Coupled anaerobic methane oxidation and reductive arsenic mobilization in wetland soils

Shi, Ling-Dong; Guo, Ting; Lv, Pan-Long; Niu, Zi-Fan; Zhou, Yujie; Tang, Xianjin; Zheng, Ping; Zhu, Lizhong; Zhu, Yan; Kappler, Andreas; Zhao, He-Ping

doi:10.1038/s41561-020-00659-z

Cited by 96 publications

(49 citation statements)

References 69 publications

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“…“ Ca . Methanoperedens” have also been detected in environments without nitrate but with alternative electron acceptors such as metal-oxides, arsenate, and selenate ( Beal et al, 2009 ; Lu et al, 2016 ; Weber et al, 2017 ; Luo et al, 2018 ; Shi et al, 2020 ). Several studies reported AOM concomitant with the reduction of an extracellular electron acceptor in complex mixed cultures with “ Ca .…”

Section: Introductionmentioning

confidence: 99%

Methane-Dependent Extracellular Electron Transfer at the Bioanode by the Anaerobic Archaeal Methanotroph “Candidatus Methanoperedens”

et al. 2022

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Anaerobic methanotrophic (ANME) archaea have recently been reported to be capable of using insoluble extracellular electron acceptors via extracellular electron transfer (EET). In this study, we investigated EET by a microbial community dominated by “Candidatus Methanoperedens” archaea at the anode of a bioelectrochemical system (BES) poised at 0 V vs. standard hydrogen electrode (SHE), in this way measuring current as a direct proxy of EET by this community. After inoculation of the BES, the maximum current density was 274 mA m–2 (stable current up to 39 mA m–2). Concomitant conversion of 13CH4 into 13CO2 demonstrated that current production was methane-dependent, with 38% of the current attributed directly to methane supply. Based on the current production and methane uptake in a closed system, the Coulombic efficiency was about 17%. Polarization curves demonstrated that the current was limited by microbial activity at potentials above 0 V. The metatranscriptome of the inoculum was mined for the expression of c-type cytochromes potentially used for EET, which led to the identification of several multiheme c-type cytochrome-encoding genes among the most abundant transcripts in “Ca. Methanoperedens.” Our study provides strong indications of EET in ANME archaea and describes a system in which ANME-mediated EET can be investigated under laboratory conditions, which provides new research opportunities for mechanistic studies and possibly the generation of axenic ANME cultures.

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Section: Introductionmentioning

confidence: 99%

Methane-Dependent Extracellular Electron Transfer at the Bioanode by the Anaerobic Archaeal Methanotroph “Candidatus Methanoperedens”

et al. 2022

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“…Total dissolved organic carbon (DOC) was determined using a TOC Analyser (TOC‐Vcph, Shimadzu, Japan). Total iron (Fe) and manganese (Mn) were measured using quadrupole inductively coupled plasma mass spectroscopy (ICP‐MS, Thermo Elemental, X‐Series); while soluble iron in pore water was measured spectrophotometrically using phenanthroline under anaerobic condition (Shi et al ., 2020).…”

Section: Methodsmentioning

confidence: 99%

Anaerobic methane oxidation linked to Fe(III) reduction in a Candidatus Methanoperedens‐enriched consortium from the cold Zoige wetland at Tibetan Plateau

Chen

Zhang

et al. 2021

Environmental Microbiology

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Summary Anaerobic oxidation of methane (AOM) is a microbial process degrading ample methane in anoxic environments, and Ca. Methanoperedens mediated nitrate‐ or metal‐reduction linked AOM is believed important in freshwater systems. This work, via 16S rRNA gene diversity survey and 16S rRNA quantification, found abundant Ca. Methanoperedens along with iron in the cold Zoige wetland at Tibetan Plateau. The wetland soil microcosm performed Fe(III) reduction, rather than nitrate‐ nor sulphate‐reduction, coupled methane oxidation (3.87 μmol d−1) with 32.33 μmol Fe(II) accumulation per day at 18°C, but not at 30°C. A metagenome‐assembled genome (MAG) recovered from the microcosm exhibits ~74% average nucleotide identity with the reported Ca. Methanoperedens spp. that perform Fe(III) reduction linked AOM, thus a novel species Ca. Methanoperedens psychrophilus was proposed. Ca. M. psychrophilus contains the whole suite of CO2 reductive methanogenic genes presumably involving in AOM via a reverse direction, and comparative genome analysis revealed its unique gene categories: the multi‐heme clusters (MHCs) cytochromes, the S‐layer proteins highly homologous to those recovered from lower temperature environments and type IV pili, those could confer Ca. M. psychrophilus of cold adaptability. Therefore, this work reports the first methanotroph implementing AOM in an alpine wetland.

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“…On the contrary, heavy metals can inhibit enzymes by replacing metals in enzymes or altering the functional groups of protein molecules (Chen et al 2014 ). Additionally, heavy metals may produce cytotoxic compounds (Zayed and Winter 2000 ) that may permeate the cell wall and inhibit microorganisms, hence reducing the amount of methane produced during the fermentation process (Shi et al 2020 ). The inhibitory effect of heavy metals on the anaerobic digestion system is relative to their concentration, which regulates enzymatic synthesis (Liu et al 2021a ).…”

Section: Anaerobic Digestionmentioning

confidence: 99%

Biochar for agronomy, animal farming, anaerobic digestion, composting, water treatment, soil remediation, construction, energy storage, and carbon sequestration: a review

et al. 2022

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In the context of climate change and the circular economy, biochar has recently found many applications in various sectors as a versatile and recycled material. Here, we review application of biochar-based for carbon sink, covering agronomy, animal farming, anaerobic digestion, composting, environmental remediation, construction, and energy storage. The ultimate storage reservoirs for biochar are soils, civil infrastructure, and landfills. Biochar-based fertilisers, which combine traditional fertilisers with biochar as a nutrient carrier, are promising in agronomy. The use of biochar as a feed additive for animals shows benefits in terms of animal growth, gut microbiota, reduced enteric methane production, egg yield, and endo-toxicant mitigation. Biochar enhances anaerobic digestion operations, primarily for biogas generation and upgrading, performance and sustainability, and the mitigation of inhibitory impurities. In composts, biochar controls the release of greenhouse gases and enhances microbial activity. Co-composted biochar improves soil properties and enhances crop productivity. Pristine and engineered biochar can also be employed for water and soil remediation to remove pollutants. In construction, biochar can be added to cement or asphalt, thus conferring structural and functional advantages. Incorporating biochar in biocomposites improves insulation, electromagnetic radiation protection and moisture control. Finally, synthesising biochar-based materials for energy storage applications requires additional functionalisation.

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Coupled anaerobic methane oxidation and reductive arsenic mobilization in wetland soils

Cited by 96 publications

References 69 publications

Methane-Dependent Extracellular Electron Transfer at the Bioanode by the Anaerobic Archaeal Methanotroph “Candidatus Methanoperedens”

Methane-Dependent Extracellular Electron Transfer at the Bioanode by the Anaerobic Archaeal Methanotroph “Candidatus Methanoperedens”

Anaerobic methane oxidation linked to Fe(III) reduction in a Candidatus Methanoperedens‐enriched consortium from the cold Zoige wetland at Tibetan Plateau

Biochar for agronomy, animal farming, anaerobic digestion, composting, water treatment, soil remediation, construction, energy storage, and carbon sequestration: a review

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