title: Response of the rumen archaeal and bacterial populations to anti-methanogenic organosulphur compounds in continuous-culture fermenters.
abstract: Study of the efficacy of methanogenesis inhibitors in the rumen has given inconsistent results, mainly due to poorly understood effects on the key microbial groups involved in pathways for methane (CH4) synthesis. The experiment described in this report was designed to assess the effect of propyl propane thiosulfinate (PTS), diallyl disulfide (DDS) and bromochloromethane (BCM) on rumen fermentation, methane production and microbial populations in continuous culture fermenters. No effects on total volatile fatty acids (VFA) were observed with PTS or DDS, but VFA were decreased with BCM. Amylase activity increased with BCM as compared with the other treatments. A decrease in methane production was observed with PTS (48%) and BCM (94%) as compared with control values. The concentration of methanogenic archaea decreased with BCM from day 4 onward and with PTS on days 4 and 8. Pyrosequencing analysis revealed that PTS and BCM decreased the relative abundance of Methanomicrobiales and increased that of Methanobrevibacter and Methanosphaera. The total concentration of bacteria was not modified by any treatment, although treatment with BCM increased the relative abundance of Prevotella and decreased that of Ruminococcus. These results suggest that the inhibition of methane production in the rumen by PTS and BCM is associated with a shift in archaeal biodiversity and changes in the bacterial community with BCM.
authors.affiliation: Animal Nutrition, Estación Experimental del Zaidín (CSIC). C/Camino del Jueves s/n, Armilla, 18100, Granada, Spain CSIRO, Agriculture Flagship, Queensland Bioscience Precinct, 306 Carmody Road, St. Lucia, QLD, Australia.
authors.forename: Gonzalo
authors.initials: G
authors.lastname: Martínez-Fernández
authors.affiliation: Animal Nutrition, Estación Experimental del Zaidín (CSIC). C/Camino del Jueves s/n, Armilla, 18100, Granada, Spain.
authors.forename: Leticia
authors.initials: L
authors.lastname: Abecia
authors.affiliation: Animal Nutrition, Estación Experimental del Zaidín (CSIC). C/Camino del Jueves s/n, Armilla, 18100, Granada, Spain.
authors.forename: A Ignacio
authors.initials: AI
authors.lastname: Martín-García
authors.affiliation: Animal Nutrition, Estación Experimental del Zaidín (CSIC). C/Camino del Jueves s/n, Armilla, 18100, Granada, Spain.
authors.forename: Eva
authors.initials: E
authors.lastname: Ramos-Morales
authors.affiliation: CSIRO, Agriculture Flagship, Queensland Bioscience Precinct, 306 Carmody Road, St. Lucia, QLD, Australia.
authors.forename: Stuart E
authors.initials: SE
authors.lastname: Denman
authors.affiliation: IBERS, Aberystwyth University, Aberystwyth, UK.
authors.forename: Charles J
authors.initials: CJ
authors.lastname: Newbold
authors.affiliation: Animal Nutrition, Estación Experimental del Zaidín (CSIC). C/Camino del Jueves s/n, Armilla, 18100, Granada, Spain.
authors.forename: Eduarda
authors.initials: E
authors.lastname: Molina-Alcaide
authors.affiliation: Animal Nutrition, Estación Experimental del Zaidín (CSIC). C/Camino del Jueves s/n, Armilla, 18100, Granada, Spain david.yanez@eez.csic.es.
authors.forename: David R
authors.initials: DR
authors.lastname: Yáñez-Ruiz
mesh_terms: D000498:Allyl Compounds / Q000494:pharmacology; D000681:Amylases / Q000378:metabolism; D000818:Animals; D001105:Archaea / Q000378:metabolism*; D001419:Bacteria / Q000378:metabolism*; D004032:Diet; D004220:Disulfides / Q000494:pharmacology; D019605:Euryarchaeota / Q000378:metabolism; D005232:Fatty Acids, Volatile / Q000032:analysis; D005285:Fermentation; D006846:Hydrocarbons, Halogenated / Q000494:pharmacology; D008697:Methane / Q000096:biosynthesis / Q000378:metabolism*; D017013:Methanobacteriaceae / Q000378:metabolism; D041581:Methanobrevibacter / Q000378:metabolism; D017018:Methanomicrobiales / Q000378:metabolism; D059013:Microbial Consortia / Q000187:drug effects*; D018720:Prevotella / Q000378:metabolism; D012417:Rumen / Q000382:microbiology*; D045857:Ruminococcus / Q000378:metabolism
chemical_list: D000498:Allyl Compounds; D004220:Disulfides; D005232:Fatty Acids, Volatile; D006846:Hydrocarbons, Halogenated; C006811:bromochloromethane; C028009:diallyl disulfide; D000681:Amylases; D008697:Methane
keywords: garlic compounds; methanogens; microbial community; rumen