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Ammonia-Assimilating Enzymes in Arabidopsis Mutant A-154

The levels of ammonia-assimilating enzymes were assayed in Arabidopsis mutant A-154 Glutamine synthetase activity in the mutant is slightly higher than that of the wild type, and glutamate dehydrogenase activity was approximately half that of the wild type Traces of glutamate synthase activity were detected in the mutant plants when ferredoxin was used as a cofactor in the reaction mixture, whereas with NADPH, there was no significant difference in the activity of this enzyme between wild type and mutant plants The growth and glutamate synthase activity of mutant A-154 were inhibited by high concentrations of ammonia in the medium; nitrate nutrition favored both