Glycine supports in vivo reduction of nitrate in barley leaves

Kumar, Polumetla A. ; Nair, T. V. R. ; Abrol, Yash P. (1988) Glycine supports in vivo reduction of nitrate in barley leaves Plant Physiology, 88 . pp. 1486-1488. ISSN 0032-0889

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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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Source:Copyright of this article belongs to American Society of Plant Biologists.
ID Code:28917
Deposited On:18 Dec 2010 05:48
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