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Plant Physiology 72:134-138 (1983)
© 1983 American Society of Plant Biologists

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Synthesis of Oxalic Acid by Enzymes from Lettuce Leaves

David D. Davies1 and Hassan Asker1

Station de Physiologie Végétale, Institut National de la Recherche Agronomique, La Grande Ferrade, 33140 Pont-de-la-Maye, Bordeaux, France

A rapid purification of lactate dehydrogenase and glycolate oxidase from lettuce (Lactuca sativa) leaves is described. The kinetics of both enzymes are reported in relation to their possible roles in the production of oxalate. Lettuce lactate dehydrogenase behaves like mammalian dehydrogenase, catalyzing the dismutation of glyoxylate to glycolate and oxalate. A model is proposed in which glycolate oxidase in the peroxisomes and lactate dehydrogenase in the cytosol are involved in the production of oxalate. The effect of pH on the balance between oxalate and glycolate produced from glyoxylate suggests that in leaves lactate dehydrogenase may function as part of an oxalate-based biochemical, pH-stat.

1 Present address: School of Biological Sciences, University of East Anglia, Norwich NR4 7TJ U.K.






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1983 by the American Society of Plant Biologists