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Psychromonas hadalis sp. nov., a novel piezophilic bacterium isolated from the bottom of the Japan Trench

Yuichi Nogi, Shoichi Hosoya, Chiaki Kato and Koki Horikoshi

Extremobiosphere Research Center, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan

Correspondence
Yuichi Nogi
nogiy{at}jamstec.go.jp

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^T, was closely affiliated with members of the genus Psychromonas on the basis of 16S rRNA gene sequence analysis. Levels of DNA–DNA relatedness between strain K41G^T and Psychromonas 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^T 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_{16 : 1} (37 %) and C_{14 : 1} (17 %), saturated fatty acid C_{16 : 0} (31 %) and polyunsaturated fatty acid C_{22 : 6} (8 %). Based on the taxonomic differences observed, strain K41G^T is considered to represent a novel obligately piezophilic Psychromonas species. The name Psychromonas hadalis (type strain, K41G^T=JCM 11830^T=ATCC BAA-638^T) is proposed. This is the second species of obligately piezophilic bacteria to be proposed in the genus Psychromonas.

Present address: Laboratory of Bioresources, Institute of Molecular and Cellular Biosciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan.

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