Rhizobia-diatom symbiosis fixes missing nitrogen in the ocean.

ABSTRACT: Nitrogen (N₂) fixation in oligotrophic surface waters is the main source of new nitrogen to the ocean¹ and has a key role in fuelling the biological carbon pump². Oceanic N₂ fixation has been attributed almost exclusively to cyanobacteria, even though genes encoding nitrogenase, the enzyme that fixes N₂ into ammonia, are widespread among marine bacteria and archaea^3-5. Little is known about these non-cyanobacterial N₂ fixers, and direct proof that they can fix nitrogen in the ocean has so far been lacking. Here we report the discovery of a non-cyanobacterial N₂-fixing symbiont, 'Candidatus Tectiglobus diatomicola', which provides its diatom host with fixed nitrogen in return for photosynthetic carbon. T

SUBMITTER: Tschitschko B 

PROVIDER: S-EPMC11208148 | biostudies-literature | 2024 Jun

REPOSITORIES: biostudies-literature