Xanthine dehydrogenase (XDH) is an important enzyme in purine metabolism. It is involved in regulation of the normal growth and non-biological stress-induced ageing processes in plants. The present study investigated XDH's role in regulating rice leaf senescence. We measured physical
Biochemical and genetical characterization of a rice nitrate reductase (NR)-deficient mutant, M819, which had been isolated as a chlorate-resistant mutant, was carried out. In M819, leaf NADH-NR activity was found to be about 10% of that of the wild-type cv 'Norin 8', while NADPH-NR activity was
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