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Vacuolar Deposition of Ascorbate-derived Oxalic Acid in Barley ¹

Department of Biology, Brookhaven National Laboratory, Upton, New York 11973

L-[1-¹⁴C]Ascorbic acid was supplied to detached barley seedlings to determine the subcellular location of oxalic acid, one of its metabolic products. Intact vacuoles isolated from protoplasts of labeled leaves contained [¹⁴C]oxalic acid which accounted for about 70% of the intraprotoplast soluble oxalic acid. Tracer-labeled oxalate accounted for 36 and 72% of the ¹⁴C associated with leaf vacuoles of seedlings labeled for 22 and 96 hours, respectively.

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				T. A. Kostman, N. M. Tarlyn, F. A. Loewus, and V. R. Franceschi Biosynthesis of L-Ascorbic Acid and Conversion of Carbons 1 and 2 of L-Ascorbic Acid to Oxalic Acid Occurs within Individual Calcium Oxalate Crystal Idioblasts Plant Physiology, February 1, 2001; 125(2): 634 - 640. [Abstract] [Full Text]