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Low-Ammonium Environment Increases the Nutrient Exchange between Diatom–Diazotroph Association Cells and Facilitates Photosynthesis and N 2 Fixation—a Mechanistic Modeling Analysis.
- Source :
-
Cells (2073-4409) . Sep2022, Vol. 11 Issue 18, pN.PAG-N.PAG. 14p. - Publication Year :
- 2022
-
Abstract
- Diatom–diazotroph associations (DDAs) are one of the most important symbiotic dinitrogen (N2) fixing groups in the oligotrophic ocean. Despite their capability to fix N2, ammonium (NH4+) remains a key nitrogen (N) source for DDAs, and the effect of NH4+ on their metabolism remains elusive. Here, we developed a coarse-grained, cellular model of the DDA with NH4+ uptake and quantified how the level of extracellular NH4+ influences metabolism and nutrient exchange within the symbiosis. The model shows that, under a fixed growth rate, an increased NH4+ concentration may lower the required level of N2 fixation and photosynthesis, and decrease carbon (C) and N exchange. A low-NH4+ environment leads to more C and N in nutrient exchange and more fixed N2 to support a higher growth rate. With higher growth rates, nutrient exchange and metabolism increased. Our study shows a strong effect of NH4+ on metabolic processes within DDAs, and thus highlights the importance of in situ measurement of NH4+ concentrations. [ABSTRACT FROM AUTHOR]
- Subjects :
- *NITROGEN fixation
*PHOTOSYNTHESIS
*FIXED interest rates
*NITROGEN
Subjects
Details
- Language :
- English
- ISSN :
- 20734409
- Volume :
- 11
- Issue :
- 18
- Database :
- Academic Search Index
- Journal :
- Cells (2073-4409)
- Publication Type :
- Academic Journal
- Accession number :
- 159338820
- Full Text :
- https://doi.org/10.3390/cells11182911