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Int J Syst Evol Microbiol 57 (2007), 2360-2364; DOI  10.1099/ijs.0.64781-0
© 2007 International Union of Microbiological Societies

Desulfothermus okinawensis sp. nov., a thermophilic and heterotrophic sulfate-reducing bacterium isolated from a deep-sea hydrothermal field

Takuro Nunoura, Hanako Oida, Masayuki Miyazaki, Yohey Suzuki, Ken Takai and Koki Horikoshi

Subground Animalcule Retrieval (SUGAR) Program, Extremobiosphere Research Center, Japan Agency for Marine-Earth Science & Technology (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan

Correspondence
Takuro Nunoura
takuron{at}jamstec.go.jp

A novel thermophilic and heterotrophic sulfate-reducing bacterium, strain TFISO9T, was isolated from a deep-sea hydrothermal field at the Yonaguni Knoll IV in the Southern Okinawa Trough. The cells were motile rods 2.5–5.0 µm in length and 0.6–0.9 µm in width. Strain TFISO9T was an obligate heterotroph and reduced sulfate. It grew between 35 and 60 °C (optimum 50 °C), at pH 5.4–7.9 (optimum pH 5.9–6.4) and with 1.5–4.5 % NaCl (optimum 2.5 %). The fatty acid composition was C16 : 0 (61.5 %) and 12Me16 : 0 (38.5 %). The DNA G+C content was 34.9 mol%. The 16S rRNA gene sequence analysis indicated that strain TFISO9T belonged to the genus Desulfothermus. Based on physiological and phylogenetic characteristics, strain TFISO9T represents a novel species for which the name Desulfothermus okinawensis sp. nov. is proposed. The type strain is TFISO9T (=JCM 13304T=DSM 17375T).

The GenBank/EMBL/DDBJ accession number for the 16S rRNA sequence of strain TFISO9T is AB264617.

An electron micrograph of a negatively stained cell of strain TFISO9T and a figure showing the effect of temperature and NaCl on growth of strain TFISO9T are available as supplementary material with the online version of this paper.






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Copyright © 2007 by the International Union of Microbiological Societies.