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Volume 63, Issue Pt_3

gen. nov., sp. nov., a psychrophilic sulfate-reducing bacterium isolated from a permanently cold marine sediment Free

Abstract

A sulfate-reducing bacterium, designated JHA1, was isolated from a permanently cold marine sediment sampled in an Artic fjord on the north-west coast of Svalbard. The isolate was originally enriched at 4 °C in a highly diluted liquid culture amended with hydrogen and sulfate. Strain JHA1 was a psychrophile, growing fastest between 14 and 16 °C and not growing above 20 °C. Fastest growth was found at neutral pH (pH 7.2–7.4) and at marine concentrations of NaCl (20–30 g l). Phylogenetic analysis of 16S rRNA gene sequences revealed that strain JHA1 was a member of the family in the . The isolate shared 99 % 16S rRNA gene sequence similarity with an environmental sequence obtained from permanently cold Antarctic sediment. The closest recognized relatives were DSM 3384 and DSM 7467 (both <95 % sequence similarity). In contrast to its closest phylogenetic relatives, strain JHA1 grew chemolithoautotrophically with hydrogen as an electron donor. CO dehydrogenase activity indicated the operation of the reductive acetyl-CoA pathway for inorganic carbon assimilation. Beside differences in physiology and morphology, strain JHA1 could be distinguished chemotaxonomically from the genus by the absence of the cellular fatty acid C 10-methyl. Phylogenetic differentiation from other genera was further supported by DsrAB and AprBA sequence analysis. Based on the described phylogenetic and phenotypic differences between strain JHA1 and its closest relatives, the establishment of a novel genus and a novel species, gen. nov., sp. nov. is proposed. The type strain is JHA1 ( = DSM 21856  = JCM 16085).

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Funding
This study was supported by the:
  • Max-Planck Society
© 2013 IUMS
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2013-03-01
2024-04-18
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Desulfoconvexum algidum gen. nov., sp. nov., a psychrophilic sulfate-reducing bacterium isolated from a permanently cold marine sediment
Int J Syst Evol Microbiol 63, 959 (2013); https://doi.org/10.1099/ijs.0.043703-0
/content/journal/ijsem/10.1099/ijs.0.043703-0
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