Plant Physiology 43:1821-1828 (1968)
© 1968 American Society of Plant Biologists
Articles
Biogenesis of Oxalate in Plant Tissues
Chi-Cheng Chang and
Harry Beevers
Department of Biological Sciences, Purdue University, Lafayette, Indiana 47907
Red beet root discs aerated in potassium phosphate for 2 to 3 days and young spinach leaves actively produce oxalate. A series of labeled compounds was supplied to each of these tissues to determine the extent of conversion to oxalate. Similar results were obtained with the 2 tissues except that in the leaf tissue glyoxylate and glycolate were outstandingly good precursors. Carbon from glucose, acetate, and particularly from some acids of the tricarboxylic acid cycle was recovered in oxalate. Extracts from both tissues were found to contain an enzyme which converts oxaloacetate to oxalate and acetate. The enzyme was partially purified and some of its properties are described. A pathway of oxalate synthesis which does not include glycolate or its oxidase is therefore proposed.
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