, Volume 3, Issue 1, pp 71–77

Taxonomic studies of extremely barophilic bacteria isolated from the Mariana Trench and description of Moritella yayanosii sp. nov., a new barophilic bacterial isolate

  • Y. Nogi
  • Chiaki Kato

DOI: 10.1007/s007920050101

Cite this article as:
Nogi, Y. & Kato, C. Extremophiles (1999) 3: 71. doi:10.1007/s007920050101


We have isolated two strains of extremely barophilic bacteria from sediment collected from the world's deepest ocean floor in the Mariana Trench, Challenger Deep, at a depth of 10 898 m [Kato C, Li L, Nogi Y, Nakamura Y, Tamaoka J, Horikoshi K (1998) Appl Environ Microbiol 64:1510-1513]. One strain, DB21MT-2, was identified as a strain of Shewanella benthica, and the other strain, DB21MT-5, is closely affiliated with members of the genus Moritella on the basis of 16S rDNA sequence analysis. The hybridization values for DNA-DNA relatedness between DB21MT-5 and the Moritella reference strains were significantly lower than that accepted as the phylogenetic definition of a species. Based on this and other taxonomic differences, strain DB21MT-5 appears to represent a novel obligately barophilic deep-sea Moritella species. The name Moritella yayanosii (JCM 10263) is proposed. This is the first proposed species of obligately barophilic bacteria of the genus Moritella.

Key words Extremely barophilic bacteria Deep Sea Shewanella benthica Moritella yayanosii Mariana Trench 

Copyright information

© Springer-Verlag Tokyo 1999

Authors and Affiliations

  • Y. Nogi
    • 1
  • Chiaki Kato
    • 1
  1. 1.The DEEP STAR group, Japan Marine Science and Technology Center, 2-15 Natsushima-cho, Yokosuka 237-0061, Japan Tel. +81-468-67-5555; Fax +81-468-66-6364 e-mail: nogiy@jamstec.go.jpJP

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