Nitrous oxide production by the ectomycorrhizal fungi Paxillus involutus and Tylospora fibrillosa

Nitrous oxide (N₂O) production by filamentous fungi has been demonstrated in pure culture and has been estimated indirectly in soils. However, it is unknown whether ectomycorrhizal fungi can also produce N₂O. We demonstrate for the first time the ability of nitrogen (N)-tolerant ectomycorrhizal fung...

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Bibliographic Details
Published in:FEMS microbiology letters 2011-03, Vol.316 (1), p.31-35
Main Authors: Prendergast-Miller, Miranda T, Baggs, Elizabeth M, Johnson, David
Format: Article
Language:English
Subjects:
Agronomy. Soil science and plant productions
Basidiomycota - isolation & purification
Basidiomycota - metabolism
Biological and medical sciences
Culture
Economic plant physiology
ectomycorrhiza
Ectomycorrhizas
Forest soils
Forests
Fundamental and applied biological sciences. Psychology
Fungi
Fusarium
Microbiology
Miscellaneous
Mycology
Mycorrhizae - isolation & purification
Mycorrhizae - metabolism
Nitrate reduction
Nitrates
Nitrates - metabolism
Nitrogen
Nitrous oxide
Nitrous Oxide - metabolism
Oxidation-Reduction
Paxillus involutus
Pure culture
Soil Microbiology
Soil strength
Soils
Symbiosis (nodules, symbiotic nitrogen fixation, mycorrhiza...)
Tylospora fibrillosa
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Summary:Nitrous oxide (N₂O) production by filamentous fungi has been demonstrated in pure culture and has been estimated indirectly in soils. However, it is unknown whether ectomycorrhizal fungi can also produce N₂O. We demonstrate for the first time the ability of nitrogen (N)-tolerant ectomycorrhizal fungi (Paxillus involutus and Tylospora fibrillosa), found in forest soils under moderate to high rates of N deposition, to produce N₂O from nitrate reduction. The N₂O concentrations from the ectomycorrhizal fungal treatments after a 10-day pure culture experiment were 0.0117±0.00015 (P. involutus) and 0.0114±0.0003 (T. fibrillosa), and 0.0114±0.00043 μmol N₂O L⁻¹ from a known fungal denitrifier (Fusarium lichenicola). No N₂O was detected in the control treatment. Our results indicate the potential for these two N-tolerant ectomycorrhizal fungi to contribute to N₂O production. Given that these species are abundant in many forest soils, the strength and regulation of fungal N₂O production should now be verified in situ.
ISSN:0378-1097
1574-6968
DOI:10.1111/j.1574-6968.2010.02187.x