Pathways of N₂O production by marine ammonia-oxidizing archaea determined from dual-isotope labeling.

ABSTRACT: The ocean is a net source of the greenhouse gas and ozone-depleting substance, nitrous oxide (N₂O), to the atmosphere. Most of that N₂O is produced as a trace side product during ammonia oxidation, primarily by ammonia-oxidizing archaea (AOA), which numerically dominate the ammonia-oxidizing community in most marine environments. The pathways to N₂O production and their kinetics, however, are not completely understood. Here, we use ¹⁵N and ¹⁸O isotopes to determine the kinetics of N₂O production and trace the source of nitrogen (N) and oxygen (O) atoms in N₂O produced by a model marine AOA species, Nitrosopumilus maritimus. We find that during ammonia oxidation, the apparent half saturation constants of nit

SUBMITTER: Wan XS 

PROVIDER: S-EPMC10243131 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature