Abstract
l-Ascorbic acid-[UL- 14C] has been used to follow the appearance of 14C-labeled oxalic acid and tartaric acid as metabolic products of oxidative cleavage of ascorbic acid in geranium apices ( Pelargonium crispum). The enantiomeric specificity of ascorbic acid metabolism was established in geranium by comparing the incorporation of d- and l-ascorbic acid-[6- 14C] in the presence of l-ascorbic acid-[4- 3H]. l-Ascorbic acid-[4- 3H] has been used to demonstrate the retention of 3H during biosynthesis of l-(+)-tartaric acid in the geranium and its exchange with water during biosynthesis of l-( +)-tartaric acid in the grape.
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