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Simuler la plasticité phénotypique des Poacées comme propriété émergente de processus locaux : Un modèle structure-fonction couplant la morphogénèse et le métabolisme du carbone et de l’azote

Abstract : Phenotypic plasticity - the ability of one genotype to produce different phenotypes depending on growth conditions - is a core aspect of the interactions between the plants and their environment. Models are useful tools allowing integrating these feedback loops between shoot architecture and growth conditions so simulating their outputs, especially functional-structural plant models (FSPM) as they account for an explicit description of individual plant architecture. To date, the existing crop FSPM that address the coupling between resource availability and growth are hampered by their lack of capacity to simulate shoot morphogenesis as they lack processed-based formalism. This work aims to build a FSPM that includes morphogenesis, which simulates mechanistically the whole plant functioning and trait acquisition as properties arising from the feedback between morphogenesis, environmental factors and source–sink activities within the plant. The model is driven by carbon and nitrogen metabolism in each organ and coordination rules between successive leaves. In parallel with the development of the model, an experiment was performed to collect useful data for the model calibration and evaluation. The model was calibrated for wheat. It simulated realistic patterns of leaf traits and the variation of leaf traits with growth conditions was coherent with the bibliography. Interestingly, the model simulated, as emergent properties, key traits at organ and plant scales that are taken as inputs in most models: pattern of mature leaf dimensions along the culm, phyllochron stability, realistic shoot/roots ratio, etc.
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Submitted on : Friday, February 25, 2022 - 1:01:51 AM
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  • HAL Id : tel-03588545, version 1

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Marion Gauthier. Simuler la plasticité phénotypique des Poacées comme propriété émergente de processus locaux : Un modèle structure-fonction couplant la morphogénèse et le métabolisme du carbone et de l’azote. Biologie végétale. Université Paris-Saclay, 2021. Français. ⟨NNT : 2021UPASB005⟩. ⟨tel-03588545⟩

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