Ferrihydrite Addition Activated Geobacteraceae, the Most Abundant Iron-reducing Diazotrophs, and Suppressed Methanogenesis by Heterogeneous Methanogens in Xylan-amended Paddy Soil Microcosms

Paddy fields are a major emission source of the greenhouse gas methane. In the present study, the addition of ferrihydrite to xylan-amended paddy soil microcosms suppressed methane emissions. PCR-based and metatranscriptomic ana­lyses revealed that the addition of ferrihydrite suppressed methanogene...

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Bibliographic Details
Published in:Microbes and Environments 2024, Vol.39(3), pp.ME24028
Main Authors: Masuda, Yoko, Chihara, Mitsutaka, Senoo, Keishi
Format: Article
Language:English
Subjects:
ferrihydrite
iron-reducing diazotrophs
metatranscriptome
methanogenesis
paddy field soil
Short Communication
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Summary:Paddy fields are a major emission source of the greenhouse gas methane. In the present study, the addition of ferrihydrite to xylan-amended paddy soil microcosms suppressed methane emissions. PCR-based and metatranscriptomic ana­lyses revealed that the addition of ferrihydrite suppressed methanogenesis by heterogeneous methanogens and simultaneously activated Geobacteraceae, the most abundant iron-reducing diazotrophs. Geobacteraceae may preferentially metabolize xylan and/or xylan-derived carbon compounds that are utilized by methanogens. Geomonas terrae R111 utilized xylan as a growth substrate under liquid culture conditions. This may constitute a novel mechanism for the mitigation of methane emissions previously observed in ferric iron oxide-applied paddy field soils.
ISSN:1342-6311
1347-4405
DOI:10.1264/jsme2.ME24028