Organohalide respiration in the subseafloor microbial ecosystem-Investigation of RDH genes and dehalogenation activity

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Halogenated organic matter incorporated in marine sediments is one source of electron acceptors for anaerobic microbial respiration. A total of 32 putative reductive dehalogenase homologous genes 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 358.6 m below the seafloor. In addition, dehalogenation activity toward 2,4,6-tribromophenol, 2,4,6-triiodophenol, 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.