A sulfate-reducing bacterium, designated strain lac, was isolated from surface-sterilized roots of the benthic macrophyte . Cells were motile by means of a single polar flagellum. Strain lacutilized lactate, pyruvate, malate, ethanol, -alanine, fumarate, choline and fructose with sulfate as electron acceptor. In addition, fumarate, pyruvate and fructose were also degraded without an external electron acceptor. Sulfate could be substituted with thiosulfate, sulfite and elemental sulfur. Optimal growth was observed between 32·5 and 34·5 °C, at an NaCl concentration of 0·2 M and in a pH range between 6·8 and 7·3. The G+C content of the DNA was 42·7±0·2 mol%. Desulfoviridin and catalase were present. Strain laccontained c-type cytochromes. Comparative 16S rRNA gene sequence analysis and the fatty acid pattern grouped this isolate into the genus . However, strain lacdiffers from all other described species on the bases of its 16S rRNA gene sequence, the G+C content, its cellular lipid pattern and the utilization pattern of substrates. These characteristics establish strain lac(= DSM 11974) as a novel species of the genus , for which the name sp. nov. is proposed.


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