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Plant and Cell Physiology, 1979, Vol. 20, No. 8 1481-1488
© 1979

Article

The metabolism of L-[6-14C]ascorbic acid in detached grape leaves1

Kazumi Saito2 and Frank A. Loewus

Department of Agricultural Chemistry, Washington State University Pullman, Washington 99164, U.S.A.

Grape leaves (Vitis labrusca L.) that are removed from the position opposite the flower cluster either 28 or 14 days before anthesis cleave L-ascorbic acid (AA) at the C4-C5 bond into a C4 and, presumably, a C2 fragment. Leaves taken from this position 14 days after anthesis fail to cleave AA. The C4 fragment is utilized for L(+)-tartaric acid (TA) biosynthesis while the C2 fragment is recycled into hexose and products of the hexose metabolism. When [6-14C]AA is the source of the label, the sucrose-derived glucose from labeled leaves has a distribution of 14C in the carbon skeleton as follows: Cl, 35%; C2, 14%; C3, 4%; C(4+5), 13% and C6, 34%. The effect of inhibitors of the glycolate pathway on [6-l4C]AA metabolism is examined.

1This work was supported by Grant No. GM-22427 from the National Institute of General Medical Science, National Institute of Health, United States Public Health Service, Bethesda, Maryland. This is Scientific paper No. 5305, Project 0266, College of Agricultural Research Center, Washington State University, Pullman, WA 99164, U.S.A.

2Present address: The Radioisotope Research Center, Kyoto University, Kyoto 606, Japan.

(Received August 29, 1979; )
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