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Desulfohalobium retbaense gen. nov., sp. nov., a Halophilic Sulfate-Reducing Bacterium from Sediments of a Hypersaline Lake in Senegal

¹Laboratoire de Microbiologie ORSTOM, UniversitÉ de Provence, 13331 Marseille CÉdex 3, France
²Laboratoire de Chimie Bacterienne, Centre National de la Recherche Scientifique, 13277 Marseille CÉdex 9, France
³Laboratoire de Microbiologie, UniversitÉ Blaise Pascal, 63177 Aubière, France
⁴Departement DERO/EP IFREMER, 29280 Plouzane, France

^* Corresponding author.

ABSTRACT

Sulfate-reducing bacterial strain HR₁₀₀ was isolated from sediments of Retba Lake, a pink hypersaline lake in Senegal. The cells were motile, nonsporulating, and rod shaped with polar flagella and incompletely oxidized a limited range of substrates to acetate and CO₂. Acetate and vitamins were required for growth and could be replaced by Biotrypcase or yeast extract. Sulfate, sulfite, thiosulfate, and elemental sulfur were used as electron acceptors and were reduced to H₂S. Growth occurred at pH values ranging from 5.5 to 8.0. The optimum temperature for growth was 37 to 40°C. NaCl and MgCl₂ were required for growth; the optimum NaCl concentration was near 10%. The guanine-plus-cytosine content of the DNA was 57.1 ± 0.2 mol%. On the basis of the morphological and physiological properties of this strain, we propose that it should be classified in a new genus, Desulfohalobium, which includes a single species, Desulfohalobium retbaense. The type strain is strain DSM 5692.

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