Document Type
Article
Department/Program
Virginia Institute of Marine Science
Publication Date
2016
Journal
Fems Microbiology Letters
Volume
363
Issue
4
Abstract
Fungi may play an important role in the production of the greenhouse gas nitrous oxide (N2O). Bipolaris sorokiniana is a ubiquitous saprobe found in soils worldwide, yet denitrification by this fungal strain has not previously been reported. We aimed to test if B. sorokiniana would produce N2O and CO2 in the presence of organic and inorganic forms of nitrogen (N) under microaerobic and anaerobic conditions. Nitrogen source (organic-N, inorganic-N, no-N control) significantly affected N2O and CO2 production both in the presence and absence of oxygen, which contrasts with bacterial denitrification. Inorganic N addition increased denitrification of N2O (from 0 to 0.3 mu g N(2)0-N h(-1) g(-1) biomass) and reduced respiration of CO2 (from 0.1 to 0.02 mg CO2 h(-1) g(-1) biomass). Isotope analyses indicated that nitrite, rather than ammonium or glutamine, was transformed to N2O. Results suggest the source of N may play a larger role in fungal N2O production than oxygen status.
DOI
10.1093/femsle/fnw007
Keywords
Dissimilatory Nitrate Reduction; Nitric-Oxide; Cytochrome P450Nor; N2O Production; Soil; Codenitrification; Bacteria; Emission; Hypoxia; No
Recommended Citation
Phillips, R; Grelet, G; McMillan, A; Song, BK; Weir, B; and Et al., Fungal denitrification: Bipolaris sorokiniana exclusively denitrifies inorganic nitrogen in the presence and absence of oxygen (2016). Fems Microbiology Letters, 363(4).
10.1093/femsle/fnw007
