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Plant Physiology 85:232-238 (1987)
© 1987 American Society of Plant Biologists

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Environmental and Stress Physiology

The Relationship between Water Binding and Desiccation Tolerance in Tissues

Christina W. Vertucci1,2 and A. Carl Leopold

Department of Plant Biology, Cornell University, Ithaca, New York 14853, Boyce Thompson Institute, Ithaca, New York 14853

In an effort to define the nature of desiccation tolerance, a comparison of the water sorption characteristics was made between tissues that were resistant and tissues that were sensitive to desiccation. Water sorption isotherms were constructed for germinated and ungerminated soybean axes and also for fronds of several species of Polypodium with varying tolerance to dehydration. The strength of water binding was determined by van't Hoff as well as D'Arcy/Watt analyses of the isotherms at 5, 15, and/or 25°C. Tissues which were sensitive to desiccation had a poor capacity to bind water tightly. Tightly bound water can be removed from soybean and pea seeds by equilibration at 35°C over very low relative humidities; this results in a reduction in the viability of the seed. We suggest that region 1 water (i.e. water bound with very negative enthalpy values) is an important component of desiccation tolerance.

1 Supported by a National Science Foundation Graduate Fellowship.

2 Present address: USDA-ARS, National Seed Storage Laboratory, Colorado State University, Fort Collins, CO 80523.




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Copyright © 1987 by the American Society of Plant Biologists