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Appl Environ Microbiol, April 1998, p. 1510-1513, Vol. 64, No. 4
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Extremely Barophilic Bacteria Isolated from the Mariana Trench, Challenger Deep, at a Depth of 11,000 Meters

Chiaki Kato,* Lina Li, Yuichi Nogi, Yuka Nakamura, Jin Tamaoka, and Koki Horikoshi

The Deep Star Group, Japan Marine Science and Technology Center Yokosuka 237, Japan

Received 19 November 1997/Accepted 2 February 1998

Two strains of obligately barophilic bacteria were isolated from a sample of the world's deepest sediment, which was obtained by the unmanned deep-sea submersible Kaiko in the Mariana Trench, Challenger Deep, at a depth of 10,898 m. From the results of phylogenetic analysis based on 16S rRNA gene sequences, DNA-DNA relatedness study, and analysis of fatty acid composition, the first strain (DB21MT-2) appears to be most highly similar to Shewanella benthica and close relatives, and the second strain (DB21MT-5) appears to be closely related to the genus Moritella. The optimal pressure conditions for growth of these isolates were 70 MPa for strain DB21MT-2 and 80 MPa for strain DB21MT-5, and no growth was detected at pressures of less than 50 MPa with either strain. This is the first evidence of the existence of an extreme-barophile bacterium of the genus Moritella isolated from the deep-sea environment.

* Corresponding author. Mailing address: The Deep Star Group, Japan Marine Science and Technology Center, 2-15 Natsushima-cho, Yokosuka 237, Japan. Phone: 81-468-67-5555. Fax: 81-468-66-6364. E-mail: katoc{at}jamstec.go.jp.




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