THE IMPORTANCE OF GLYOXYLATE IN AMINO ACID BIOSYNTHESIS IN PLANTS

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Abstract
[C14] Glyoxylate was rapidly metabolized by carrot storage tissues, pea leaves, pea cotyledons, sunflower cotyledons, corn coleoptiles, corn roots and pea roots. In many tissues over 70% of the supplied [C14] glyoxylate was utilized during the 6-hour experimental periods. In all tissues, the chief products of [C14] -glyoxylate metabolism were carbon dioxide, glycine, and serine. In several of the tissues, there was also a considerable incorporation of the label into the organic acids, particularly into glycollate. Degradations of the labelled serine produced during [C14] glyoxylate metabolism showed that glyoxylate C was incorporated into all 3 positions of the serine molecule. The results are interpreted as indicating that glyoxylate is utilized by the tissues by pathways involving transamination, transmethylation, reduction, and oxidative decarboxylation of the supplied glyoxylate.