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Chapitre D'ouvrage Année : 2009

Modelling Nitrogen Distribution in Virtual Plants, as Exemplified by Wheat Culm During Grain Filling

Résumé

Nitrogen is fundamental for plant growth. In cereals, growing grains represent a strong sink that triggers nitrogen remobilisation from vegetative organs and results in plant death. A better understanding of this mechanism would help in optimizing crop productivity while reducing fertilization. This work presents an experimental analysis and a process-based model of the spatiotemporal nitrogen distribution during grain filling in winter wheat culms. Nitrogen was distributed homogeneously within individual laminae and sheaths, but a strong gradient existed between organs at successive positions along the culm. During grain filling, the changes in nitrogen content of individual laminae and sheaths showed identical patterns, differing only by a scale factor. Modelling N content of each lamina as the result of the turnover of photosynthetic nitrogen and supposing that all organs share a single pool of mobile nitrogen allowed predicting the observed patterns with high accuracy. This offers new insight for modelling plant nitrogen economy
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Dates et versions

hal-01189547 , version 1 (01-09-2015)

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Jessica Bertheloot, Bruno Andrieu, Christian Fournier, Pierre Martres. Modelling Nitrogen Distribution in Virtual Plants, as Exemplified by Wheat Culm During Grain Filling. Third International Symposium on Plant Growth Modeling, Simulation, Visualization and Applications: proceedings, 9-13 November 2009, Beijing, China, IEEE Computer Society, 2009, 978-0-7695-3988-1. ⟨10.1109/PMA.2009.67⟩. ⟨hal-01189547⟩
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