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Wenxinia marina gen. nov., sp. nov., a novel member of the Roseobacter clade isolated from oilfield sediments of the South China Sea

¹ State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, PR China
² College of Biological Sciences, China Agricultural University, Beijing 100094, PR China

Correspondence
Zhi-Pei Liu
liuzhp{at}sun.im.ac.cn

An aerobic and heterotrophic, Gram-negative bacterial isolate, strain HY34^T, was isolated from sediment of an oilfield in the South China Sea, China. The taxonomy of strain HY34^T was studied by phenotypic and phylogenetic methods. Strain HY34^T formed faint-pink colonies on marine agar 2216. Cells of strain HY34^T were non-motile, ovoid or short rods. Strain HY34^T was positive for catalase and oxidase, and nitrate was reduced to nitrite. The nearly complete 16S rRNA gene sequence of strain HY34^T was obtained and sequence analysis showed that it, together with the genus Rubellimicrobium, formed a distinct clade close to some members of the Roseobacter clade in the family Rhodobacteraceae, and it showed highest sequence similarities to Oceanicola granulosus HTCC2516^T (93.8 %), Silicibacter lacuscaerulensis ITI-1157^T (93.3 %), Dinoroseobacter shibae DFL 12^T (93.3 %) and Rubellimicrobium thermophilum C-lvk-R2A-2^T (92.2 %). Bacteriochlorophyll a was not detected. The ubiquinone system was Q-10. The major polar lipids were phosphatidylglycerol, phosphatidylcholine and an unidentified glycolipid. The major fatty acids (>10 %) were C_{18 : 1}7c and C_{16 : 0}. The DNA G+C content of this strain was 69.4 mol%. A polyphasic analysis supported the conclusion that this strain represents a novel genus and species, which we designated Wenxinia marina gen. nov., sp. nov. The type strain of Wenxinia marina is HY34^T (=CGMCC 1.6105^T =JCM 14017^T).

A transmission electron micrograph of cells of strain HY34^T, results of 2D TLC of the polar lipids of strain HY34^T and a comparison of the fatty acid profiles of HY34^T and related strains are available as supplementary material with the online version of this paper.