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Abstract

A bacterial strain, designated BAR1, was isolated from a microbial mat growing on the surface of a barite chimney at the Loki’s Castle Vent Field, at a depth of 2216 m. Cells of strain BAR1 were rod-shaped, Gram-reaction-negative and grew on marine broth 2216 at 10–37 °C (optimum 27–35 °C), pH 5.5–8.0 (optimum pH 6.5–7.5) and 0.5–5.0 % NaCl (optimum 2 %). The DNA G+C content was 57.38 mol%. The membrane-associated major ubiquinone was Q-10, the fatty acid profile was dominated by Cω7 (91 %), and the polar lipids detected were phosphatidylcholine, phosphatidylglycerol, phosphatidylethanolamine, one unidentified aminolipid, one unidentified lipid and one unidentified phospholipid. Phylogenetic analyses based on 16S rRNA gene sequences showed that strain BAR1 clustered together with PRT1, as well as the genera and in a polyphyletic clade within the clade. Several characteristics differentiate strain BAR1 from the aforementioned genera, including its motility, its piezophilic behaviour and its ability to grow at 35 °C and under anaerobic conditions. Accordingly, strain BAR1 is considered to represent a novel genus and species within the clade, for which the name gen. nov., sp. nov. is proposed. The type strain is BAR1 (=JCM 31874=DSM 104147).

Funding
This study was supported by the:
  • Norwegian Research Council (Award 179560)
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2019-02-13
2024-04-26
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