Aug 1, 2006

Cultivation of methanogens from shallow marine sediments at Hydrate Ridge, Oregon

Archaea : an International Microbiological Journal
Melissa M Kendall, David R Boone

Abstract

Little is known about the methanogenic degradation of acetate, the fate of molecular hydrogen and formate or the ability of methanogens to grow and produce methane in cold, anoxic marine sediments. The microbes that produce methane were examined in permanently cold, anoxic marine sediments at Hydrate Ridge (44 degrees 35' N, 125 degrees 10' W, depth 800 m). Sediment samples (15 to 35 cm deep) were collected from areas of active methane ebullition or areas where methane hydrates occurred. The samples were diluted into enrichment medium with formate, acetate or trimethylamine as catabolic substrate. After 2 years of incubation at 4 degrees C to 15 degrees C, enrichment cultures produced methane. PCR amplification and sequencing of the rRNA genes from the highest dilutions with growth suggested that each enrichment culture contained a single strain of methanogen. The level of sequence similarity (91 to 98%) to previously characterized prokaryotes suggested that these methanogens belonged to novel genera or species within the orders Methanomicrobiales and Methanosarcinales. Analysis of the 16S rRNA gene libraries from DNA extracted directly from the sediment samples revealed phylotypes that were either distantly related to cultivat...Continue Reading

Mentioned in this Paper

Sediments, Marine
Hyrex Brand of Dimenhydrinate
Methane
Methanomicrobiales
Catabolic Process
Archaea
Gene Amplification Technique
Phylogeny
Methanobacteria
Formates

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