An updated model for nitrate uptake modelling in plants. I. Functional component: cross-combination of flow-force interpretation of nitrate uptake isotherms, and environmental and in planta regulation of nitrate influx
Résumé
In spite of major breakthroughs in the last three decades in the identification of root nitrate uptake transporters in plants and the associated regulation of nitrate transport activities, a simplified and operational modelling approach for nitrate uptake is still lacking. This is due mainly to the difficulty in linking the various regulations of nitrate transport that act at different levels of time and on different spatial scales. A cross-combination of a Flow-Force approach applied to nitrate influx isotherms and experimentally determined environmental and in planta regulation is used to model nitrate in oilseed rape, Brassica napus. In contrast to 'Enzyme-Substrate' interpretations, a Flow-Force modelling approach considers the root as a single catalytic structure and does not infer hypothetical cellular processes among nitrate transporter activities across cellular layers in the mature roots. In addition, this approach accounts for the driving force on ion transport based on the gradient of electrochemical potential, which is more appropriate from a thermodynamic viewpoint. Use of a Flow-Force formalism on nitrate influx isotherms leads to the development of a new conceptual mechanistic basis to model more accurately N uptake by a winter oilseed rape crop under field conditions during the whole growth cycle. This forms the functional component of a proposed new structure-function mechanistic model of N uptake.
Mots clés
Nitrate uptake isotherms
nitrate influx regulation
N uptake modelling
Flow-Force interpretation
nitrogen uptake efficiency
functional-structural plant model
root development
root longevity
sustainable agriculture
Brassica napus
oilseed rape
brassica-napus l
to-cell communication
root apical meristem
winter
water-uptake
electrokinetic interpretation
arabidopsis-thaliana
biological systems
festuca-pratensis
diurnal-variation
Domaines
Biologie végétale
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2014_LeDeunff_Ann_Bot_{634D948A-46C6-4D62-B5D6-DE345345D92E}.pdf (1.01 Mo)
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