Desulfonatronovibrio halophilus sp nov., a novel moderately halophilic sulfate-reducing bacterium from hypersaline chloride-sulfate lakes in Central Asia

作者：Sorokin D Y^*; Tourova T P; Abbas B; Suhacheva M V; Muyzer G

来源：Extremophiles, 2012, 16(3): 411-417.

DOI：10.1007/s00792-012-0440-5

• Sulfate-reducing bacteria (SRB)
• Desulfonatronovibrio
• Hypersaline lakes
• Halophilic

Four strains of lithotrophic sulfate-reducing bacteria (SRB) have been enriched and isolated from anoxic sediments of hypersaline chloride-sulfate lakes in the Kulunda Steppe (Altai, Russia) at 2 M NaCl and pH 7.5. According to the 16S rRNA gene sequence analysis, the isolates were closely related to each other and belonged to the genus , which, so far, included only obligately alkaliphilic members found exclusively in soda lakes. The isolates utilized formate, H-2 and pyruvate as electron donors and sulfate, sulfite and thiosulfate as electron acceptors. In contrast to the described species of the genus , the salt lake isolates could only tolerate high pH (up to pH 9.4), while they grow optimally at a neutral pH. They belonged to the moderate halophiles growing between 0.2 and 2 M NaCl with an optimum at 0.5 M. On the basis of their distinct phenotype and phylogeny, the described halophilic SRB are proposed to form a novel species within the genus , (type strain HTR1(T) = DSM24312(T) = UNIQEM U802(T)).

• 出版日期2012-5