Methanogenesis at extremely haloalkaline conditions in the soda lakes of Kulunda Steppe (Altai, Russia)

FEMS Microbiology Ecology
Dimitry Y SorokinMark van Loosdrecht

Abstract

Microbial methanogenesis at extreme conditions of saline alkaline soda lakes has, so far, been poorly investigated. Despite the obvious domination of sulfidogenesis as the therminal anaerobic process in the hypersaline soda lakes of Kulunda Steppe (Altai, southwestern Siberia), high concentrations of methane were detected in the anaerobic sediments. Potential activity measurements with different substrates gave results significantly deviating from what is commonly found in hypersaline habitats with neutral pH. In particular, not only a non-competitive methylotrophic pathway was active, but also lithotrophic and, in some cases, even acetate-dependent methanogenesis was found to be present in hypersaline soda lake sediments. All three pathways were functioning exclusively within the alkaline pH range between 8 and 10.5, while the salt concentration was the key factor influencing the activity. Methylotrophic and, to a lesser extent, lithotrophic methanogenesis were active up to soda-saturating conditions (4 M total Na(+)). Acetate-dependent methanogenesis was observed at salinities below 3 M total Na(+). Detection of methanogens in sediments using the mcrA gene as a functional marker demonstrated domination of methylotrophic gener...Continue Reading

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Citations

Mar 13, 2016·Trends in Biotechnology·Matthijs R J DaelmanMarc Strous
Aug 1, 2015·International Journal of Systematic and Evolutionary Microbiology·Dimitry Y SorokinMark C M van Loosdrecht
May 31, 2015·Current Opinion in Microbiology·Dimitry Y SorokinGerard Muyzer
Jun 16, 2015·Archaea : an International Microbiological Journal·Yendi E Navarro-NoyaLuc Dendooven
Dec 3, 2016·International Journal of Systematic and Evolutionary Microbiology·Dimitry Y Sorokin, Nikolai A Chernyh
Mar 7, 2018·Canadian Journal of Microbiology·Patricia RojasJosé L Sanz
Sep 12, 2015·Applied Microbiology and Biotechnology·João A B SousaAlfons J M Stams
Jul 23, 2020·International Journal of Systematic and Evolutionary Microbiology·Daria G ZavarzinaIlya V Kublanov
Oct 20, 2018·Frontiers in Microbiology·Dimitry Y SorokinMichail M Yakimov
Apr 2, 2019·Frontiers in Microbiology·Nicole J BaleJaap S Sinninghe Damsté
Sep 19, 2019·Nature Communications·Jackie K ZorzMarc Strous
Dec 22, 2020·Frontiers in Microbiology·Richard M WormaldPaul N Humphreys
Dec 21, 2016·Environmental Science & Technology·João A B SousaCaroline M Plugge

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