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
Citations
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References
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Journal ArticleDOI
Competitive interactions between methane- and ammonia-oxidizing bacteria modulate carbon and nitrogen cycling in paddy soil
TL;DR: Using DNA-based stable isotope probing and pyrosequencing of 16S rRNA and functional genes, this paper reported on biogeochemical and molecular evidence for growth stimulation of methanotrophic communities by ammonium fertilization, and that methane modulates nitrogen cycling by competitive inhibition of nitrifying communities in a rice paddy soil.
Journal ArticleDOI
Methanol Improves Methane Uptake in Starved Methanotrophic Microorganisms
TL;DR: Methanotrophs in enrichment cultures grew and sustained atmospheric methane oxidation when supplied with methanol and were dependent on a supply of methnol upon reduced methane access but only when exposed to a methane-free atmosphere.
Journal ArticleDOI
Influence of the Endogenous Storage Lipid Poly-β-Hydroxybutyrate on the Reducing Power Availability during Cometabolism of Trichloroethylene and Naphthalene by Resting Methanotrophic Mixed Cultures
Tomas Henrysson,Perry L. McCarty +1 more
TL;DR: The role of the storage lipid poly-beta-hydroxybutyrate (PHB) in trichloroethylene transformation by methanotrophic mixed cultures was investigated and a positive correlation between the amount of PHB in the cells and the naphthalene oxidation rate as well as between PHB and the trich chloro methylene transformation rate and capacity was found.
Journal ArticleDOI
Microbial CH4 and N2O Consumption in Acidic Wetlands
Steffen Kolb,Marcus A. Horn +1 more
TL;DR: Acidic wetlands are global sources of the atmospheric greenhouse gases methane (CH4), and nitrous oxide (N2O), and analyses of the composition of N2O reductase genes in acidic wetlands suggest that acid-tolerant Proteobacteria have the potential to mediate N 2O consumption in such soils.
Journal ArticleDOI
Macroecology of methane-oxidizing bacteria: the β-diversity of pmoA genotypes in tropical and subtropical rice paddies
Claudia Lüke,Claudia Lüke,Peter Frenzel,Adrian Ho,Dian Fiantis,Peter Schad,Bellinda Schneider,Lorenz Schwark,Lorenz Schwark,Sri Rahayu Utami +9 more
TL;DR: The methanotroph community in paddysoils sampled in Indonesia, Vietnam, China and Italy is compared, focusing on the distance–decay relationship, to propose historical contingencies being responsible for the observed patterns.
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