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Effect of applied nitrate on enzymes of ammonia assimilation in nodules ofCicer arietinum L.

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Summary

The relationship between N2-fixation, nitrate reductase and various enzymes of ammonia assimilation was studied in the nodules and leaves ofC. arietinum. In the nodules of the plants growing on atmospheric nitrogen, maximum activities of glutamine synthetase (GS), glutamate synthase (GOGAT), glutamate dehydrogenase (GDH), asparagine synthetase (AS) and aspartate aminotransferase (AAT) were recorded just prior to maximum activity of nitrogenase. In nitrate fed plants, the first major peak of GDH and AS coincided with that of nitrate reductase in the nodules. With the exception of AS, application of nitrate decreased the activities of all these enzymes in nodules but not in leaves. Activities of GS, GOGAT and AAT were affected to much greater extent than that of GDH. On comparing the plants grown without nitrate and those with nitrate, the ratios of the activities of GDH/GS and GDH/GOGAT in nitrate given plants, increased by 4 and 12 fold, respectively. The results presented in this paper suggest that in nodules of nitrate fed plants, assimilation of ammonia via GDH assumes much greater importance.

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Authors and Affiliations

  1. Department of Chemistry and Biochemistry, Haryana Agricultural University, 125 004, Hissar, India

    Veena Sawhney,  Amarjit & R. Singh

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  1. Veena Sawhney
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  2. Amarjit
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  3. R. Singh
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Sawhney, V., Amarjit & Singh, R. Effect of applied nitrate on enzymes of ammonia assimilation in nodules ofCicer arietinum L.. Plant Soil 86, 241–248 (1985). https://doi.org/10.1007/BF02182899

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  • DOI: https://doi.org/10.1007/BF02182899

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