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Int J Syst Evol Microbiol 56 (2006), 1495-1499; DOI  10.1099/ijs.0.64074-0
© 2006 International Union of Microbiological Societies

Reclassification of the sulfate- and nitrate-reducing bacterium Desulfovibrio vulgaris subsp. oxamicus as Desulfovibrio oxamicus sp. nov., comb. nov.

Alejandro López-Cortés1, Marie-Laure Fardeau2, Guy Fauque2,3, Catherine Joulian4 and Bernard Ollivier2

1 Laboratorio de Ecología Microbiana Molecular, Centro de Investigaciones Biológicas del Noroeste (CIBNOR), Mar Bermejo 195, Playa Palo Santa Rita, La Paz, Baja California Sur, 23090, Mexico
2 Laboratoire de Microbiologie IRD, Universités de Provence et de la Méditerranée, 163 avenue de Luminy, ESIL-GBMA, Case 925, 13288 Marseille Cedex 9, France
3 Laboratoire de Microbiologie, Géochimie et Ecologie Marines, UMR CNRS 6117, Campus de Luminy, Case 901, 13288 Marseille Cedex 9, France
4 BRGM, Environment and Process Division, Biotechnology Unit, 2, avenue Claude Guillemin, 45060 Orléans Cedex 2, France

Correspondence
Bernard Ollivier
ollivier{at}esil.univ-mrs.fr

Desulfovibrio vulgaris subsp. oxamicus (type strain, DSM 1925T) was found to use nitrate as a terminal electron acceptor, the latter being reduced to ammonium. Phylogenetic studies indicated that strain DSM 1925T was distantly related to the type strain of Desulfovibrio vulgaris (95.4 % similarity of the small-subunit rRNA gene) and had as its closest phylogenetic relatives two other nitrate- and sulfate-reducing bacteria, namely Desulfovibrio termitidis (99.4 % similarity) and Desulfovibrio longreachensis (98.4 % similarity). Additional experiments were conducted to characterize better strain DSM 1925T. This strain incompletely oxidized lactate and ethanol to acetate. It also oxidized butanol, pyruvate and citrate, but not glucose, fructose, acetate, propionate, butyrate, methanol, glycerol or peptone. The optimum temperature for growth was 37 °C (range 16–50 °C) and the optimum NaCl concentration for growth was 0.1 % (range 0–5 %). Because of significant genotypic and phenotypic differences from Desulfovibrio termitidis and Desulfovibrio longreachensis, reclassification of Desulfovibrio vulgaris subsp. oxamicus as Desulfovibrio oxamicus sp. nov., comb. nov., is proposed. The type strain is strain Monticello 2T (=DSM 1925T=NCIMB 9442T=ATCC 33405T).

Abbreviations: SRB, sulfate-reducing bacteria; SSU, small subunit

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of Desulfovibrio oxamicus DSM 1925T is DQ122124.






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