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Plant Physiology 84:153-156 (1987)
© 1987 American Society of Plant Biologists

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Environmental and Stress Physiology

Effect of High Temperature on Calcium Uptake by Suspension-Cultured Pear Fruit Cells

Joshua D. Klein1 and Ian B. Ferguson

Division of Horticulture and Processing, Department of Scientific and Industrial Research, Private Bag, Auckland, New Zealand

Uptake of Ca2+ by suspension-cultured pear (Pyrus communis L. cv Passe Crassane) cells and protoplasts was significantly enhanced by exposure to 38°C compared to 25°C. The increased uptake was specific for Ca2+ and was not due to cell wall binding. Tissues pretreated at 38°C showed increased uptake even upon return to 25°C. Treatment with carbonylcyanide m-chlorophenylhydrazone, salicylhydroxamic acid + KCN, or arsenite also increased Ca2+ content of cells. Results are discussed with regard to membrane permeability changes, the cellular control of Ca2+, and heat treatments used to inhibit softening of fruit during postharvest storage.

1 Current address: Ministry of Agriculture, ARO, Volcani Centre, P. O. Box 6, Bet Dagan 50-250, Israel.




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Copyright © 1987 by the American Society of Plant Biologists