Interrelationships between the pathways of inorganic nitrogen assimilation in the cyanobacterium Gloeothece can be described using a mechanistic mathematical model
• A mathematical model is described that simulates the major features of the interactions between different nitrogen (N)-sources in the nonheterocystous diazotrophic cyanobacterium Gloeothece. • The interaction between ammonium and nitrate is related to the intracellular concentration of glutamine...
| Veröffentlicht in: | The New phytologist. - 1979. - 160(2003), 3 vom: 20. Dez., Seite 545-555 |
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| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2003
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| Zugriff auf das übergeordnete Werk: | The New phytologist |
| Schlagworte: | Journal Article Assimilation Gloeothece N2 fixation ammonium cyanobacteria model nitrate |
| Zusammenfassung: | • A mathematical model is described that simulates the major features of the interactions between different nitrogen (N)-sources in the nonheterocystous diazotrophic cyanobacterium Gloeothece. • The interaction between ammonium and nitrate is related to the intracellular concentration of glutamine (GLN), which in turn is representative of cellular N-status. Development of nitrogenase activity is related to N-limitation but, once developed, continues for as long as there is sufficient glucan (carbon-reserve) in order to support N2 fixation and the assimilation of the resultant ammonium into amino acids. • Nitrogenase activity decreases in response to elevated N-status and also to increased net oxygen evolution, in keeping with biochemical reality. The model describes the diel cycle of C and N2 fixation as seen under alternating 12 h light and 12 h darkness, and also the N2 fixation cycle of about 40 h duration seen in cells cultured in continuous illumination. • This model has the potential to be adapted to describe N2 fixation in heterocystous cyanobacterium and in Trichodesmium |
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| Beschreibung: | Date Revised 20.04.2021 published: Print Citation Status PubMed-not-MEDLINE |
| ISSN: | 1469-8137 |
| DOI: | 10.1046/j.1469-8137.2003.00901.x |