1887

Abstract

A taxonomic study was carried out on strain R8-12, which was isolated from deep-sea water of the Indian Ocean during the screening of oil-degrading bacteria. The isolate was Gram-stain-negative, oxidase and catalase-positive. Growth was observed at salinities from 0.5 to 15 % (optimum 3 %), at pH from 6–10 (optimum 7–8) and at temperatures from 10 to 42 °C (optimum 28 °C). On the basis of 16S rRNA gene sequence similarity, strain R8-12 was shown to belong to the genus and to be related to DSM 13974 (97.2 %), B-5 (95.0 %), MACL04 (94.6 %), A-11-3 (94.3 %), T9 (93.8 %), SK2 (93.7 %) and W11-5 (93.7 %). The sequence similarities between R8-12 and other species of the genus ranged from 77.9 % to 86.9 %. The major fatty acids were C (31.8 %), Cω7 (20.3 %), Cω8 cyclo (15.8 %) and summed feature 3 (Cω6 and/or Cω7) (8.9 %). The polar lipids were phosphatidylglycerol (PG), phosphatidylethanolamine (PE), two aminolipids (AL1–AL2) and two phospholipids (PL1–PL2). Three alkane hydroxylase () genes were identified in the genome. The G+C content of the chromosomal DNA was 66.1 mol%. DNA–DNA hybridization showed that strain R8-12 and DSM 13974 had a DNA–DNA relatedness of 63±3 %. According to its phenotypic features and fatty acid composition as well as the 16S rRNA and gene sequences, the novel strain represents a member of the genus , but could be easily distinguished from all other known species of the genus described to date. The name sp. nov. is proposed, with the type strain R8-12 ( = MCCC 1A00382 = LMG 24621 = CCTCC AB 208234).

Funding
This study was supported by the:
  • China Ocean Mineral Resources Research and Development Association (COMRA) (Award DY125-15-R-01)
  • National Natural Science Foundation of China (Award 40906083/41176154/41276005)
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2013-12-01
2024-04-20
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