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Dernière mise à jour : Mai 2018

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UMR ECOSYS - Ecologie fonctionnelle et écotoxicologie des agroécosystèmes

Exposé : CN-Wheat_RBARILLOT


CN-Wheat: a Functional-Structural Plant Model of CN Metabolism in Wheat


The model proposed here, called CN Wheat, is based on a fully mechanistic approach for the integration of Carbon (C) and Nitrogen (N) metabolisms within wheat plants. CN Wheat is defined at culm scale; the crop is represented as a population of individual culms that compete for light and soil N. Culm structure is composed of a root compartment, a set of photosynthetic organs and the grains. Each module includes structural, storage and mobile materials. Fluxes of C-N among modules take place through a common pool and/or through the transpiration flow. The modelled physiological activities are the acquisition of C and N, the synthesis and degradation of primary metabolites, C respiration, C-N exudation and tissue growth and death. A central role is given to metabolite concentrations as drivers of physiological activities. Thus, the integration within the plant results from that all processes act in parallel on interconnected metabolite pools, which is represented as a set of differential equations. Model behavior was evaluated against a field experimentation with three N fertilizations applied at anthesis. For each N treatment, CN-Wheat accurately predicted the post-anthesis kinetics of (i) C-N distribution among organs, (ii) green areas of laminae and (iii) dry mass and N content of grains. Whereas the use of response functions to metabolite concentration is accepted for each of the processes described in the model, here we show that it can be used for an integrative modelling of the whole plant.

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