function of hydraulic and chemical water stress signalization in evaluation of drought resistance of juvenile plants
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ID: 130854
2002
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Abstract
In laboratory hydroponic experiments with spring barley genotypes the juvenile plants with 5 leaves were tested for their physiological responses to osmotic stress evoked by blocking the water uptake in roots by polyethylenglycol (PEG-6000) and to exogenous abscisic acid (ABA) applied in the nutrient solution which inhibits the stomata opening. Results from the measurements of leaf diffusion resistance, relative water content, transpiration and leaf elongation rates show dominant role of chemical signalization drought from root environment and of stomata in the regulation of water loss as well as sensitiveness of leaf elongation to lowered water availability. Maintenance of water content and turgor in the leaf tissues resulted from expression of morphological and physiological mechanisms of resistance and tolerance to drought different from that in mature plants which might be useful in the screening genotypes with different level of drought tolerance.
| Reference Key |
olovsk2002journalfunction
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| Authors | ;K OLŠOVSKÁ;M BRESTIČ |
| Journal | balkan medical journal |
| Year | 2002 |
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