Water Stress
Mostrando 1-12 de 1348 artigos, teses e dissertações.
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1. Effects of Water Stress on Respiration in Soybean Leaves1
The effect of water stress on respiration and mitochondrial electron transport has been studied in soybean (Glycine max) leaves, using the oxygen-isotope-fractionation technique. Treatments with three levels of water stress were applied by irrigation to replace 100%, 50%, and 0% of daily water use by transpiration. The levels of water stress were characteriz
American Society of Plant Biologists.
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2. Comparisons of Photosynthetic Responses of Xanthium strumarium and Helianthus annuus to Chronic and Acute Water Stress in Sun and Shade 1
We have examined the effects of mild, chronic water stress and acute water stress on two water stress sensitive plants, Xanthium strumarium and Helianthus annuus. Using a combination of the leaf disc O2 electrode to measure the light responses of photosynthesis and 77 K fluorescence to monitor damage to the primary photochemistry, we have found the following
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3. Water Stress Enhances Ethylene-mediated Leaf Abscission in Cotton 1
Abscission of cotyledonary leaves from cotton (Gossypium hirsutum L. cv. Stoneville 213) seedlings occurred following relief from water stress. The amount of abscission was related to the magnitude of the plant water deficit. Leaf abscission promoted by exogenous ethylene was enhanced in seedlings subjected to water stress. Treatment with ethylene (2.0 to 3.
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4. Effect of water stress on nitrogen fixation and nodule structure of common bean.
The aim of this work was to investigate the effect of water stress on N2 fixation and nodule structure of two common bean (Phaseolus vulgaris L.) cultivars Carioca and EMGOPA-201. Plants were harvested after five and eight days of water stress. Carioca had lower nodule dry weight on both water stress periods; shoot dry weight was lower at five days water str
Pesquisa Agropecuária Brasileira. Publicado em: 2011
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5. Stomatal Response of Cotton to Water Stress and Abscisic Acid as Affected by Water Stress History 1
The threshold leaf water potential required to initiate stomatal closure in cotton (Stoneville 213) became progressively more negative when plants were subjected to a series of water stress cycles. The shift in the threshold water potential required for induction of stomatal closure was dependent on the number of previous stress cycles and leaf age. The basa
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6. Mild Water Stress of Phaseolus vulgaris Plants Leads to Reduced Starch Synthesis and Extractable Sucrose Phosphate Synthase Activity 1
Mild water stress, on the order of −1.0 megapascals xylem water potential, can reduce the rate of photosynthesis and eliminate the inhibition of photosynthesis caused by O2 in water-stress-sensitive plants such as Phaseolus vulgaris. To investigate the lack of O2 inhibition of photosynthesis, we measured stromal and cytosolic fructose-1,6-bisphosphatase, s
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7. Compatible Solutes Protect against Chaotrope (Ethanol)-Induced, Nonosmotic Water Stress
Water stress is one of the major stresses experienced by cellular systems and can take a number of distinct forms. In response to turgor-related osmotic stress, cells produce compatible solutes that are macromolecule protectants and also counteract the outflow of water from stressed cells. In this report we show that the germination of conidia of Aspergillus
American Society for Microbiology.
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8. Changes in Frost Hardiness of Stem Cortical Tissues of Cornus stolonifera Michx. after Recovery from Water Stress 1
Moderate water stress increases frost hardiness in many woody plants but little attention has been given to changes in hardiness after recovery from water stress. Tests were carried out to examine how much water stress-induced frost hardiness remained when plants were rewatered under different day length regimes. Red osier dogwood plants (Cornus stolonifera
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9. Effect of Water Stress on Ethylene Production by Detached Leaves of Valencia Orange (Citrus sinensis Osbeck)
Detached leaves of Valencia oranges, Citrus sinensis Osbeck, emanated ethylene at markedly higher rates and contained more endogenous ethylene when placed under water stress at 55% relative humidity than when placed in water-saturated air. Water stress induced defoliation from detached branches. Relieving the water stress of such leaves by transfer to a mist
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10. Leaf Age as a Determinant in Stomatal Control of Water Loss from Cotton during Water Stress 1
The stomatal resistance of individual leaves of young cotton plants (Gossypium hirsutum L. var. Stoneville 213) was measured during a period of soil moisture stress under conditions of constant evaporative demand. When plants were subjected to increasing soil water stress, increases in stomatal resistance occurred first on the lower leaves and the stomata on
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11. AFLP marker linked to water-stress-tolerant bulks in barley (Hordeum vulgare L.)
The amplified fragment length polymorphism (AFLP) assay is an efficient method for the identification of molecular markers, useful in the improvement of numerous crop species. Bulked Segregant Analysis (BSA) was used to identify AFLP markers associated with water-stress tolerance in barley, as this would permit rapid selection of water-stress tolerant genoty
Genetics and Molecular Biology. Publicado em: 2003
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12. Mild Water Stress Effects on Carbon-Reduction-Cycle Intermediates, Ribulose Bisphosphate Carboxylase Activity, and Spatial Homogeneity of Photosynthesis in Intact Leaves 1
We have examined the effect of mild water stress on photosynthetic chloroplast reactions of intact Phaseolus vulgaris leaves by measuring two parameters of ribulose bisphosphate (RuBP) carboxylase activity and the pool sizes of RuBP, 3-phosphoglycerate (PGA), triose phosphates, hexose monophosphates, and ATP. We also tested for patchy stomatal closure by fee