Rhizobium albus sp. nov., Isolated from Lake Water in Xiamen, Fujian Province of China

A Gram-stain-negative, aerobic bacterial strain, designated Y21 T , was isolated from surface lake water in Xiamen, Fujian Province of China. Growth was observed at temperatures from 4 to 37 °C, at salinities from 0 to 7.0 % and at pH from 6.0 to 10.0. Optimum growth was observed at 28 °C, at pH 7.0 and with 1.5–2.0 % (w/v) NaCl. The highest similarity of 16S rRNA gene sequence between strain Y21 T and the other strains was 96.9 %. Phylogenetic analysis based on 16S rRNA gene sequencing revealed that the strain was a member of the genus Rhizobium , forming a distinct lineage with R. subbaraonis KCTC 23614 T . The dominant fatty acids were summed feature 8 (comprising C 18:1 ω 7 c and/or C 18:1 ω 6 c ), C 18:1 ω 7 c 11-methyl, which accounted for 78.1 %. The G+C content of the chromosomal DNA was 60.9 mol%. The predominant respiratory quinone was ubiquinone-10. The polar lipids of strain Y21 T were found to consist of five unidentified phospholipids and three unidentified aminolipids. According to its morphology, physiology, fatty acid composition and 16S rRNA sequence data, strain Y21 T should be regarded as a new species of the genus Rhizobium , for which Rhizobium albus sp. nov. is proposed (type strain Y21 T = MCCC 1F01210 T = KCTC 42252 T ).