Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 68:1222-1225 (1981)
© 1981 American Society of Plant Biologists

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Articles

Solute Leakage Resulting from Leaf Desiccation

A. Carl Leopold, Mary E. Musgrave and Kathleen M. Williams

Boyce Thompson Institute, Ithaca, New York 14853

The leakage of solutes from foliar tissue is utilized as a dynamic measure of apparent changes in membrane integrity in response to desiccation. It is found that rehydrating leaf discs of cowpea (Vigna sinensis [L.] Endl.) show increasing leakiness in proportion to the extent of prior desiccation, whereas Selaginella lepidophylla Spring., a resurrection plant, does not. The elevated leakage rate of cowpea after desiccation recovers with time, and the passage of time in the stressed condition results in reduced subsequent leakiness. These characteristics are interpreted as suggesting that the leakage of solute reflects the condition of cellular membranes, and that desiccation stress leads to lesions in the membranes. The kinetics of solute leakage is suggested as a simple means of following changes in membrane lesions and associated features of membrane repair and hardening.




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Copyright © 1981 by the American Society of Plant Biologists