Plant Physiol.
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Plant Physiology 75:338-341 (1984)
© 1984 American Society of Plant Biologists

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Articles

Influence of Osmotic Adjustment on Leaf Rolling and Tissue Death in Rice (Oryza sativa L.)

Theodore C. Hsiao1, John C. O'Toole, Elizabeth B. Yambao and Neil C. Turner2

The International Rice Research Institute, Manila, Philippines

Osmotic adjustment, measured by the lowering of the osmotic potential at full turgor, and its influence on leaf rolling and leaf death was assessed in the lowland rice (Oryza sativa L.) cultivar IR36 in both the greenhouse and field. The degree of osmotic adjustment varied with the degree and duration of stress, but was usually 0.5 to 0.6 megapascal (maximally 0.8 to 0.9 megapascal) under severe stress conditions. In leaves in which osmotic adjustment was 0.5 to 0.6 megapascal, leaf rolling and leaf death occurred at lower leaf water potentials in adjusted than in nonadjusted leaves. We conclude that osmotic adjustment aids in the drought resistance of rice by delaying leaf rolling, thereby maintaining gas exchange, and by delaying leaf death.

1 Permanent address: Department of Land, Air and Water Resources, University of California, Davis, CA 95616.

2 Commonwealth Scientific and Industrial Research Organization, Division of Plant Industry, P.O. Box 1600, Canberra City, A.C.T. 2601, Australia.




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Copyright © 1984 by the American Society of Plant Biologists