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Paracoccus halophilus sp. nov., isolated from marine sediment of the South China Sea, China, and emended description of genus Paracoccus Davis 1969

State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100080, PR China

Correspondence
Shuang-Jiang Liu
liusj{at}sun.im.ac.cn

An aerobic bacterial isolate, strain HN-182^T, was isolated from sediments of the South China Sea. Cells of strain HN-182^T are coccoid to short rods, Gram-negative, non-spore-forming and non-motile. Strain HN-182^T is heterotrophic and grows well on marine broth (Difco 2216), and is not capable of growing autotrophically on reduced sulfur. Grows at temperatures ranging from 7 to 42 °C (optimum at 25 °C), but not at 4 or 45 °C, and at pH 5.0–9.0 (optimum at pH 7.0), but not at pH 4.5 or 9.5. NaCl is required for growth [0.5–8.5 % (w/v)] with an optimum of 4.5 %. Cells are positive for catalase, oxidase and urease activities. Nitrate is not reduced. Strain HN-182^T contains ubiquinone-10 as sole respiratory quinone. The major polar lipids are phosphatidylglycerol, diphosphatidylglycerol, phosphatidylcholine, an unidentified phospholipid and an unidentified glycolipid. Major cellular fatty acids are C18 : 17c (60.7 %), C16 : 0 (12.5 %) and C18 : 0 (8.1 %). DNA G+C content is 67.2 mol% (by T_m). The analysis of 16S rRNA gene sequences indicated that strain HN-182^T was related to members of the genus Paracoccus, with similarities ranging from 91.2 to 96.7 % (highest to Paracoccus versutus) and a close relationship with Paracoccus sulfuroxidans, indicating that strain HN-182^T is a member of Paracoccus. Based on these results, it is concluded that strain HN-182^T represents a novel species of the genus Paracoccus, for which the name Paracoccus halophilus sp. nov. is proposed. The type strain is HN-182^T (=CGMCC 1.6117^T=JCM 14014^T).

An electron micrograph of strain HN-182^T and a figure showing its polar lipids profile are available as supplementary material with the online version of this paper.

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