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Plant Physiology 65:675-679 (1980)
© 1980 American Society of Plant Biologists

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Malate Decarboxylation by Kalanchoë daigremontiana Mitochondria and Its Role in Crassulacean Acid Metabolism

David A. Day1

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

Mitochondria isolated from Kalanchoë daigremontiana, a Crassulacean acid metabolism plant, decarboxylate added malate to pyruvate at rates of up to 100 micromoles per hour per milligram original chlorophyll in the presence of ADP. Omitting ADP reduces this rate by approximately 50%. Antimycin A inhibits malate decarboxylation and this inhibition could be relieved by addition of aspartate and {alpha}-ketoglutarate to the mitochondria. Increasing the pH of the external medium inhibited malate decarboxylation; a dramatic decrease in pyruvate production was observed between pH 7.2 and pH 7.4. It is suggested that cytoplasmic pH changes may regulate the contribution of mitochondria to malate decarboxylation in the light in vivo.

1 Recipient of a Queen Elizabeth II Postdoctoral Fellowship.




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Copyright © 1980 by the American Society of Plant Biologists