Mesorhizobium xinjiangense sp. nov., isolated from rhizosphere soil of Alhagi sparsifolia.

A beige-pigmented, Gram-strain-negative, aerobic, rod-shaped, non-flagellated and non-gliding bacterium, designated strain lm94, was isolated from rhizosphere soil of Alhagi sparsifolia obtained from Alar city, located in Xinjiang province, China. Growth occurred at 20-45 °C (optimum, 37 °C), in the presence of 0-6% (w/v) NaCl (optimum, 0-1%) and at pH 6.0-9.5 (optimum, pH 7.0-7.5). Phylogenetic analysis based on 16S rRNA gene sequence showed that strain lm94 belonged to the genus Mesorhizobium, with highest sequence similarity to Mesorhizobium wenxiniae WYCCWR 10195 (96.6%). Genome sequencing revealed a genome size of 5 256 375 bp and a G + C content of 63.6 mol%. The average nucleotide identity value and the digital DNA-DNA hybridization value between strain lm94 and M. wenxiniae LMG 30254 were 75.0% and 20.0%, respectively. The major respiratory quinone was Q-10. The major fatty acids were C cyclo ω8c and Summed Feature 8 (C ω6c and/or C ω7c) and its polar lipids consisted of phosphatidylethanolamine (PE), phosphatidylglycerol (PG), unidentified phospholipid (PL), phosphatidylcholine (PC), diphosphatidylglycerol (DPG), unidentified aminolipid (AL), unknown glycolipid (GL), unidentified aminophospholipid (APL2) and unidentified polar lipid (L1 and L2). On the basis of these data, strain lm94 is considered to represent a novel species of the genus Mesorhizobium, for which the name Mesorhizobium xinjiangense sp. nov. is proposed. The type strain is lm94 (=KCTC 72863=CCTCC AB2019377).