were used to identify the signaling components. Cold-pretreatment (stratification) is widely used to break seed dormancy and improve germination rate. Stratification at 4. significantly broke the seed dormancy of Arabidopsis in wild-type, cyp707a2, sleepy1 and sleepy1/cyp707a2, but not in ga3ox1. Stratification and exogenous ABA treatment strongly enhanced the expression and the activity of a-amylase in the freshly harvested seeds among the wild-type and those mutants, which have relatively high ABA content. Similarly, the expression of RGL2 and ABI5 were also substantially suppressed by stratification. These results suggest that stratification firstly leads to GA biosynthesis and unlocks the inhibition of RGL2 on the expression of a-amylase. Stratification also relieves the inhibition of ABA on the germination process but the inhibition of ABA on seedling development is not affected. We have isolated an Arabidopsis mutant, dsptp1, which is hyposensitive to osmotic stress during seed germination and seedling establishment, indicated by exhibiting higher seed germination rate, lower inhibition in root elongation under osmotic stress, and more tolerance to drought compared with the wild type (Col0) plants. Osmotic stress and drought enhanced AtDsPTP1 expression in seed coats, the bases of rosette leaves and roots. Compared with the wild type, the dsptp1 mutant increased proline accumulation, reduced MDA content and ion leakage, and enhanced antioxidant enzyme activity under osmotic stress. AtDsPTP1 regulated the transcript levels of various dehydration responsive genes, ABA biosynthesis and metabolic enzyme gene under osmotic stress, resulting in reduced accumulation of ABA in dsptp1 mutant plants than wild type in response to osmotic stress. AtDsPTP1 also mediated the ABA signaling pathway under osmotic stress by suppressing the expression of ABI1 and enhancing the expression of the positive regulators ABI3 and ABI5 in ABA signaling. These data suggest that AtDsPTP1 positively regulates ABA accumulation and signaling during seed germination and seedling establishment in Arabidopsis under osmotic stress. To further investigate the regulation mechanism of DsPTP1 in osmotic stress and drought signaling, we analyzed the water holding capacity between wild type and dsptp1 mutant. The dsptp1 mutant exhibited enhanced water holding capacity compared to wild type under osmotic stress resulting from reduced water loss and increased relative water content, which shall contribute the osmotic and drought tolerance. To identify the signaling components, we investigated the activity of MAPKs under osmotic and drought stress and found that the DsPTP1 differentially regulates the activities of MAPK6 and a p38 MAPK, which is inferred as MAPK12 according to its molecular weight in Arabidopsis under osmotic and salt stress. However, there is no direct interaction between DsPTP1 and 20 MAPKs indicated by the results of the of specific interaction test. These results suggest that the differential regulation of MAPK6 and MAPK12 by DsPTP1 is indirect. In addition, we screened the interaction proteins of DsPTP1 under abiotic stress. Seventeen positive clones were acquired from the sequencing results. More work need to be done to confirmed the positive interactions and the signaling cascades. In summary, seed germination and seedling growth are closely regulated by environmental cues. This should be the result of evolutionary selection since successful new growth from the seed embryo depends on the sensitive perception of environmental conditions and effective regulation of many physiological processes that are involved. We have demonstrated that plant hormones, especially ABA, play central regulative roles during such regulations. Many other signaling components, such as protein kinases and phosphatases, are also involved. Identifying the detailed signaling pathways should be the focus of further research.

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Nkomo, Mbukeni Andrew. "The role of p-coumaric acid on physiological and biochemical response of chia seedling under salt stress." University of the Western Cape, 2020. http://hdl.handle.net/11394/7954.

