Chachezhania antarctica gen. nov., sp. nov., a novel member of the family ‘Rhodobacteraceae’ isolated from Antarctic seawater

A Gram-stain-negative, aerobic, non-flagellated, rod-shaped bacterium, designated strain SM1703 T , was isolated from Antarctic seawater collected near the Chinese Antarctic Great Wall Station, King George Island, West Antarctica. Phylogenetic analysis based on 16S rRNA gene sequences revealed that strain SM1703 T formed a distinct phylogenetic lineage within the family ‘ Rhodobacteraceae ’, sharing high 16S rRNA gene sequence similarity with Marivita litorea (95.5%). The strain grew at 10–37 °C (optimum, 25 °C) and with 0.5–13% (w/v) NaCl (optimum, 3–5%). The major cellular fatty acids were C 19:0 cyclo ω 8 c , C 18:1 ω 7 c , C 18:1 2-OH and C 16:0 2-OH. The major polar lipids were phosphatidylglycerol, phosphatidylcholine, an unidentified aminolipid and an unidentified lipid. The genomic DNA G+C content of strain SM1703 T was 64.6 mol%. Based on the results of the polyphasic characterization for strain SM1703 T , it is classified as the representative of a novel species in a new genus of the family ‘ Rhodobacteraceae ’, for which the name Chachezhania antarctica gen. nov., sp. nov. is proposed. The type strain of Chachezhania antarctica is SM1703 T (= MCCC 1K03470 T = KCTC 62794 T = CCTCC AB 2018351 T ).