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Metabolic Conversion of L-Ascorbic Acid to Oxalic Acid in Oxalate-accumulating Plants ¹

^a Division of Cell and Molecular Biology, State University of New York at Buffalo, Buffalo, New York 14214

L-Ascorbic acid-1-¹⁴C and its oxidation product, dehydro-L-ascorbic acid, produced labeled oxalic acid in oxalate-accumulating plants such as spinach seedlings (Spinacia oleracea) and the detached leaves of woodsorrel (Oxalis stricta and O. oregana), shamrock (Oxalis adenopylla), and begonia (Begonia evansiana). In O. oregana, conversion occurred equally well in the presence or absence of light. This relationship between L-ascorbic acid metabolism and oxalic acid formation must be given careful consideration in attempts to explain oxalic accumulation in plants.

¹ This research was supported by Grant No. GM-12422 from the National Institutes of Health and by a grant from Hoffmann-LaRoche, Inc., Nutley, N.J.

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