Low yield and abiotic origin of N2O formed by the complete nitrifier Nitrospira inopinata

K. Dimitri Kits, Man-Young Jung, Julia Vierheilig, Petra Pjevac, Christopher J. Sedlacek, Shurong Liu, Craig Herbold, Lisa Y. Stein, Andreas Richter, Holger Wissel, Nicolas Brüggemann, Michael Wagner () and Holger Daims
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K. Dimitri Kits: University of Vienna
Man-Young Jung: University of Vienna
Julia Vierheilig: University of Vienna
Petra Pjevac: University of Vienna
Christopher J. Sedlacek: University of Vienna
Shurong Liu: University of Vienna
Craig Herbold: University of Vienna
Lisa Y. Stein: University of Alberta
Andreas Richter: University of Vienna
Holger Wissel: Forschungszentrum Jülich GmbH
Nicolas Brüggemann: Forschungszentrum Jülich GmbH
Michael Wagner: University of Vienna
Holger Daims: University of Vienna

Nature Communications, 2019, vol. 10, issue 1, 1-12

Abstract: Abstract Nitrous oxide (N2O) and nitric oxide (NO) are atmospheric trace gases that contribute to climate change and affect stratospheric and ground-level ozone concentrations. Ammonia oxidizing bacteria (AOB) and archaea (AOA) are key players in the nitrogen cycle and major producers of N2O and NO globally. However, nothing is known about N2O and NO production by the recently discovered and widely distributed complete ammonia oxidizers (comammox). Here, we show that the comammox bacterium Nitrospira inopinata is sensitive to inhibition by an NO scavenger, cannot denitrify to N2O, and emits N2O at levels that are comparable to AOA but much lower than AOB. Furthermore, we demonstrate that N2O formed by N. inopinata formed under varying oxygen regimes originates from abiotic conversion of hydroxylamine. Our findings indicate that comammox microbes may produce less N2O during nitrification than AOB.

Date: 2019
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DOI: 10.1038/s41467-019-09790-x

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