Comparative effects of osmotic-, salt- and alkali stress on growth,photosynthesis, and osmotic adjustment of cotton plants |
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Authors: | W?Chen C?Feng W?Guo D?Shi Email author" target="_blank">C?YangEmail author |
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Institution: | (1) Key Laboratory of Vegetation Ecology (Ministry of Education), Northeast Normal University, Changchun, Jilin Province, 130024, China; |
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Abstract: | In this study, cotton seedlings were subjected to osmotic-, salt- and alkali stresses. The growth, photosynthesis, inorganic
ions, and organic acids in the stressed seedlings were measured, to compare the mechanisms by which plants adapt to these
stresses and attempt to probe the mechanisms by which plants adapt to high pH stress. Our results indicated that, at high
stress intensity, both osmotic and alkali stresses showed a stronger injurious effect on growth and photosynthesis than salt
stress. Cotton accumulated large amount of Na+ under salt and alkali stresses, but not under osmotic stress. In addition,
the reductions of K+, NO3
−, and H2PO4
− under osmotic stress were much greater than those under salt stress with increasing stress intensity. The lack of inorganic
ions limited water uptake and was the main reason for the higher injury from osmotic-compared to salt stress on cotton. Compared
with salt- and alkali stresses, the most dramatic response to osmotic stress was the accumulation of soluble sugars as the
main organic osmolytes. In addition, we found that organic acid metabolism adjustment may play different roles under different
types of stress. Under alkali stress, organic acids might play an important role in maintaining ion balance of cotton; however,
under osmotic stress, malate might play an important osmotic role. |
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Keywords: | |
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