Nitrous oxide production and consumption by marine ammonia-oxidizing archaea under oxygen depletion.

ABSTRACT: Ammonia-oxidizing archaea (AOA) are key players in the nitrogen cycle and among the most abundant microorganisms in the ocean, thriving even in oxygen-depleted ecosystems. AOA produce the greenhouse gas nitrous oxide (N₂O) as a byproduct of ammonia oxidation. Additionally, the recent discovery of a nitric oxide dismutation pathway in the AOA isolate Nitrosopumilus maritimus points toward other N₂O production and consumption pathways in AOA. AOA that perform NO dismutation when exposed to oxygen depletion, produce oxygen and dinitrogen as final products. Based on the transient accumulation of N₂O coupled with oxygen accumulation, N₂O has been proposed as an intermediate in this novel archaeal pathway. In this study, we spiked N₂O

SUBMITTER: Hernandez-Magana E 

PROVIDER: S-EPMC11408285 | biostudies-literature | 2024

REPOSITORIES: biostudies-literature