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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 degrees 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, H(2) and CO(2). 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.

international journal of systematic and evolutionary microbiology

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