Histidinibacterium lentulum gen. nov., sp. nov., a marine bacterium from the culture broth of marine microalga Picochlorum sp. 122

A Gram-stain-negative, non-spore-forming, aerobic, motile, ovoid or short rod shaped bacterium, designed strain B17 T , was isolated from the culture broth of Picochlorum sp. 122. Phylogenetic analyses based on 16S rRNA gene sequences indicated that strain B17 T forms a stable cluster with Oceanicolagranulosus MCCC 1A10589 T (with the highest 16S rRNA gene similarity of 95.8 %) and Roseisalinusantarcticus DSM 11466 T in the family Rhodobacteraceae. The only detected respiratory quinone was Q-10. The major cellular fatty acids were C18 : 1 ω7c/ω6c, C17 : 1iso I/anteiso B and C16 : 0. The major polar lipids were phosphatidylglycerol, diphosphatidylglycerol, an unidentified phospholipid and two unidentified lipids. The genome G+C content was 69 mol%. Characteristics, such as a long lag phase, being motile with single polar flagellum, no aminolipid content, and little or no C18 : 1ω7c11-methyl and C19 : 0cyclo ω8c content could significantly distinguish strain B17 T from its closely related type strains. Therefore strain B17 T is suggested to represent a new species in a new genus, for which Histidinibacterium lentulum gen. nov., sp. nov. is proposed. The type strain B17 T (=MCCC 1K03225 T =KCTC 52553 T ).