Mangrovibacter yixingensis sp. nov., isolated from farmland soil.

A Gram-staining-negative, facultatively anaerobic, rod-shaped, nitrogen-fixing bacterial strain, designated TULL-AT, was isolated from a farmland soil sample in Yixing, China. The optimal conditions for growth were 30 °C, pH 7.0-8.0 and 0% (w/v) NaCl. Q8 was the dominant respiratory quinone and the major polar lipids were phosphatidylethanolamine, phosphatidylglycerol and aminophospholipid. Phylogenetic analysis of 16S rRNA gene sequences showed that strain TULL-AT was most closely related to Mangrovibacter plantisponsor MSSRF40T (99.6%), followed by Salmonella enterica subsp. diarizonae DSM 14847T (96.8%) and Cronobacter condimenti 1330T (96.8 %). Sequence analysis of the genes rpoB, gyrB and hsp60 revealed that those of strain TULL-AT also exhibit high sequence similarity with those of the species M. plantisponsor MSSRF40T (95.5, 94.1 and 93.4%). The genomic DNA G+C content was 52 mol%. The major fatty acids of strain TULL-AT were C16 : 0, C16 : 1ω7c and/or C16 : 1ω6c, C18 : 1ω7c /C18 : 1ω6c, C14 : 0, C14 : 0 3-OH/iso-C16 : 1 I and iso-C17 : 1 I and/or anteiso-C17 : 1 B. Strain TULL-AT showed low DNA-DNA relatedness with M. plantisponsor MSSRF40T (35.10 ± 1.41%). Based on the multiple genotypic and phenotypic data, strain TULL-AT is considered to represent a novel species of the genus Mangrovibacter, for which the name Mangrovibacter yixingensis sp. nov. is proposed. The type strain is TULL-AT ( = ACCC 19709T = KCTC 42181T).