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Int J Syst Evol Microbiol 56 (2006), 2831-2836; DOI  10.1099/ijs.0.64356-0
© 2006 International Union of Microbiological Societies

Desulfitibacter alkalitolerans gen. nov., sp. nov., an anaerobic, alkalitolerant, sulfite-reducing bacterium isolated from a district heating plant

Marie Bank Nielsen, Kasper Urup Kjeldsen and Kjeld Ingvorsen

Department of Microbiology, University of Aarhus, Ny Munkegade Building 1540, DK-8000 Aarhus C, Denmark

Correspondence
Kjeld Ingvorsen
kjeld.ingvorsen{at}biology.au.dk

A novel alkalitolerant, anaerobic bacterium, designated strain sk.kt5T, was isolated from a metal coupon retrieved from a corrosion-monitoring reactor of a Danish district heating plant (Skanderborg, Jutland). The cells of strain sk.kt5T were motile, rod-shaped (0.4–0.6x2.5–9.6 µm), stained Gram-positive and formed endospores. Strain sk.kt5T grew at pH 7.6–10.5 (with optimum growth at pH 8.0–9.5), at temperatures in the range 23–44 °C (with optimum growth at 35–37 °C), at NaCl concentrations in the range 0–5 % (w/v) (with optimum growth at 0–0.5 %) and required yeast extract for growth. Only a limited number of substrates were utilized as electron donors, including betaine, formate, lactate, methanol, choline and pyruvate. Elemental sulfur, sulfite, thiosulfate, nitrate and nitrite, but not sulfate or Fe(III) citrate, were used as electron acceptors. The G+C content of the DNA was 41.6 mol%. Phylogenetic analyses of the sequence data for the dsrAB genes [encoding the major subunits of dissimilatory (bi)sulfite reductase] and the 16S rRNA gene placed strain sk.kt5T within a novel lineage in the class Clostridia of the phylum Firmicutes. Taken together, the physiological and genotypic data suggest that strain sk.kt5T represents a novel species within a novel genus, for which the name Desulfitibacter alkalitolerans gen. nov., sp. nov. is proposed. The type strain of Desulfitibacter alkalitolerans is sk.kt5T (=JCM 12761T=DSM 16504T).

The GenBank/EMBL/DDBJ accession numbers for the dsrAB and 16S rRNA gene sequences of strain sk.kt5T are AY538171 and AY751285, respectively.






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Copyright © 2006 by the International Union of Microbiological Societies.