Abstract
The roles of the pyruvate decarboxylation pathway and TCA metabolic cycle in activation of anaerobic metabolism in ripening Hamlin oranges were investigated. Oranges were harvested weekly from October to February during the 1980–81 and 1981–82 growing season. Juice vesicles from each weekly sample were assayed for pyruvate decarboxylase, alcohol dehydrogenase, malic enzyme, phosphoenolpyruvate carboxylase, malate dehydrogenase, citrate synthase, isocitrate dehydrogenase and cytochrome oxidase. Also, juice was assayed for ethanol, acetaldehyde, pyruvate, oxalacetate, malate and citrate. In December when ethanol accumulated rapidly in the fruit, pyruvate decarboxylase and alcohol dehydrogenase increased markedly. During the same month, the pyruvate level declined, suggesting that the increases in enzyme levels activated the conversion of pyruvate to ethanol.
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