Organic metabolite uptake by diazotrophs in the North Pacific Ocean.

ABSTRACT: Dinitrogen (N₂) fixation by diazotrophs supports ocean productivity. Diazotrophs include photoautotrophic cyanobacteria, non-cyanobacterial diazotrophs (NCDs), and the recently discovered N₂-fixing haptophyte. While NCDs are ubiquitous in the ocean, their ecology and metabolism remain largely unknown. Unlike cyanobacterial diazotrophs and the haptophyte, NCDs are primarily heterotrophic and depend on dissolved organic matter (DOM) for carbon and energy. However, conventional DOM amendment incubations do not allow discerning how different diazotrophs use DOM molecules, limiting our knowledge on DOM-diazotroph interactions. To identify diazotrophs using DOM, we amended North Pacific microbial communities with ¹³C-labeled DOM from phytoplankton cultures that was molecula

SUBMITTER: Filella A 

PROVIDER: S-EPMC12064561 | biostudies-literature | 2025 Jan

REPOSITORIES: biostudies-literature