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Desulfocella halophila gen. nov., sp. nov., a halophilic, fatty-acid-oxidizing, sulfate-reducing bacterium isolated from sediments of the Great Salt Lake

¹Department of Microbial Ecology, Institute of Biological Sciences, University of Aarhus, Ny Munkegade, Building 540, DK-8000 Aarhus C, Denmark
²Faculty of Science and Technology, Griffith University, Nathan, Brisbane 4111, Australia

Author for correspondence: Kjeld Ingvorsen. Tel: +45 89 42 32 45. Fax: +45 86 12 71 91. e-mail: Kjeld.Ingvorsen{at}biology.aau.dk

ABSTRACT

A new halophilic sulfate-reducing bacterium, strain GSL-But2^T, was isolated from surface sediment of the Southern arm of the Great Salt Lake, UT, USA. organism grew with a number of straight-chain fatty acids (C₄-C₁₆), 2-methylbutyrate, L-alanine and pyruvate as electron donors. Butyrate was oxidized incompletely to acetate. Sulfate, but not sulfite or thiosulfate, serv as an electron acceptor. Growth was observed between 2 and 19% (w/v) NaCl with an optimum at 4-5% (w/v) NaCl. The optimal temperature and pH for growth were around 34°C and pH 6.5-7.3, respectively. The generation time under optimal conditions in defined medium was around 28 h, compared to 20 h in complex medium containing yeast extract. The G+C content was 35.0 mol%. 16S rRNA gene sequence analysis revealed that strain GSL-But2^Tbelongs to the family Desulfobacteriaceae within the delta-subclass of the Proteobacteria and suggested that strain GSL-But2^Trepresents a member of new genus. The name Desulfocella halophila gen. nov., sp. nov. is proposed for this organism. The type strain of D. halophila is strain GSL-But2^T(= DSM 117 = ATCC 700426^T).

Key Words: Desulfocella halophila • halophilic sulfate-reducing bacteria • long-chain fatty acids • taxonomy

The GenBank accession number for the 16S rDNA sequence of strain GSL-But2^Tis AF022936.

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