Ability of selected accessions of Phaseolus vulgaris L. to restrict nodulation by particular rhizobia |
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Authors: | Constanza Montealegre Judith Kipe-Nolt |
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Institution: | (1) Bean Program, Centro Internactional de Agricultura Tropical, (CIAT), AA 6713 Cali, Colombia;(2) Present address: Department of Soil Science, University of Minnesota, 1991 Upper Buford Circle, 55108 St. Paul, MN, USA;(3) Present address: Department of Biological and Allied Health Sciences, Hartline Science Center, Bloomsburg University, 17815 Bloornsburg, PA, USA |
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Abstract: | Plant genotypes that limit nodulation by indigenous rhizobia while nodulating normally with inoculant-strain nodule occupancy in Phaseolus vulgaris. In this study, eight of nine Rhizobium tropici strains and six of 15 Rhizobium etli strains examined, showed limited ability to nodulate and fix nitrogen with the two wild P. vulgaris genotypes G21117 and G10002, but were effective in symbiosis with the cultivated bean genotypes Jamapa and Amarillo Gigante. Five of the R. etli strains restricted in nodulation by G21117 and G10002 produced an alkaline reaction in yeast mannitol medium. In a competition experiment in which restricted strains were tested in 1:1 mixtures with the highly effective R. etli strain CIAT632, the restricted strains produced a low percentage of the nodules formed on G2117, but produced over 40% of the nodules formed on Jamapa. The interaction of the four Rhizobium strains with the two bean genotypes, based on the percentage of nodules formed, was highly significant (P<0.001). |
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Keywords: | Nodulation restriction Competition Phaseolus vulgaris L Rhizobium tropici Rhizobium etli |
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