1887

Abstract

An anaerobic, mesophilic, syntrophic, propionate-oxidizing bacterium, strain MGP, was isolated as a defined co-culture with from the methanogenic sludge of a mesophilic upflow anaerobic sludge blanket (UASB) reactor. The strain grew in the presence of propionate, but only in co-culture with methanogens, suggesting that it is an obligately syntrophic bacterium. The optimum temperature for growth was 37 °C, and the optimum pH was between 6.5 and 7.2. Based on comparative 16S rRNA gene sequence analysis, strain MGP was affiliated with subcluster Ih of ‘ cluster I’, in which it was found to be moderately related to known species of the genera and . Similar to known species of the genus , strain MGP could degrade propionate in syntrophy, but had no ability to reduce sulfate, sulfite and thiosulfate. Further phenotypic and genetic studies supported the affiliation of the strain as a novel species in this genus, for which the name sp. nov. is proposed. The type strain is MGP (=DSM 15578=JCM 11929). The strain has been deposited in the DSM and JCM culture collections as a defined co-culture with .

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2007-07-01
2020-08-08
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