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The stable carbon isotope signature of methane produced by saprotrophic fungi
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The stable carbon isotope signature of methane produced by saprotrophic fungi
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Journal Article
The stable carbon isotope signature of methane produced by saprotrophic fungi
2020
Overview
Methane (CH4) is the most abundant organic compound
in the atmosphere and is emitted from many biotic and abiotic sources.
Recent studies have shown that CH4 production occurs under aerobic
conditions in eukaryotes, such as plants, animals, algae, and saprotrophic
fungi. Saprotrophic fungi play an important role in nutrient recycling in
terrestrial ecosystems via the decomposition of plant litter. Although
CH4 production by saprotrophic fungi has been reported, no data
on the stable carbon isotope values of the emitted CH4
(δ13C-CH4 values) are currently available. In this study, we measured the
δ13C values of CH4 and carbon dioxide (δ13C-CO2 values) emitted by two saprotrophic fungi,
Pleurotus sapidus (oyster mushroom) and Laetiporus sulphureus (sulphur shelf), cultivated on three different
substrates, pine wood (Pinus sylvestris), grass (mixture of Lolium perenne, Poa pratensis, and Festuca rubra), and corn (Zea mays), which reflect
both C3 and C4 plants with distinguished bulk δ13C
values. Applying Keeling plots, we found that the δ13C source
values of CH4 emitted from fungi cover a wide range from −40 to −69 mUr depending on the growth substrate and fungal species. Whilst little
apparent carbon isotopic fractionation (in the range from −0.3 to 4.6 mUr)
was calculated for the δ13C values of CO2 released from
P. sapidus and L. sulphureus relative to the bulk δ13C values of the growth
substrates, much larger carbon isotopic fractionations (ranging from −22
to −42 mUr) were observed for the formation of CH4. Although the two
fungal species showed similar δ13CH4 source values when
grown on pine wood, δ13CH4 source values differed
substantially between the two fungal species when they were grown on grass or corn. We
found that the source values of δ13CH4 emitted by
saprotrophic fungi are highly dependent on the fungal species and the
metabolized substrate. The source values of δ13CH4 cover a
broad range and overlap with values reported for methanogenic archaea, the
thermogenic degradation of organic matter, and other eukaryotes.
