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Plant Physiology 53:104-109 (1974)
© 1974 American Society of Plant Biologists

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The Oxidation of Malate and Exogenous Reduced Nicotinamide Adenine Dinucleotide by Isolated Plant Mitochondria 1

D. A. Day and J. T. Wiskich

a Department of Botany, University of Adelaide, Adelaide, 5001, Australia

Exogenous NADH oxidation by cauliflower (Brassica oleracea L.) bud mitochondria was sensitive to antimycin A and gave ADP/O ratios of 1.4 to 1.9. In intact mitochondria, NADH-cytochrome c reductase activity was only slightly inhibited by antimycin A. The antimycin-insensitive activity was associated with the outer membrane. Malate oxidation was sensitive to both rotenone and antimycin A and gave ADP/O values of 2.4 to 2.9. However in the presence of added NAD+, malate oxidation displayed similar properties to exogenous NADH oxidation. In both the presence and absence of added NAD+, malate oxidation was dependent on inorganic phosphate and inhibited by 2-n-butyl malonate.

1 Financial support was provided by a Commonwealth Post-graduate Award to D.A.D., and by the Australian Research Grants Committee.






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Copyright © 1974 by the American Society of Plant Biologists