Ammonium repression of nitrate reductase formation in Lemna minor L
1Department of Botany, The University, M13 9PL, Manchester, UK.
Abstract:
The presence of ammonium is shown to inhibit the nitrate-promoted formation of nitrate reductase in Lemna minor L. The ammonium inhibition does not result from an inhibition of nitrate accumulation. The kinetics of the ammonium inhibition suggest it is not a direct effect of ammonium. The inhibition could result from the build up of a product of ammonium assimilation or an ammonium induced regulatory protein. It is suggested that both the nitrate stimulation and the 'ammonium' inhibition of nitrate reductase formation can be accounted for by a transcriptional control system.
Related Concept Videos
Inorganic Nitrogen Assimilation
2° Amines to N-Nitrosamines: Reaction with NaNO2
Preparation of Amines: Reduction of Amides and Nitriles
Amides can be reduced to primary, secondary, and tertiary amines using catalytic hydrogenation, active metals like Fe,...
Preparation of Amines: Reduction of Oximes and Nitro Compounds
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
Preparation of Amines: Reductive Amination of Aldehydes and Ketones
Nitriles to Amines: LiAlH4 Reduction
As shown below, the mechanism involves three steps. Firstly, the hydride ion acting as a nucleophile attacks the nitrile carbon to form an anion. In the second step, a second equivalent of the hydride ion attacks the anion to...


