Synthesis of L(+)Tartaric Acid from 5-Keto-D-gluconic Acid in Pelargonium
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概要
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5-Keto-D-[1-^<14>C]gluconic acid, the most effective precursor of L(+)tartaric acid among all labeled compounds which have ever been tested in grapes, was found to be a good precursor of L(+)tartaric acid in a species of Pelargonium. The synthesis of labeled L(+) tartaric acid from D-[1 -^<14>C]glucose in Pelargonium was remarkably depressed when a 0.5% solution of D-gluconate or 5-keto-D-gluconate was administered continu-ously to leaves together with D-[1-^<14>C]glucose. Our results provide strong evidence that D-[1-^<14>C]glucose is metabolized in Pelargonium to give labeled L(+)tartaric acid via (probably D-gluconic acid and) 5-keto-D-gluconic acid without passing through L-ascorbic acid. Labeled L-idonic acid was found in young leaves of Pelargonium which had been labeled with L-[U-^<14>C]ascorbic acid. The synthesis of the labeled L-idonic acid increased when a 0.lo/o solution of L-threonate was administered continuously to leaves together with L-[U-^<14>C]ascorbic acid. Specifically labeled compounds, recognized as the members of the synthetic pathway for L(+)tartaric acid from L-ascorbic acid via L-idonic acid in grapes, were administered to young leaves of Pelargonium. Each compound (2-keto-L-[U-^<14>C]idonic acid, L-[U-^<14>C]idonic acid, 5-keto-D-[1-^<14>C]gluconic acid and 5-keto-D-[6-^<14>C]gluconic acid) was partly metabolized, as in grapes. The metabolic pathway starting from L-ascorbic acid to L(+)tartaric acid via L-idonic acid, however, did not actually contribute to the synthesis of L(+)tartaric acid in Pelargonium probably because the activity of each metabolic step was much lower than that observed in grapes.
- 日本植物生理学会の論文
著者
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KASAI ZENZABURO
The Research Institute for Food Science, Kyoto University
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Kasai Z
Research Institute For Food Science Kyoto University:plant Nutrition Laboratory College Of Agricultu
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Kasai Z
The Research Institute For Food Science Kyoto University
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Kasai Zenzaburo
The Res Arch Instrtute For Food Sclence Kyoto University
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Saito K
Kyoto Univ. Kyoto Jpn
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Saito Kazumi
The Radioisotope Research Center, Kyoto University
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Morita Shin-ichiro
The Research Institute for Food Science, Kyoto University
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Morita S
The Research Institute For Food Science Kyoto University
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