1887

Abstract

An obligately piezophilic bacterium was isolated from sediment collected from the bottom of the Japan Trench at a depth of 7542 m. The isolated strain, designated K41G, was closely affiliated with members of the genus on the basis of 16S rRNA gene sequence analysis. Levels of DNA–DNA relatedness between strain K41G and reference strains were significantly lower than that accepted as the phylogenetic definition of a species. The optimal temperature and pressure for growth of strain K41G were 6 °C and 60 MPa, respectively. The DNA G+C content was 39.1 mol%. Whole-cell fatty acids consisted of significant amounts of unsaturated fatty acids C (37 %) and C (17 %), saturated fatty acid C (31 %) and polyunsaturated fatty acid C (8 %). Based on the taxonomic differences observed, strain K41G is considered to represent a novel obligately piezophilic species. The name (type strain, K41G=JCM 11830=ATCC BAA-638) is proposed. This is the second species of obligately piezophilic bacteria to be proposed in the genus .

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2007-06-01
2019-12-05
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