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Department of Microbiology, Institute of Biological Sciences, University of Aarhus, Denmark
Correspondence
Kjeld Ingvorsen
kjeld.ingvorsen{at}biology.au.dk
A novel alkalitolerant, sulphate-reducing bacterium (strain RT2T) was isolated from alkaline district heating water. Strain RT2T was a motile vibrio (0.5–0.8 µm wide and 1.4–1.9 µm long) and grew at pH 6.9–9.9 (optimum at pH 9.0–9.4) and at 16–47 °C (optimum at 43 °C). The genomic DNA G+C content was 64.7 mol%. A limited number of compounds were used as electron donors with sulphate as electron acceptor, including lactate, pyruvate, formate and hydrogen/acetate. Sulphite and thiosulphate also served as electron acceptors. Based on physiological and genotypic properties, the isolate was considered to represent a novel species of the genus Desulfovibrio, for which the name Desulfovibrio alkalitolerans sp. nov. is proposed. The type strain is RT2T (=DSM 16529T=JCM 12612T). The strain is the first alkali-tolerant member of the genus Desulfovibrio to be described.
The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA, dsrAB and apsA gene sequences of strain RT2T are AY649785, AY864856 and AY744465, respectively.
A transmission electron photomicrograph of a cell of strain RT2T grown on lactate with sulphate as the electron acceptor and consensus trees showing the phylogenetic affiliations of the DsrAB and ApsA amino acid sequences of strain RT2T are available as supplementary material in IJSEM Online.
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