Abstract
Rhizobial bacteroids undergo unique modifications in peanut root nodules. To determine the likely effect of such modifications on nitrogen fixation, peanuts and cowpeas were nodulated by the same strain of Rhizobium and nitrogenase activities (C 2H 2-reduction) were compared over 4 weeks. Peanuts were found to have one and a half to three times higher C 2H 2-reduction activity/unit nodule mass than cowpeas at different nodule ages. Nitrogen accumulated in the plant tops/unit weight of nodules on the roots was three times greater in peanuts. The bacteroid protein content/unit of nodule mass was very similar for the two species.
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