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Appl Environ Microbiol. 2009 Nov;75(21):6905-9. doi: 10.1128/AEM.01124-09. Epub 2009 Sep 11.

Dehalogenation activities and distribution of reductive dehalogenase homologous genes in marine subsurface sediments.

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1
Geomicrobiology Group, Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology, Monobe B200, Nankoku, Kochi 783-8502, Japan.

Abstract

Halogenated organic compounds serve as terminal electron acceptors for anaerobic respiration in a diverse range of microorganisms. Here, we report on the widespread distribution and diversity of reductive dehalogenase homologous (rdhA) genes in marine subsurface sediments. A total of 32 putative rdhA phylotypes were detected in sediments from the southeast Pacific off Peru, the eastern equatorial Pacific, the Juan de Fuca Ridge flank off Oregon, and the northwest Pacific off Japan, collected at a maximum depth of 358 m below the seafloor. In addition, significant dehalogenation activity involving 2,4,6-tribromophenol and trichloroethene was observed in sediment slurry from the Nankai Trough Forearc Basin. These results suggest that dehalorespiration is an important energy-yielding pathway in the subseafloor microbial ecosystem.

PMID:
19749069
PMCID:
PMC2772448
DOI:
10.1128/AEM.01124-09
[Indexed for MEDLINE]
Free PMC Article
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