Department of Biology, State University of New York at Buffalo, Buffalo, New York 14214.
Plant Physiol. 1974 Nov;54(5):784-7. doi: 10.1104/pp.54.5.784.
The metabolic fate of l-ascorbic acid-1-(14)C and -6-(14)C has been investigated in two species in two genera of Vitaceae. Results suggest that ascorbic acid metabolism in the Vitaceae involves splitting the 6-carbon chain into 4- and 2-carbon fragments. The former, corresponding to C1 through C4 of ascorbic acid, is further oxidized to tartaric acid while the latter, corresponding to C5 and C6, is recycled into hexose phosphate metabolism. Comparison of these findings with previous observations on the conversion of ascorbic acid to (+)-tartaric acid in Pelargonium crispum clearly reveals two distinct processes of tartaric acid biosynthesis in those plants identified as tartaric acid accumulators.
已在两个科的两个属的两个物种中研究了 l-抗坏血酸-1-(14)C 和 -6-(14)C 的代谢命运。结果表明,抗坏血酸在葡萄科中的代谢涉及将 6 碳链分裂成 4-和 2-碳片段。前者对应于抗坏血酸的 C1 到 C4,进一步被氧化为酒石酸,而后者对应于 C5 和 C6,被回收进入己糖磷酸代谢。将这些发现与以前在 Pelargonium crispum 中观察到的抗坏血酸转化为(+)-酒石酸的情况进行比较,清楚地揭示了在被鉴定为酒石酸积累物的植物中存在两种截然不同的酒石酸生物合成过程。