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Thirteen novel strains were isolated from root nodules of three different leguminous plants of the genera Albizia, Kummerowia and Dalbergia grown in China. Cells of these strains were Gram-negative, strictly aerobic, non-spore-forming, motile rods. Phylogenetic analysis of 16S rRNA gene sequences revealed that they belong to the genus Rhizobium. A representative strain, CCBAU 25010T, showed 98.8 % 16S rRNA gene sequence similarity to its closest phylogenetic relative, Rhizobium sullae IS123T. The 16S–23S intergenic spacer (ITS) sequence of CCBAU 25010T shared 91.5 and 87.2 % sequence similarity, respectively, with those of Rhizobium etli CFN 42T and Rhizobium leguminosarum LMG 14904T. Analysis of the sequences of the housekeeping genes atpD and recA was in agreement with the results of ITS sequence analysis. The nodC gene sequence of CCBAU 25010T was identical to that of Rhizobium tropici CFN 299. DNA–DNA hybridization values for strain CCBAU 25010T ranged from 20.7 % (with Rhizobium mongolense USDA 1844T) to 34.4 % (with R. leguminosarum USDA 2370T). Cell protein SDS-PAGE, BOX-PCR and several phenotypic characteristics, such as use of sole carbon sources and antibiotic resistance, could differentiate the novel strains from defined Rhizobium species. We therefore propose that the novel strains reported in this study form a novel species, Rhizobium mesosinicum sp. nov., with the type strain CCBAU 25010T (=LMG 24135T =JCM 14777T).
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International Journal of Systematic and Evolutionary Microbiology vol. 59 , part 8, pp. 1919 - 1923
Supplementary Fig. S1. SDS-PAGE protein profiles of representative novel strains and reference strains.
Supplementary Fig. S2. BOX-PCR fingerprints of representative novel strains and reference strains.
Supplementary Fig. S3. Neighbour-joining trees based on 16S–23S rRNA ITS sequences and partially congruent, concatenated atpD and recA gene sequences of Rhizobium mesosinicum sp. nov. strains and phylogenetically related species of the genus Rhizobium .
Supplementary Table S1. Results of DNA–DNA hybridization analysis.
[PDF file of Supplementary Figures and Table](336 KB)