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Philosophiae Doctor - PhD The role of phenolic acids in mitigating salt stress tolerance have been well documented. However, there are contradicting reports on the effect of exogenously applied phenolic acids on the growth and development of various plants species. A general trend was observed where phenolic acids were shown to inhibit plant growth and development, with the exception of a few documented cases. One of these such cases is presented in this thesis. This study investigates the role of exogenously applied p-coumaric acid (p-CA) on physio-biochemical and molecular responses of chia seedlings under salt stress. This study is divided into three parts. Part one (Chapter 3) focuses on the impact of exogenous p-coumaric acid on the growth and development of chia seedlings. In this section, chia seedlings were supplemented with exogenous p-CA and the various biochemical and plant growth parameters were measured. The results showed that exogenous p-CA enhanced the growth of chia seedlings. An increase in chlorophyll, proline and superoxide oxide contents were also observed in the p-CA treatment relative to the control. We suggested that the increase in chia seedling growth could possibly be via the activation of reactive oxygen species-signalling pathway involving O2− under the control of proline accumulation (Chapter 3). Given the allopathy, nature of p-coumaric acid it is noteworthy that the response observed in this study may be species dependent, as contrasting responses have been reported in other plant species. Part two (Chapter 4) of this study investigates the influence of piperonylic acid (an inhibitor of endogenous p-coumaric acid) on the growth and development of chia seedlings. In trying to illustrate whether p-CA does play a regulatory role in enhancing pseudocereal plant growth, we treated chia seedlings with the irreversible inhibitor of C4H enzyme, to inhibit the biosynthesis of endogenous p-CA. In this section, chia seedlings were treated with piperonylic acid and changes in plant growth, ROS-induced oxidative damage, p-CA content and antioxidant capacity was monitored. Inhibition of endogenous p-CA restricted chia seedling growth by enhancing ROS-induced oxidative damage as seen for increased levels of superoxide, hydrogen peroxide and the extent of lipid peroxidation. Although an increase in antioxidant activity was observed in response to piperonylic acid, this increase was not sufficient to scavenge the ROS molecules to prevent oxidative damage and ultimate cellular death manifested as reduced plant growth. The results presented in this section support our hypothesis that p-CA play an important regulatory role in enhancing chia seedling growth and development as shown in Chapter 3. Part three (Chapter 5) seeks to identify and functionally characterise p-coumaric acid induced putative protein biomarkers under salt stress conditions in chia seedlings. Previous studies have shown that p-CA reversing the negative effect caused by NaCl-induced salt stress. While these studies were able to demonstrate the involvement of p-CA in promoting plant growth under salt stress conditions, they focussed primarily on the physiological aspect, which lacks in-depth biochemical and molecular analysis (ionomic and proteomic data) which could help in detecting the genes/proteins involved in salt stress tolerance mechanisms. A comparative ionomics and proteomic study was conducted, with the aim of elucidating the pivotal roles of essential macro elements and/or key protein markers involved in p-CA induced salt stress tolerance in chia seedlings. With the exception of Na, all the other macro elements were decreased in the salt treatment. Contrary to what was observed for the salt treatment most of the macro elements were increased in the p-CA treatment. However, the addition of exogenous p-CA to salt stressed seedlings showed an increase in essential macro elements such as Mg and Ca which have been shown to play a key role in plant growth and development. In the proteomic analysis we identified 907 proteins associated with shoots across all treatments. Interestingly, only eight proteins were conserved amongst all treatments. A total of 79 proteins were unique to the p-CA, 26 to the combination treatment (NaCl + p-CA) and only two proteins were unique to the salt stress treatment. The unique proteins identified in each of the treatments were functionally characterised to various subcellular compartments and biological processes. Most of the positively identified proteins were localised to the chloroplast and plays key roles in photosynthesis, transportation, stress responses and signal transduction pathways. Moreover, the protein biomarkers identified in this study (especially in the p-CA treatment) are putative candidates for genetic improvement of salt stress tolerance in plants.

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Hosseini, Mohammad Khajeh. "The response of soybean seeds to the stresses of semi-arid environments during germination and early seedling growth." Thesis, University of Aberdeen, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.324912.

