Citrate metabolism in soybean cotyledons

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Citrate metabolism and the citrate cleavage enzyme were investigated in soybean (Glycine max (L.), Merr.) cotyledons throughout development and during the first 5 days of germination. It was noted that both the lipid synthesizing and the acetyl CoA generating systems are present when the soybean seed matures, and that the activity of these systems declines throughout development as citrate increases. Citrate represents 1% of the cotyledon dry weight at seed maturity. During the first 24 hr of germination, there was an activation of the citrate cleavage enzyme and a concomitant drop of some 60% in citrate content. Accompanying the drop in citrate content is the de novo synthesis of fatty acids for use in the production of phospholipids. All of the data are consistent with the hypothesis that acetyl CoA for lipid synthesis is supplied by the citrate molecule via the citrate cleavage enzyme and that activity of this system is necessary both during seed development and during germination.
日本植物生理学会の論文