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 influxReportar como inadecuado




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 - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

1 EVA - Ecophysiologie Végétale, Agronomie et Nutritions 2 PIAF - Laboratoire de Physique et Physiologie Intégratives de l-Arbre Fruitier et Forestier

Abstract : 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.

Keywords : 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





Autor: Erwan Le Deunff - Philippe Malagoli -

Fuente: https://hal.archives-ouvertes.fr/



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