Modelling light-dark regime influence on the carbon-nitrogen metabolism in a unicellular diazotrophic cyanobacterium - Archive ouverte HAL Access content directly
Conference Papers Year : 2013

Modelling light-dark regime influence on the carbon-nitrogen metabolism in a unicellular diazotrophic cyanobacterium

(1, 2) , (1, 2) , (1) , (1) , (2)
1
2

Abstract

We propose a dynamical model depicting nitrogen (N2 ) fixation (diazotrophy) in a unicellular cyanobacterium, Crocosphaera watsonii, grown under light limitation and obligate diazotrophy. In this model, intracellular carbon and nitrogen are both divided into a functional pool and a storage pool. An internal pool that explicitly describes the nitrogenase enzyme is also added. The model is successfully validated with continuous culture experiments of C. watsonii under three light regimes, indicating that proposed mechanisms accurately reproduce the growth dynamics of this organism under various light environments. Then, a series of model simulations is run for a range of light regimes with different photoperiods and daily light doses. Results reveal how nitrogen and carbon are coupled, through the diel cycle, with nitrogenase dynamics, whose activity is constrained by the light regime. We finally identify optimal productivity conditions.
Fichier principal
Vignette du fichier
2013_GRIMAUD_CAB_AOUT2013v3.pdf (603.65 Ko) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-00854479 , version 1 (27-08-2013)

Identifiers

Cite

Ghjuvan Micaelu Grimaud, Anthony Dron, Sophie Rabouille, Antoine Sciandra, Olivier Bernard. Modelling light-dark regime influence on the carbon-nitrogen metabolism in a unicellular diazotrophic cyanobacterium. CAB, Dec 2013, Mumbai, India. ⟨10.3182/20131216-3-IN-2044.00025⟩. ⟨hal-00854479⟩
687 View
254 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More