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Garciella nitratireducens gen. nov., sp. nov., an anaerobic, thermophilic, nitrate- and thiosulfate-reducing bacterium isolated from an oilfield separator in the Gulf of Mexico

¹ IRD, UR 101 Extrêmophiles, IFR-BAIM, Universités de Provence et de la Méditerranée, ESIL case 925, 163 avenue de Luminy, 13288 Marseille cedex 09, France
² Laboratorio de microscopía electrónica, Centro Nacional de Investigación y Capacitación Ambiental (CENICA), Universidad Autónoma Metropolitana, México, DF, Mexico
³ Programa de Biotecnología del Petróleo, Instituto Mexicano del Petróleo, México, DF, Mexico

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

A novel Gram-positive, anaerobic and thermophilic bacterium, strain MET79^T, was isolated from an oil well located in the Gulf of Mexico. Cells were straight rods, motile by a subpolar flagellum. Spores were formed in old cultures. Inner gas vacuoles swelled the cells when exposed to air. The optimum growth conditions were 55 °C, pH 7·5 and 1 % NaCl. Yeast extract was required for growth. Strain MET79^T fermented several sugars, some organic acids and Casamino acids. Glucose was fermented into lactate, acetate, butyrate, H₂ and CO₂. Strain MET79^T reduced thiosulfate to hydrogen sulfide and nitrate to ammonium. The DNA G+C content was 30·9 mol%. The closest phylogenetic relative of strain MET79^T was Caloranaerobacter azorensis (88·7 % 16S rDNA sequence similarity). As strain MET79^T (=DSM 15102^T=CIP 107615^T) was physiologically and phylogenetically different from its closest relatives, it is assigned as the type strain of a novel species of a new genus, Garciella nitratireducens gen. nov., sp. nov.

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