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Reduced water availability and salinity are two major environmental factors influencing crop establishment in semi-arid environments. Therefore the effect of reduced water availability using polyethylene glycol (PEG) 4000 solutions and of salinity (NaCl) on the germination of six soybean cultivars was examined. Cultivars differed in their response to reduced water availability and salinity and in their ability to recover from the stresses. A large increase in germination during a recovery period at 0 MPa following water stress suggested that PEG was not toxic whilst the failure of seeds to recover from high salinity revealed the toxic effects of NaCl. At the same water potential, germination in saline conditions was higher than that in PEG and the rate of water uptake by individual seeds was more rapid in NaCl solutions than in PEG. The most plausible explanation for the greater water uptake and germination in NaCl is that seeds accumulated salts which lowered their osmotic potential. The effects of NaCl on seedling growth were much greater when experiments were conducted in a hydroponic system compared with a paper towel method. However, analysis of the solutions soaking the paper towels revealed that 4.25 mMolal Ca2+ was available to the seeds in this system in saline conditions. This may have reduced Na+ uptake or provided a protective effect against Na+ toxicity. Germination (40%) was possible at a tissue Na+ concentration in the embryonic axis of 9.3mg g-1 FW whilst seedling growth was completely inhibited at a tissue Na+ concentration of 6.1 mg g-1 FW. Germination at higher tissue Na+ concentrations was associated with higher K++Ca2+ concentrations, suggesting that these ions may protect the seeds in the pregermination phase against salinity. A reduction in seed vigour due to ageing resulted in reduced germination under saline conditions compared to the germination of unaged seeds, but there was no significant interaction between salinity and seed ageing. However, unaged seeds showed a greater increase in germination after transfer to 0 MPa than did the aged seeds. Since both the site of ageing and the toxic effect of NaCl is the cell membrane, there may be additive effects of NaCl toxicity on cell membrane in aged seeds.

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Van, Tonder N. C. P., der Westhuizen C. Van, and der Westhuizen R. J. Van. "Interaction effects of effective microorganisms and prolonged storage on germination and seedling vigour of maize, sorghum and sunflower." Journal for New Generation Sciences, Vol 12, Issue 2: Central University of Technology, Free State, Bloemfontein, 2014. http://hdl.handle.net/11462/666.

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Published Article A study involving two incubation experiments and a germination experiment in sandy soil was conducted to determine the influence of Multiplied Effective Micro-organisms (M-EM) that were exposed to different levels of irradiation and temperature fluctuation as well as prolonged storage, on the germination and seedling vigour of maize, sorghum and sunflower. Irrespective of poor handling and/or prolonged storage of M-EM, seed treatment with M-EM improved germination under optimal conditions for all crops compared to the control. Increased planting depths and cold stress were used to create conditions where seed treatment with M-EM may improve germination and seedling growth. Seed treatment with M-EM significantly improved germination and seedling vigour of the stress-tolerant maize cultivar following cold stress. Similar improved seedling vigour results were observed for the stress-tolerant sunflower cultivar at increased planting depth. It was concluded that the beneficial influence of M-EM as a seed treatment was remarkable, even after exposure of M-EM to unfavourable environmental conditions and prolonged storage before application. Further research under field conditions and in different cultivation systems are required before the large scale application of M-EM as seed treatment can be recommended.

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Ertle, John Michael. "Effects of Short-term Chilling Stress on Seedling Quality and Post-transplanting Growth of Grafted and Nongrafted Watermelon." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1594742774066127.

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Gurmu, Mulugeta. "The effects of seed vigour and moisture stress on the germination and seedling establishment of wheat and sorghum." Thesis, University of Aberdeen, 1991. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU031802.

