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Plant Physiology 59:126-128 (1977)
© 1977 American Society of Plant Biologists

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Articles

Effect of Phosphoenolpyruvate and Oxaloacetate on Ca2+ Uptake by Isolated Mung Bean Mitochondria 1

Robert J. Graessera

Richard H. Wilson2,b

a CIBA-Geigy Corporation, Greenville, Mississippi 38701, Monsanto Agricultural Company, St. Louis, Missouri 63166

Phosphoenolpyruvate partially inhibits the accumulation of Ca2+ in isolated mung bean (Phaseolus aureus Roxb.) mitochondria. Succinate-supported Ca2+ uptake is twice as sensitive to phosphoenolpyruvate inhibition as is NADH- or malate/pyruvate-supported Ca2+ uptake. Pyruvate, atractylate, and ATP, but not ITP, reverse the phosphoenolpyruvate-induced inhibition. Oxaloacetic acid inhibits succinate-supported Ca2+ uptake completely while partially inhibiting NADH-supported Ca2+ uptake. The oxaloacetate inhibition of NADH-supported Ca2+ uptake is greater than that produced by phosphoenolpyruvate. It is suggested that inhibition of Ca2+ uptake is due to the conversion of phosphoenolpyruvate into oxaloacetate via phosphoenolpyruvate carboxykinase, with oxaloacetate responsible for the actual inhibition of Ca2+ uptake.

2 To whom reprint requests should be made.

1 This research is part of the dissertation submitted by R. J. G. in partial fulfillment of a Master of Science degree, University of Texas, Austin.






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Copyright © 1977 by the American Society of Plant Biologists