Abstract
A Gram-reaction-negative bacterial strain, designated fig4(T), was isolated from a subsurface sediment core of Qiangtang Basin permafrost in China. Cells were catalase- and oxidase-positive and rods. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain fig4(T )was a member of the family Hyphomicrobiaceae and was most closely related to members of the genera Pelagibacterium, Vasilyevaea and Devosia with 93.8-96.2% sequence similarities. The major cellular fatty acids were C16 : 0, C18 : 0, 11-methyl C18 : 1 ω7c, C19 : 0 cyclo ω8c and summed feature 8 (C18 : 1ω7c and/or C18 : 1ω6c). The major respiratory quinone was Q-10 and the major polar lipids were diphosphatidylglycerol, phosphatidylglycerol and two unknown glycolipids. The DNA G+C content was 60.7 mol%. Based on the phenotypic, phylogenetic and genotypic data, strain fig4(T) is considered to represent a novel species of a new genus in the family Hyphomicrobiaceae, for which the name Youhaiella tibetensis gen. nov., sp. nov. is proposed. The type strain is fig4(T) ( = CGMCC 1.12719(T) = JCM 19854(T)).
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