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Control of Nitrite Reductase Activity in Excised Embryos of Agrostemma githago

1974; Oxford University Press; Volume: 54; Issue: 6 Linguagem: Inglês

10.1104/pp.54.6.826

1532-2548

Machi Fukuyama Dilworth, Hans Kende,

Wastewater Treatment and Nitrogen Removal

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 being reduced to nitrite. When the endogenous nitrite production was increased by raising the level of nitrate reductase through simultaneous treatment with nitrate and benzyladenine, the activity of nitrite reductase was not higher than in embryos treated with nitrate alone. On the other hand, tungstate given together with nitrate drastically inhibited the development of nitrate reductase activity without reducing the enhancement of nitrite reductase activity. Nitrite enhanced nitrite reductase activity, though less efficiently than nitrate.