FIG. 1.

Phylogenetic affiliations of 16S rRNA gene sequences derived from strains ASI1 and MSH1 and closely related α-proteobacteria type strains. The phylogenetic tree was constructed using a neighbor-joining algorithm with Jukes-Cantor distance correction. The root of the tree was determined by including the 16S rRNA gene sequence of Mesorhizobium loti in the analysis. The accession number for each sequence is given in parentheses. The scale bar indicates 3 nucleotide substitutions per 100 nucleotides.