Desulfovibrio longreachii sp. nov., a sulfate-reducing bacterium isolated from the Great Artesian Basin of Australia

A new mesophilic, thermotolerant sulfate-reducing bacterium, was isolated from the flowing bore waters of a deep aquifer, the Great Artesian Basin, Australia. The strain, designated isolate AB16910a, is a curved rod and resembled members of the genus Desulfovibrio. However, the isolate can be differentiated from other members of the Desulfovibrio species because of the high G+C content of 69±0.25% the 16S rRNA sequence data and other physiological characteristics. The name Desulfovibrio longreachii is proposed for the new isolate

Phylogenetic analysis of Desulfotomaculum thermobenzoicum using polymerase chain reaction-amplified 16S rRNA-specific DNA

The 16S rRNA gene of the thermophilic sulfate-reducing bacterium Desulfotomaculum thermobenzoicum was amplified by polymerase chain reaction using two eubacterial consensus oligodeoxynucleotide primers flanking the majority of the 16S rRNA gene, cloned, and sequenced. Phylogenetic analysis revealed that D. thermobenzoicum belongs to the Gram-positive (low G + C content) branch and is more related to the thermophilic sulfate-reducing bacterium, D. australicum than the moderate thermophile D. nigrificans, or the mesophiles D. orientis, and D. ruminis. This relationship is further strengthened by the presence of an unusual idiosyncrasy in helix 6 of the 16S rRNA gene of D. thermobenzoicum resembling that of D. australicum but not found in other desulfotomacula species and in any other bacteria sequenced to date