Effects of univalent cations on the formation of nitrate reductase and nitrite reductase in rice seedlings

概要

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An investigation was made to determine the effects of univalent cations as activators on the formation of nitrate reductase and nitrite reductase in rice seedlings. K^+ functioned more effectively as a univalent cation activator than did other univalent cations examined. Substitution of Rb+ for K^+ resulted in stimulation of nitrate reductase formation at about half the rate obtained with K^+. There was no effect on nitrite reductase formation. Na+ could be partially substituted for K^+ in the formation of both enzymes. NH_4^+ slightly inhibited formation of the enzymes. In the absence of univalent cations, enzyme formation proceeded at a slower rate during the initial 15-hr period, but thereafter proceeded at a higher rate. This delayed formation was not observed in the presence of K^+. Results from inhibitor experiments suggest that K^+ stimulates the formation of nitrate reductase and nitrite reductase. In conclusion, when nitrate nitrogen is supplied to rice plants utilization of the nitrogen may be accelerated by increased formation of enzymes involved in nitrate assimilation in the presence of K^+.
日本植物生理学会の論文