Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 57:11-14 (1976)
© 1976 American Society of Plant Biologists

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Articles

Effects of Water Stress on the Ultrastructure of Leaf Cells of Sorghum bicolor

Kenneth L. Giles, Daniel Cohen and Michael F. Beardsell

a Plant Physiology Division, Department of Scientific and Industrial Research, Palmerston North, New Zealand

The subcellular changes which occurred in sorghum leaves during increasing water stress and subsequent rewatering are described. Stomata were closed, abscisic acid levels were elevated, and the amounts of starch in the bundle sheath chloroplasts were much reduced by - 14 bars leaf water potential. Swelling of the outer chloroplast membrane, and reorganization of the tonoplast to form small vesicles from the large central vacuole, occurred by a leaf water potential of - 37 bars. Complete structural disruption of the tonoplast, as previously described for maize was not found. On rewatering, large amounts of starch reappeared within three hours. These findings strengthen the hypothesis that maintenance of tonoplast integrity is an important factor in the ability of plants to withstand drought.






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1976 by the American Society of Plant Biologists