Effect of simulated acid rain on nodulation and nitrogen metabolism in Vigna radiata cultivars |
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Authors: | G. Kumaravelu M.P. Ramanujam |
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Affiliation: | (1) Kanchi Mamunivar Centre for Post-Graduate Studies, Pondicherry-, 605 008, India |
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Abstract: | Nodulation was inhibited in plants of green gram (Vigna radiata, cvs. ADT-1 and CO-5) exposed to different levels of simulated acid rain using a mixture of H2SO4, HNO3 and HCl (6:3:1) of pH 2.5, 4.0 and 5.5 in comparison with control (pH 7.0). Protein content of leaves increased in cv. CO-5 but decreased in cv. ADT-1 whereas the nitrate content of leaves increased in cv. ADT-1 but lowered in cv. CO-5. Nitrate reductase activity was increased in the nodular roots of cv. ADT-1 but was decreased in leaves. In cv. CO-5 it was increased in leaves but was insignificantly reduced in the nodules at pH 2.5. The nodule nitrogenase activity increased at pH 4.0 and 2.5 in cv. ADT-1. This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | acid mixture green gram nitrate reductase nitrogenase proteins |
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