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The experiments reported in this thesis assessed vigour differences between seed lots of wheat and sorghum under suboptimal conditions. A vigour assessment for each lot of both species was quantified by calculating a value for the viability equation constant Ki. Imbibition of seed lots at lower water potentials reduced water uptake, radicle and coleoptile emergence and their subsequent extension. Similarly, seeds aged by controlled deterioration also resulted in reduced radicle and coleoptile emergence and growth compared to that of unaged seeds. The critical water potential for radicle emergence, coleoptile emergence and their subsequent extension was lower for sorghum than that required for wheat. In both species coleoptile emergence and its subsequent extension was more sensitive than radicle emergence and extension. Tolerance of desiccation of both species decreased as germination progressed. However, imbibition of seeds for 24 h and drying back to their original moisture content promoted seed invigoration in some cases. Cells from seminal roots of wheat and sorghum were shorter when imbibed in lower water potentials than when they were imbibed at higher water potentials. The high drought tolerant cv (DJ1) showed lower root solute potential than the low drought tolerant cv (IS9). The results discussed in this thesis indicate that the information derived from controlled deterioration might be used as an indicator of planting value under sub-optimal conditions.

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Venn, Susanna Elizabeth, and Susanna Venn@nt gov au. "Plant recruitment across alpine summits in south-eastern Australia." La Trobe University. School of Life Sciences, 2007. http://www.lib.latrobe.edu.au./thesis/public/adt-LTU20080526.160815.

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This thesis investigated aspects of plant recruitment across an altitudinal gradient of mountain tops in the Victorian Alps, Australia, and provides a baseline for the patterns and processes of alpine plant recruitment in the absence of large-scale disturbance. The patterns in alpine vegetation across the study sites were described in relation to abiotic environmental factors. Temperatures were lower and precipitation was higher at the high altitude sites. The vegetation did not differ significantly between the sites, although sites at low altitudes were shrubbier than those at high altitudes. Analysis of the soil seed bank revealed high mean densities of germinable seed (80 to 1400 seeds m-2) across the gradient of sites. The similarity between the seed bank samples and the standing vegetation was low (qualitative similarity: 0.08 to 0.2; quantitative similarity: 0.03 to 0.19). In laboratory germination experiments, I found rapid and substantial germination. Final percent germination was above 90% for most species. One species, Aciphylla glacialis, showed evidence of dormancy mechanisms. In subsequent experiments, I found that innate primary seed dormancy in this species could be broken with cold-wet stratification. There were no significant patterns in natural seedling recruitment across the altitudinal gradient. Similarities between the seedling flora and the standing vegetation were low (qualitative similarity: 0.18 to 0.45: quantitative similarity 0.04 to 0.09). Mean seedling density was best predicted by a combination of soil wilting point, altitude and plant litter. In some cases, seedling density was greater than 80 seedlings m-2. The relative importance of either negative (competitive) or positive (facilitative) interactions between seedlings with adjacent vegetation were investigated in relation to seed germination, seedling growth and seedling survival. Facilitative interactions were common at the higher altitude sites. At lower altitudes, facilitative and competitive interactions were common. Without close neighbours at high altitudes, seedlings were unlikely to survive into their second year. An understanding of plant recruitment can provide a useful basis for predicting species responses to large-scale disturbance and climate change.

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Books on the topic "Seedling stress"

Tauer, Charles G. Seed source influences juniper seedling survival under severe drought stress. USDA Forest Service, Rocky Mountain Forest and Range Experiment Station, 1987.

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Simpson, D. G. Long-nights and moisture stress affect Douglas-fir seedling growth, cold hardiness, dormancy and root growth potential. Forestry Canada, 1991.

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Drakeford, David R. The stress induced volatile emissions (SIVE) technique for measuring levels of stress in conifer seedlings. Canada BC Forest Resource Development Agreement, 1989.

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Institute, Ontario Tree Improvement and Forest Biomass. The effect of three film-forming antitranspirants on moisture stress of outplanted black spruce seedlings. s.n, 1987.

