Mesorhizobium silamurunense sp. nov., isolated from root nodules of Astragalus species
2012
Zhao, Chun Tian | Wang, En Tao | Zhang, Yan Ming | Chen, Wen Feng | Sui, Xin Hua | Chen, Wen Xin | Liu, Hong Can | Zhang, Xiao Xia
Four rhizobial strains representing a previously defined novel group in the genus Mesorhizobium and isolated from Astragalus species in China were further characterized using a polyphasic approach. Phylogenetic analysis of 16S rRNA gene sequences showed that these Gram-negative bacteria belonged to the genus Mesorhizobium, with Mesorhizobium plurifarium LMG 11892T as the closest neighbour sharing a sequence similarity of 99.8 %. Comparative sequence analysis of the atpD, recA, glnII, rpoB, nodC and nifH genes, SDS-PAGE of whole-cell soluble proteins, DNA–DNA hybridization, fatty acid profiles and a series of phenotypic and physiological tests differentitated the novel group from all recognized species of the genus Mesorhizobium. Based on the data obtained in the present and previous studies, this group represents a novel species within the genus Mesorhizobium, for which the name Mesorhizobium silamurunense sp. nov. is proposed. The type strain is CCBAU 01550T ( = HAMBI 3029T = LMG 24822T), and could form effective nodules on Astragalus membranaceus, Astragalus adsurgens and Caragana intermedia, and ineffective nodules on Phaseolus vulgaris in cross-nodulation tests.
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