Nitrous oxide (N2O) synthesis by the freshwater cyanobacterium Microcystis aeruginosa
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Published:2023-02-13
Issue:3
Volume:20
Page:687-693
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ISSN:1726-4189
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Container-title:Biogeosciences
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language:en
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Short-container-title:Biogeosciences
Author:
Fabisik Federico, Guieysse Benoit, Procter Jonathan, Plouviez MaxenceORCID
Abstract
Abstract. Pure cultures of the freshwater cyanobacterium Microcystis aeruginosa
synthesized nitrous oxide (N2O) when supplied with nitrite
(NO2-) in darkness (198.9 nmol g-DW−1 h−1 after 24 h) and illumination (163.1 nmol g-DW−1 h−1 after 24 h), whereas N2O production
was negligible in abiotic controls supplied with NO2- and in cultures deprived of exogenous nitrogen. N2O production was also
positively correlated to the initial NO2- and M. aeruginosa concentrations but was
low to negligible when nitrate (NO3-) and ammonium
(NH4+) were supplied as the sole exogenous N source instead of
NO2-. A protein database search revealed that M. aeruginosa possesses protein
homologous to eukaryotic microalgae enzymes known to catalyze the successive
reduction of NO2- into nitric oxide (NO) and N2O. Our
laboratory study is the first demonstration that M. aeruginosa possesses the ability to
synthesize N2O. As M. aeruginosa is a bloom-forming cyanobacterium found globally,
further research (including field monitoring) is now needed to establish the
significance of N2O synthesis by M. aeruginosa under relevant conditions (especially
in terms of N supply). Further work is also needed to confirm the
biochemical pathway and potential function of this synthesis.
Funder
Ministry for Primary Industries
Publisher
Copernicus GmbH
Subject
Earth-Surface Processes,Ecology, Evolution, Behavior and Systematics
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