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Przymusiński, Roman. Białka łubinu indukowane jonami ołowiu i innymi czynnikami stresowymi. Wydawn. Nauk. Uniwersytetu im. Adama Mickiewicza w Poznaniu, 2003.

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Hawkins, Christopher David Borden. SIVE, a new stock quality test: The first approximation. Forestry Canada, 1992.

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Tauer, C. G. Seed source influences juniper seedling survival under severe drought stress. 1987.

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Al-Rjoub, Faisal Ahmed. Mapping quantitative trait loci affecting sucrose accumulation in barley seedlings under water stress. 1994.

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Koo, Chang Duck. Water stress, fertilization and light effects on the growth of nodulated, mycorrhizal red alder seedlings. 1989.

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Borsos-Matovina, Vera. The effect of Ambiol on growth and stress tolerance of Pinus banksiana and Picea mariana seedlings. 1997.

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Book chapters on the topic "Seedling stress"

Rundel, P. W., G. A. Baker, D. J. Parsons, and T. J. Stohlgren. "Postfire demography of resprouting and seedling establishment by Adenostoma fasciculatum in the California chaparral." In Plant Response to Stress. Springer Berlin Heidelberg, 1987. http://dx.doi.org/10.1007/978-3-642-70868-8_40.

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Li, Xuemei, and Lihong Zhang. "SA and PEG-Induced Priming for Water Stress Tolerance in Rice Seedling." In Advances in Intelligent and Soft Computing. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27537-1_104.

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Sung, Shi-Jean S., and Paul P. Kormanik. "Sucrose metabolism, growth and transplanting stress in sweetgum seedling taproots and stems." In The Supporting Roots of Trees and Woody Plants: Form, Function and Physiology. Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-017-3469-1_26.

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Sahoo, Smita, Pankaj Borgohain, Bedabrata Saha, Debojyoti Moulick, Bhaben Tanti, and Sanjib Kumar Panda. "Seed Priming and Seedling Pre-treatment Induced Tolerance to Drought and Salt Stress: Recent Advances." In Priming and Pretreatment of Seeds and Seedlings. Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-8625-1_12.

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Mukherjee, Soumya, Dhara Arora, and Satish Chander Bhatla. "Serotonin and Melatonin as Metabolic Signatures for the Modulation of Seed Development, Seedling Growth, and Stress Acclimatization." In Serotonin and Melatonin. CRC Press, 2016. http://dx.doi.org/10.1201/9781315369334-7.

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Pogson, Barry J., Krishna K. Niyogi, Olle Björkman, and Dean DellaPenna. "On the Respective Roles of the Various Xanthophylls During Seedling Development and High Light Stress in Arabidopsis." In Photosynthesis: Mechanisms and Effects. Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-3953-3_769.

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Shigalova, T. V., O. B. Chivkunova, and M. N. Merzlyak. "Effect of Water Stress on Fatty Acids of Chloroplasts in Saratovskaya 55 and Lutescence 1848 Var. Wheat Seedling." In Biological Role of Plant Lipids. Springer US, 1989. http://dx.doi.org/10.1007/978-1-4684-1303-8_63.

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Bailey, Bryan A., Hanhong Bae, Rachel Melnick, and Jayne Crozier. "The Endophytic Trichoderma hamatum Isolate DIS 219b Enhances Seedling Growth and Delays the Onset of Drought Stress in Theobroma cacao." In Endophytes of Forest Trees. Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-1599-8_10.

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Leipner, Jörg, and Peter Stamp. "Chilling Stress in Maize Seedlings." In Handbook of Maize: Its Biology. Springer New York, 2009. http://dx.doi.org/10.1007/978-0-387-79418-1_15.

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Ashraf, Muhammad Arslan, Rizwan Rasheed, Iqbal Hussain, Muhammad Iqbal, Muhammad Riaz, and Muhammad Saleem Arif. "Chemical Priming for Multiple Stress Tolerance." In Priming and Pretreatment of Seeds and Seedlings. Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-8625-1_19.

