日本地球惑星科学連合2021年大会

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[E] 口頭発表

セッション記号 B (地球生命科学) » B-CG 地球生命科学複合領域・一般

[B-CG03] 地球惑星科学 生命圏フロンティア

2021年6月3日(木) 09:00 〜 10:30 Ch.26 (Zoom会場26)

コンビーナ:加藤 真悟(国立研究開発法人理化学研究所)、高野 淑識(海洋研究開発機構)、鈴木 庸平(東京大学大学院理学系研究科)、福士 圭介(金沢大学環日本海域環境研究センター)、座長:福士 圭介(金沢大学環日本海域環境研究センター)、鈴木 庸平(東京大学大学院理学系研究科)

10:15 〜 10:30

[BCG03-05] Microbial community and its functions on methane metabolism in the wetland ecosystems

*Wipoo Prasitwuttisak1、Katsunori Yanagawa1 (1.The University of Kitakyushu)


キーワード:Wetland, Microbial community, Methane metabolism, Methanogen, Carbon cycle

Wetland ecosystems have been certified as the main natural source of atmospheric methane, the potent greenhouse gas that influences global climate and carbon fluxes. The metabolism of methane in a wetland environment is carried out by a diverse group of methane-metabolizing archaea through the biological decomposition of organic matter under anaerobic conditions. Recently, cultivation-independent genomic approaches are allowing us to explore genomic diversity and expand our understanding of the unidentified microbial lineages on their ecological lifestyles. However, clear evidence for methane metabolism and the functional methanogenic community is yet to be much documented. In this work, we characterized the microbial community structures in peats collected from the Bogatsuru Wetland, Oita Prefecture, Japan. The phylogenetic analysis based on 16S rRNA gene sequences and functional genes were used for investigating the key microbial groups and activity potentially involved with the metabolic pathways for methane production. The members of Methanomicrobia (mainly Methanomicrobiales and Methanosarcinales) were detected in anoxic sub-surface peat corresponded to the existence of the mcrA gene, a key functional gene for methanogenic archaea, indicating the methane production potentials. Additionally, the phylogenetic analyses of functional genes revealed that the Methanomassiliicoccales lineages, classified H2-dependent methylotrophic archaea, were also detected from deeper peat. Interestingly, uncultured methanogenic Bathyarchaeota, the proposed methylotrophic methanogens, and unrecognized terrestrial archaeon were highly observed in this study. These findings emphasize the importance of discovering members of the methanogenic archaea in order to understand the ecological diversity and metabolic functions that play a vital role in the global carbon cycle.