Nutrient-Colimited Trichodesmium as a Nitrogen Source or Sink in a Future Ocean.

ABSTRACT: Nitrogen-fixing (N₂) cyanobacteria provide bioavailable nitrogen to vast ocean regions but are in turn limited by iron (Fe) and/or phosphorus (P), which may force them to employ alternative nitrogen acquisition strategies. The adaptive responses of nitrogen fixers to global-change drivers under nutrient-limited conditions could profoundly alter the current ocean nitrogen and carbon cycles. Here, we show that the globally important N₂ fixer Trichodesmium fundamentally shifts nitrogen metabolism toward organic-nitrogen scavenging following long-term high-CO₂ adaptation under iron and/or phosphorus (co)limitation. Global shifts in transcripts and proteins under high-CO₂/Fe-limited and/or P-limited conditions include decreases in the N_2</

SUBMITTER: Walworth NG 

PROVIDER: S-EPMC5772245 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature