Plant Physiol.
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Plant Physiology 52:403-406 (1973)
© 1973 American Society of Plant Biologists

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Inhibition of Postoxidative Calcium Release in Corn Mitochondria by Inorganic Phosphate 1

M. J. Earnshaw2 and J. B. Hanson

a Department of Botany, University of Illinois, Urbana, Illinois 61801

Respiration drives the accumulation of a small amount of calcium in corn (Zea mays L.) mitochondria, and this calcium is released when respiration ceases. A postenergized addition of phosphate leads to phosphate uptake and enhaced calcium retention. Oligomycin, KCN, 2,4-dinitrophenol, or mersalyl are without effect on the phosphate-induced calcium retention. Addition of phosphate also inhibits the release of endogenous phosphate which normally accompanies the calcium. It is suggested that passive phosphate uptake retards the release of endogenous phosphate which is complexed with the calcium.

2 Present address: Department of Botany, University of Manchester, Manchester M13 9PL, England.

1 This work was supported by the United States Atomic Energy Commission Grant AT (11-1) 790.






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ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1973 by the American Society of Plant Biologists