The genetic and phylogenetic relationships for strains of and its relatives were compared by an analysis of the results of sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) of whole-cell proteins, DNA-DNA hybridization, and full 16S rRNA gene sequencing. The strains of formed a cluster which was distinct from those of other species in the clustering analysis of SDS-PAGE. DNA-DNA relatedness between A-1BS (type strain of ) and the type or reference strains for , and cluster U, an unnamed rhizobial group, ranged from 4.4 to 43.8%. The phylogenetic analysis based on the 16S rRNA gene sequences showed that was closely related to the phylogenetic branch and could be distinguished from the other four species in this branch. These results further confirmed that these bacteria constitute a distinct rhizobial species.


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