1887

Abstract

A novel spore-forming, sulfate-reducing bacterium, strain SR45, was isolated from sediment of a freshwater lake, Lake Mizugaki, in Japan. Cells of strain SR45 were rod-shaped (1.0–1.5×2.0–5.0 µm) and weakly motile; Gram staining and the KOH lysis test were negative. For growth, the optimum pH was 6.4–6.8 and the optimum temperature was 42–45 °C. Strain SR45 used sulfate, thiosulfate, sulfite and elemental sulfur as electron acceptors but not Fe(III). The G+C content of the genomic DNA was 41.1 mol%. Phylogenetic analyses based on genes for the 16S rRNA and DNA gyrase () revealed that the isolated strain belonged to the family in the class . The closest relative is 5575, with 16S rRNA gene sequence similarity of 92–94 %. It is suggested that the strain is the second isolated member of subcluster Ie. The isolate had multiple 16S rRNA gene copies, with 13 different sequences. On the basis of phylogenetic and phenotypic characterization, the name sp. nov. is proposed, with the type strain SR45 ( = NBRC 109411 = DSM 26801).

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2013-10-01
2019-10-14
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