Abstract
The relative efficiency of nitrogen fixation by nodules and the H 2-uptake hydrogenase activity of bacteroids produced by hydrogenase-positive strains of Rhizobium leguminosarum and R. japonicum in different legume hosts have been examined. Bacteroids from nodules of Pisum sativum and Vicia faba from strain 128C53 of R. leguminosarum showed a capacity to take up H 2, but no hydrogenase activity was detected in bacteroids from nodules of Lens culinaris inoculated with the same strain. Seven R. japonicum strains produced nodules in Glycine max and Vigna unguiculata and three of these were also able to nodulate Vigna radiata. In all these cases, the nodules evolved little or no H 2 in air and the bacteroids isolated from strain 3I1b6 had 10-fold less hydrogenase activity when isolated from V. radiata than when obtained from nodules of G. max or V. unguiculata. These results demonstrate a strain-dependent host effect on the expression of H 2-uptake hydrogenase in legume nodules.
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