Characterization of the marine propionate-degrading, sulfate-reducing bacterium sp. nov. and reclassification of as comb. nov. Free

Abstract

A rod-shaped, slightly curved sulfate reducer, designated strain P2, was isolated from the sulfate–methane transition zone of a marine sediment. Cells were motile by means of a single polar flagellum. The strain reduced sulfate, thiosulfate and sulfite to sulfide and used propionate, lactate and 1-propanol as electron donors. Strain P2 also grew by fermentation of lactate. Propionate was oxidized incompletely to acetate and CO. The DNA G+C content was 48·8mol%. Sequence analysis of the small-subunit rDNA and the dissimilatory sulfite reductase gene revealed that strain P2 was related to the genera , , , ‘’, , and . These genera include incomplete as well as complete oxidizers of substrates. Strain P2 shared important morphological and physiological traits with and , including the ability to oxidize propionate incompletely to acetate. The 16S rRNA gene similarities of P2 to and were respectively 92·9 and 91·5%. Combining phenotypic and genotypic traits, we propose strain P2 to be a member of the genus . The name sp. nov. (type strain P2=DSM 15249=ATCC BAA-815) is proposed, reflecting the limited number of substrates consumed by the strain. In addition, the reclassification of as a member of the genus , comb. nov., is proposed. A common line of descent and a number of shared phenotypic traits support this reclassification.

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2004-03-01
2024-03-29
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