Conventional methanotrophs are responsible for atmospheric methane oxidation in paddy soils.
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TLDR
The induction of HAMO activity occurred only after the rapid growth of methanotrophic populations, and a metatranscriptome-wide association study suggests that the concurrent high- and low-affinity methane oxidation was catalysed by known meethanotrophs rather than by the proposed novel atmospheric methane oxidizers.Abstract:
Soils serve as the biological sink of the potent greenhouse gas methane with exceptionally low concentrations of ∼1.84 p.p.m.v. in the atmosphere. The as-yet-uncultivated methane-consuming bacteria have long been proposed to be responsible for this 'high-affinity' methane oxidation (HAMO). Here we show an emerging HAMO activity arising from conventional methanotrophs in paddy soil. HAMO activity was quickly induced during the low-affinity oxidation of high-concentration methane. Activity was lost gradually over 2 weeks, but could be repeatedly regained by flush-feeding the soil with elevated methane. The induction of HAMO activity occurred only after the rapid growth of methanotrophic populations, and a metatranscriptome-wide association study suggests that the concurrent high- and low-affinity methane oxidation was catalysed by known methanotrophs rather than by the proposed novel atmospheric methane oxidizers. These results provide evidence of atmospheric methane uptake in periodically drained ecosystems that are typically considered to be a source of atmospheric methane.read more
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References
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Journal ArticleDOI
Laboratory study of methane oxidation in paddy soils
Yan Xiao-Yuan,Zu-Cong Cai +1 more
TL;DR: In this article, the authors investigated Methane oxidation in paddy soils under laboratory conditions and found that the soil with the maximum potential to produce CH4, also had the maximum CH4 oxidation activity and maximum emission flux from paddy soil.
Journal Article
Next generation sequencing and stable isotope probing of active microorganisms responsible for aerobic methane oxidation in red paddy soils
Yan Zheng,Zhongjun Jia +1 more
TL;DR: High-throughput pyrosequencing at the whole community level of 16S rRNA genes provides an almost unbiased profiling stragety for measuring characteristic changes in relative proportions of aerobic methanotrophs responsible for aerobic methane oxidation activity in red paddy soils, and higher sensitivity was observed at RNA than DNA levels.
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