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Applied and Environmental Microbiology, November 2009, p. 6905-6909, Vol. 75, No. 21
0099-2240/09/$08.00+0     doi:10.1128/AEM.01124-09
Copyright © 2009, American Society for Microbiology. All Rights Reserved.

Dehalogenation Activities and Distribution of Reductive Dehalogenase Homologous Genes in Marine Subsurface Sediments{triangledown} ,{dagger}

Taiki Futagami,1,2 Yuki Morono,1 Takeshi Terada,3 Anna H. Kaksonen,4,§ and Fumio Inagaki1*

Geomicrobiology Group, Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Monobe B200, Nankoku, Kochi 783-8502, Japan,1 Department of Bioscience and Biotechnology, Faculty of Agriculture, Kyushu University, Hakozaki 6-10-1, Fukuoka 812-8581, Japan,2 Marine Works Japan Ltd., Kamariya-higashi 2-16-32-5F, Yokohama 236-0042, Japan,3 Department of Chemistry and Bioengineering, Tampere University of Technology, FIN-33101 Tampere, Finland4

Received 15 May 2009/ Accepted 1 September 2009

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.

* Corresponding author. Mailing address: Geomicrobiology Group, Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Monobe B200, Nankoku, Kochi 783-8502, Japan. Phone: 81-88-878-2204. Fax: 81-88-878-2192. E-mail: inagaki{at}jamstec.go.jp

{triangledown} Published ahead of print on 11 September 2009.

{dagger} Supplemental material for this article may be found at http://aem.asm.org/.

§ Present address: Commonwealth Scientific and Industrial Research Organization (CSIRO), Land and Water, Underwood Ave., Floreat, WA 6014, Australia.

Applied and Environmental Microbiology, November 2009, p. 6905-6909, Vol. 75, No. 21
0099-2240/09/$08.00+0     doi:10.1128/AEM.01124-09
Copyright © 2009, American Society for Microbiology. All Rights Reserved.





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