Quantifying Oxygen Management and Temperature and Light Dependencies of Nitrogen Fixation by Crocosphaera watsonii

• DOI: 10.1128/msphere.00531-19
• Publication Date: 2019-12-10T13:40:37Z
• Authors: Keisuke Inomura; Curtis Deutsch; Samuel T. Wilson; Takako Masuda; Evelyn Lawrenz; Lenka Bučinská; Roman Sobotka; Julia M. Gauglitz; Mak A. Saito; Ondřej Prášil; Michael J. Follows
• Keywords: Light; Nitrogen; Iron; 551; Cyanobacteria; Microbiology; Thylakoids; 03 medical and health sciences; iron; Nitrogen fixation; Microscopy, Electron, Transmission; Cell flux model; Nitrogen Fixation; Crocosphaera; cell flux model; 14. Life underwater; Photosynthesis; 0303 health sciences; Daily cycle; carbon; Temperature; Starch; Carbon; QR1-502; Oxygen; 13. Climate action; light; daily cycle; Research Article

Crocosphaera is one of the major N 2 -fixing microorganisms in open ocean. On a global scale, process fixation important balancing budget, but factors governing rate remain poorly resolved. Here, we combine mechanistic model and both previous present laboratory studies to quantify how chemical such as C, N, Fe, O physical temperature light affect fixation. Our study shows that combines multiple mechanisms reduce intracellular protect -sensitive enzyme. model, however, indicates these protections are insufficient at low due reduced respiration becomes severely limited. This provides physiological explanation for why geographic distribution confined warm low-latitude