7 rezultatus
Nitrate reductase can be induced in isolated embryos of Agrostemma githago by treatment with cytokinin. By labeling proteins with H2 (18)O and subsequent isopycnic density gradient centrifugation it was proved that the benzyladenine induction of nitrate reductase is caused by a de-novo synthesis of
When excised embryos of Agrostemma githago were incubated with nitrate, the activities of both nitrate reductase and nitrite reductase were enhanced. By contrast, benzyladenine induced nitrate reductase only. Our data suggest that nitrate affected nitrite reductase activity directly, without first
Nitrate reductase activity in excised embryos of Agrostemma githago increases in response to both NO(3) (-) and cytokinins. We asked the question whether cytokinins affected nitrate reductase activity directly or through NO(3) (-), either by amplifying the effect of low endogenous NO(3) (-) levels,
NADH-nitrate reductase activity in excised embryos of Agrostemma githago develops in response to nitrate as well as benzyladenine. Induction of nitrate reductase by benzyladenine was much more susceptible to inhibition by a mixture of amino acid analogues and by cordycepin than induction by nitrate.
The effects of cytokinin and nitrate on the activity of nitrate reductase (NR) in isolated embryos of Agrostemma githago L. were studied. It was shown that the effects of cytokinin and NO-3 on the induction of NR is additive during 8, 12 and 18 hrs of embryos incubation in the solutions of the two
In dark-grown, isolated embryos of Agrostemma githago, a transient period of nitrate-reductase (NR) (NADH: nitrate oxidoreductase, EC 1.6.6.1) activity occurred from 6 to 36 h after the start of imbibition. During this period, NR activity was enhanced by nitrate, 6-benzylamino-purine and ethylene.