Abstract
Two hundred and eighty seven isolates of Rhizobium nodulating Phaseolus vulgaris L. were sampled in France from four geographically distant field populations. They were characterized by their colony morphology and by plasmid profiles. A representative sample was further characterized: a) by the ability of each isolate to nodulate a potential alternative host Leucaena leucocephala and to grow on specific media, and b) by RFLP analysis of PCR amplified 16S rRNA genes. On the basis of their phenotypic and genetic characteristics the isolates could be assigned either to Rhizobium leguminosarum bv phaseoli, or to R. tropici. The two species co-occurred at three sites. R. leguminosarum bv phaseoli represented 2%, 4%, 72% and 100% of the population at the four different sites. Eighteen and 22 different plasmid profiles were identified within R. tropici and R. leguminosarum bv phaseoli, respectively. Some of them were conserved between distant geographical regions. The fact that R. tropici was found in France shows that this species is not limited to tropical regions and gives additional evidence of the multi-specific nature of the Phaseolus microsymbiont, even over a geographically limited area.
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Amarger, N., Bours, M., Revoy, F. et al. Rhizobium tropici nodulates field-grown Phaseolus vulgaris in France. Plant Soil 161, 147–156 (1994). https://doi.org/10.1007/BF00046386
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DOI: https://doi.org/10.1007/BF00046386