Role ofBacteria,ArchaeaandFungiinvolved in Methane Release in Abandoned Coal Mines

Beckmann, Sabrina; Krüger, Martin; Engelen, Bert; Gorbushina, Anna A.; Cypionka, Heribert

doi:10.1080/01490451.2010.503258

Cited by 56 publications

(62 citation statements)

References 39 publications

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“…Previous studies suggested that fungi enhance archaea-derived CH 4 formation by initiating the decay of organic matter, thereby providing methanogenic archaea with their substrate 15,19 . However, to our knowledge fungi have never been reported before as direct producers of CH 4 in the course of their own metabolism.…”

Section: Discussionmentioning

confidence: 99%

“…Fungi occupy a key role in degradation processes, representing an important part of the soil biome, and mycorrhizal fungi establish a close symbiosis with plant roots. Fungi have already been identified as members of a methanogenic food chain by providing methanogenic archaea with their substrate 14,15 , but they have to date not been reported to produce CH 4 per se. It is known that diverse bacteria can inhabit fungal mycelia [16][17][18] , but no methanogenic archaea have been found as endosymbionts in fungi.…”

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confidence: 99%

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Evidence for methane production by saprotrophic fungi

et al. 2012

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methane in the biosphere is mainly produced by prokaryotic methanogenic archaea, biomass burning, coal and oil extraction, and to a lesser extent by eukaryotic plants. Here we demonstrate that saprotrophic fungi produce methane without the involvement of methanogenic archaea. Fluorescence in situ hybridization, confocal laser-scanning microscopy and quantitative realtime PCR confirm no contribution from microbial contamination or endosymbionts. our results suggest a common methane formation pathway in fungal cells under aerobic conditions and thus identify fungi as another source of methane in the environment. stable carbon isotope labelling experiments reveal methionine as a precursor of methane in fungi. These findings of an aerobic fungus-derived methane formation pathway open another avenue in methane research and will further assist with current efforts in the identification of the processes involved and their ecological implications.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

Evidence for methane production by saprotrophic fungi

et al. 2012

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“…We are not aware of any earlier reports about stem concentrations of CH4 in Norway spruce or any other tree species infected by Heterobasidion and Armillaria spp., fungi able to infect a wide range of conifer and broadleaved trees. As proposed in earlier studies, under microaerobic or anaerobic conditions, intermediate degradation products from fungal degradation of lignocellulose may provide substrates for bacteria and archaea [9,10], which in turn can accelerate fungal growth by removing their metabolic waste products and by enriching the substrate through N-fixation [11]. The apparent lack of correlation between stem CH4 and O2 concentrations in trees with elevated CH4 levels is noteworthy, and is probably due to the utilized point measurements, which profile the composition of gas diffusion stream that includes also the CH4 produced at anaerobic microsites.…”

Section: Discussionmentioning

confidence: 99%

“…Anaerobic or microaerobic conditions can also occur in the heartwood of trees growing on well-drained upland soils to an extent that the mineralization of heartwood by associated decay fungi is hampered [9,10]. Under such conditions the intermediate degradation products from lignocellulose decomposition may provide substrates for anaerobic bacteria and archaea, which in turn can accelerate fungal growth by removing their metabolic waste products and by supplying nitrogen through N-fixation [11]. In addition, it has also been proposed that wood decay fungi themselves can produce small amounts of CH4 without the involvement of methanogenic archaea [12].…”

Section: Introductionmentioning

confidence: 99%

Carbon Dioxide and Methane Formation in Norway Spruce Stems Infected by White-Rot Fungi

Hietala

Dörsch

Kvaalen

et al. 2015

Forests

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Globally, billions of tons of carbon sequestered in trees are annually recycled back to the atmosphere through wood decomposition by microbes. In Norway, every fifth Norway spruce shows at final harvest infection by pathogenic white-rot fungi in the genera Heterobasidion and Armillaria. As these fungi can mineralize all components of wood, we predicted that they have a significant carbon footprint. Gas samples taken from infected stems were analyzed for CO2 and CH4 concentrations, and wood samples from different parts of the decay columns were incubated under hypoxic (4% O2) and anoxic laboratory conditions. In spring and summer the stem concentrations of CO2 were generally two times higher in trees with heartwood decay than in healthy trees. For most of the healthy trees and trees with heartwood decay, mean stem concentrations of CH4 were comparable to ambient air, and only some Armillaria infected trees showed moderately elevated CH4. Consistently, low CH4 production potentials were recorded in the laboratory experiment. Up-scaling of CO2 efflux due to wood decay in living trees suggests that the balance between carbon sequestration and emission may be substantially influenced in stands with high frequency of advanced root and stem heartwood decay.

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“…Just as CH 4 generation is typically a combined bacterial and fungal effort (Beckmann et al, 2011), it is likely that capture and oxidation of CH 4 is also a community dynamic. Currently, we have a limited knowledge of the interactions between fungi and methanotrophs or their co-localization.…”

Section: Interactions Of Fungi and Methanotrophsmentioning

confidence: 99%