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Conference papers on the topic "Seedling stress"

Lindsey, Raymond S., and J. Mitchell McGrath. "Examining salt stress for improvement of seedling vigor." In American Society of Sugarbeet Technologist. ASSBT, 2011. http://dx.doi.org/10.5274/assbt.2011.99.

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Ma, Baodong, Ao Xu, Xuanxuan Zhang, and Lixin Wu. "Chlorophyll change and spectral response of maize seedling under iron stress." In 2016 IEEE International Geoscience and Remote Sensing Symposium (IGARSS). IEEE, 2016. http://dx.doi.org/10.1109/igarss.2016.7730672.

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ALENCAR, N. L. M., C. G. GADELHA, F. A. GONDIM, J. T. PRISCO, and E. GOMES FILHO. "OXIDATIVE STRESS STUDY OF JATROPHA CURCAS SEEDS SUBJECTED TO SALT STRESS DURING GERMINATION AND SEEDLING DEVELOPMENT." In IV Inovagri International Meeting. INOVAGRI/ESALQ-USP/ABID/UFRB/INCT-EI/INCTSal/INSTITUTO FUTURE, 2017. http://dx.doi.org/10.7127/iv-inovagri-meeting-2017-res4700860.

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Wu, Yan-bing, Zhen-min Yan, Da-fu Wu, Zhi-cheng Chen, Wen-yan Lv, and Hong-yun Zhang. "Effect of NaCl Stress on Seed Germination and Seedling Growth in Wheat." In 2010 4th International Conference on Bioinformatics and Biomedical Engineering (iCBBE). IEEE, 2010. http://dx.doi.org/10.1109/icbbe.2010.5517428.

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Zhang, Yong, Qiyang Chen, and Haoru Tang. "Variation on Photosynthetic Performance in Kiwifruit Seedling During Drought Stress and Rewatering." In 2018 International Workshop on Bioinformatics, Biochemistry, Biomedical Sciences (BBBS 2018). Atlantis Press, 2018. http://dx.doi.org/10.2991/bbbs-18.2018.13.

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Melnyk, A. V., Jia Peipei, and S. O. Butenko. "Growth and physiological compensation of mustard seedling after drought stress and rehydration." In IDEAS AND INNOVATIONS IN NATURAL SCIENCES. Baltija Publishing, 2021. http://dx.doi.org/10.30525/978-9934-26-047-6-2.

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Zhigacheva, I. V. "THE SPATIAL HINDERED PHENOLS INCREASE THE STABILITY OF PEA SEEDLING TO STRESS IMPACTS." In The All-Russian Scientific Conference with International Participation and Schools of Young Scientists "Mechanisms of resistance of plants and microorganisms to unfavorable environmental". SIPPB SB RAS, 2018. http://dx.doi.org/10.31255/978-5-94797-319-8-1236-1240.

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Hui Li and Nanning Duan. "Effects on the rice seedling growth by cadmium tolerant bacteria under cadmium stress." In 2011 International Conference on Remote Sensing, Environment and Transportation Engineering (RSETE). IEEE, 2011. http://dx.doi.org/10.1109/rsete.2011.5965930.

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Sukma, Kelik P. W., Isdiana Suprapti, Budi Setiadi Daryono, and Purnomo. "Germination and Seedling Growth of Hybrid and Madura Local Corn on Salt Stress." In 5th International Conference on Food, Agriculture and Natural Resources (FANRes 2019). Atlantis Press, 2020. http://dx.doi.org/10.2991/aer.k.200325.012.

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Zhou, T. T., L. Xue, and Z. M. Wang. "Photosynthetic response of greening seedling of four tree species to low temperature stress." In 2015 International Conference on Food Hygiene, Agriculture and Animal Science. WORLD SCIENTIFIC, 2016. http://dx.doi.org/10.1142/9789813100374_0024.

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