Plant Physiol. Drug Metab Dispos
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Plant Physiology 88:1486-1488 (1988)
© 1988 American Society of Plant Biologists

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Metabolism and Enzymology

Glycine Supports in Vivo Reduction of Nitrate in Barley Leaves

Polumetla A. Kumar, T. V. R. Nair and Yash P. Abrol

Nuclear Research Laboratory, New Delhi 110 012, India, Division of Plant Physiology, Indian Agricultural Research Institute, New Delhi 110 012, India

Glycine, a photorespiratory intermediate, enhanced the in vivo reduction of nitrate in barley (Hordeum vulgare L.) leaf slices, when included in the assay medium. Isonicotinyl hydrazide, an inhibitor of glycine oxidation, partially reduced NO2– production. The enhancement caused by glycine treatment was reversed by isonicotinyl hydrazide when both were present together in the medium. Similar effects were observed when the excised leaves were preincubated with the metabolite and the inhibitor. Glycine also partially relieved the inhibition of nitrate reduction caused by malonate, an inhibitor of the tricarboxylic acid cycle. The results support the hypothesis that glycine decarboxylation activity is a source of NADH for nitrate reductase activity.




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S. Ferrario-Méry, M.-H. Valadier, and C. H. Foyer
Overexpression of Nitrate Reductase in Tobacco Delays Drought-Induced Decreases in Nitrate Reductase Activity and mRNA
Plant Physiology, May 1, 1998; 117(1): 293 - 302.
[Abstract] [Full Text]


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