Abstract
The stimulation of oxygen uptake in plant mitochondria uncoupled by 2,4-dinitrophenol (DNP) depends on adenine nucleotide in the absence of hexokinase (EC 2.7.1.1). Laties (9) observed this dependence with cauliflower bud mitochondria oxidizing malate, while WViskich and Bonner (13) reported a doubling of the DNP-rate of oxygen uptake by adenine nucleotide in sweet potato mitochondria oxidizing succinate. 'Tomato fruit mitochondria also showed a dependence on adenine nucleotide in the presence of DNP and succinate and the absence of hexokinase (5). Heytler (7) reported a graduated suppression of oxygen uptake with increasing concentrations of the uncoupler, in-Cl-carbonyl cyanide phenylhydrazone, in the presence of hexokinase, in mouse liver mitochondria oxidizing succinate. Inhibition of succinate oxidation in rat liver and potato mitochondria in the absence of hexokinase depended on the concentration of uncoupler -(12, 13). The inhibition of succinate oxidation may be due to an inhibition of succinate dehyodrogenase (EC 1.3.99.1) by oxaloacetate (13). Wiskich and Bonner (13) suggested that ATP, which could be formed
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