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Plant Physiology 69:1365-1368 (1982)
© 1982 American Society of Plant Biologists

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Articles

Metabolism of L-Threonic Acid in Rumex x acutus L. and Pelargonium crispum (L.) L'Hér 1

Johannes P. Helsper and Frank A. Loewus2

Institute of Biological Chemistry, Washington State University, Pullman, Washington 99164

L-Threonic acid is a natural constituent in leaves of Pelargonium crispum (L.) L'Hér (lemon geranium) and Rumex x acutus L. (sorrel). In both species, L-[14C]threonate is formed after feeding L-[U-14C]ascorbic acid to detached leaves. R. acutus leaves labeled with L-[4-3H]- or L-[6-3H]ascorbic acid produce L-[3H]threonate, in the first case internally labeled and in the second case confined to the hydroxymethyl group. These results are consistent with the formation of L-threonate from carbons three through six of L-ascorbic acid. Detached leaves of P. crispum oxidize L-[U-14C] threonate to L-[14C]tartrate whereas leaves of R. acutus produce negligible tartrate and the bulk of the 14C appears in 14CO2, [14C]sucrose, and other products of carbohydrate metabolism. R. acutus leaves that are labeled with L-[U-14C]threonate release 14CO2 at linear rate until a limiting value of 25% of the total [U-14C]threonate is metabolized. A small quantity of [14C]glycerate is also produced which suggests a process involving decarboxylation of L-[U-14C]threonate.

2 To whom inquiries and requests for reprints should be addressed.

1 Supported by grants from the National Institutes of Health (GM-22427), the National Science Foundation (PCM-7813254), and the Netherlands Organization for the Advancement of Pure Research (Z. W. O.). Scientific paper No. 6075, Project 0266, College of Agriculture Research Center, Washington State University, Pullman, WA 99164.






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ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1982 by the American Society of Plant Biologists