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1 School of Earth, Ocean and Planetary Sciences, Cardiff University, Main Building, Park Place, Cardiff CF10 3YE, UK
2 Division of Biological Sciences, University of Montana, Missoula, MT 59812-4824, USA
3 Department of Geology, University of Montana, Missoula, MT 59812, USA
4 DSMZ – Deutsche Sammlung von Mikroorganismen und Zellkulturen GmbH, Inhoffenstraße 7B, D-38124 Braunschweig, Germany
Correspondence
R. F. Rosenzweig
Frank.Rosenzweig{at}mso.umt.edu
Two novel sulfate-reducing bacteria, strains CY1T and CY2, were isolated from heavy-metal-contaminated sediments of Lake Coeur d'Alene, Idaho, USA. Strains CY1T and CY2 were found to contain c-type cytochromes and to reduce sulfate, sulfite, thiosulfate, elemental sulfur, DMSO, anthraquinone disulfonate and fumarate using lactate as an electron donor. In a comparison of 16S rRNA gene sequences, CY1T and CY2 were found to be 100 % identical, but only 97 and 92.4 % similar, respectively, to the type strains of Desulfovibrio mexicanus and Desulfovibrio aminophilus. Unlike these species, however, CY1T was neither able to disproportionate thiosulfate nor able to use yeast extract or amino acids as electron donors. These data, considered in conjunction with differences among strain CY1T and the two related type strains in chemotaxonomy, riboprint patterns, temperature and pH optima, support recognition of a distinct and novel species within the genus Desulfovibrio, Desulfovibrio idahonensis sp. nov., with the type strain CY1T (=DSM 15450T =JCM 14124T).
The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of strains CY1T and CY2 are AJ582755 and AJ582758, respectively.
An electron micrograph of a cell of strain CY1T and PvuII riboprints of the novel strains and D. mexicanus DSM 13116T are available as supplementary material with the online version of this paper.
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