Competition between effective and less effective strains of Bradyrhizobium spp. for nodulation on Vigna radiata
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Local and exotic cowpea bradyrhizobial strains were examined for their effectiveness and competitive ability on the cultivated Vigna radiata (mungbean) variety NM-51. The seven most efficient N2-fixing strains were then evaluated for their competitiveness against two less effective strains in a pair-wise inoculation experiment. Nodule occupancy was determined using fluorescent antibodies. The most efficient strain, Vr-2, could not compete with less effective strains for nodule occupancy, so the biomass and N yield were low. Bradyrhizobial strain M-55 had good competitive ability, as it occupied almost 50% of nodules in comparison with less effective strains and improved the biomass and N yield of mungbean significantly. Competitiveness/compatibility is one of the vital parameters for the selection of inocula strains, therefore, M-55, K-92 and Vr-6 are recommended as good inocula of commercial quality because of their competitiveness along with their highly efficient N2-fixation.
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