Author: M. Zayed 1
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  • 1 El-Menoufiya University Botany Department, Faculty of Science Shibin El-Kom Egypt
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The experiment was made by using different concentrations of polyethylene glycol (PEG) or salt solutions to decrease the osmotic potential of the growth medium to reveal the response of Phaseolus vulgaris to water and salt stresses. No germination (emergence of the radicles) occurred at medium osmotic potential lower than −1.0 MPa in all treatments. It was found that the activity of α-amylase and protease, and contents of proline, saccharides and the soluble proteins decreased in the germinating seeds during 3-day stress. However, after 10-day stress, the contents of organic solutes and the mineral uptake were also significantly reduced under stress. The seedlings under water stress induced by PEG were affected much more than under salinity. This may be due to the maintenance of a higher succulence under salt stress than under PEG-induced water stress.

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