Effect of water and salt stresses on growth, chlorophyll, mineral ions and organic solutes contents, and enzymes activity in mung bean seedlings |
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Authors: | MA Zayed IM Zeid |
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Institution: | (1) Botany Department, Faculty of Science, El-Menoufiya University, Shibin El-Kom, Egypt |
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Abstract: | 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 mung bean (Vigna radiata) to water and salt stresses. No germination
(emergence of the seedling) 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-d stress. However, after 10-d stress, the contents of organic solutes and the activity of the hydrolytic enzymes
increased. Growth, chlorophyll content and 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.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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Keywords: | α -amylase proline protease proteins saccharides Vigna radiata |
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