Figure 1

Identity and phylogeny of rhizobial strains isolated from common bean nodules. Neighbor-joining tree based on 16S rDNA sequences of the isolates and other related species of the family Rhizobiaceae. The tree is drawn to scale, with branch lengths in the same units as those of the evolutionary distances used to infer the phylogenetic tree. All positions containing alignment gaps and missing data were eliminated only in pairwise sequence comparisons. Bootstrap probabilities (as percentage) were determined from 1000 resamplings. Bar, 0.01 substitutions per nucleotide position. Note that the validated name of the genus Sinorhizobium is Ensifer [59].