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Nitrogen distribution within wheat plants (Triticum aestivum L.) after flowering: a dynamic model based on a functional-structural approach

Abstract : Nitrogen is an important resource for plant growth and crop pathogens. The objective of this study is to propose a process-based modelling of N dynamics within a wheat plant after anthesis. To achieve that, a functional-structural approach was used. Experiments were performed to quantify the spatio-temporal nitrogen dynamics within a wheat culm after anthesis. Nitrogen mass per unit surface area of laminae and sheaths decreased with canopy depth, but was homogeneously distributed across lamina and sheath surfaces. In addition, nitrogen dynamics were synchronous for each phytomer and similar except for a scale factor. In the period of no root nitrogen uptake, those dynamics followed first order kinetics. Based on these results, a functional-structural model of nitrogen dynamics within the culm botanical structure has been developed. Model main assumptions are: (i) the lamina nitrogen content is determined by the turnover of the proteins of the photosynthetic apparatus; (ii) the different entities of the culm share a common pool of mobile nitrogen. The model has been validated for a contrasted range of experimental conditions with a unique set of six parameters. The nitrogen - light relationships are an emerging property of processes described at a local scale. This work paves the way for simulating the regulation of nitrogen dynamics in individual-based models of plant population.
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Submitted on : Friday, July 24, 2009 - 8:00:00 AM
Last modification on : Friday, July 24, 2009 - 8:00:00 AM
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Jessica Bertheloot. Nitrogen distribution within wheat plants (Triticum aestivum L.) after flowering: a dynamic model based on a functional-structural approach. Mathematics [math]. AgroParisTech, 2009. English. ⟨NNT : 2009AGPT0007⟩. ⟨pastel-00005134⟩

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