Fifty-two strains of photosynthetic rhizobia isolated from stem and root nodules of , and were compared with reference rhizobial strains representing , and species by performing a multivariate statistical analysis of 150 phenotypic characteristics. Eight phena, some of which contained subphena, were identified. rhizobia which synthesize bacteriochlorophyll were grouped in phenon 6, which contained three subphena, while nonphotosynthetic rhizobia were grouped in phena 1 and 2. Our results indicate that the photosynthetic rhizobia nodulating species belong to a phenon (phenon 6) that is separate from the genera (phena 1 to 5), (phenon 7), and (phenon 8).


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