Nitrogen acquisition and utilization by crops: review of different approaches and proposition of a mechanistic modeling

Jessica Bertheloot (1) , Paul-Henry Cournède (2) , Bruno Andrieu (3)

1 IRHS - Institut de Recherche en Horticulture et Semences
2 MAS - Mathématiques Appliquées aux Systèmes - EA 4037
3 EGC - Environnement et Grandes Cultures

To avoid pollution by nitrogen fertilizers, nitrogen acquisition and utilization by plants should be optimized. Models are potentially efficient tools to study a priori new possible scenarios. This work reviews how models formalize nitrogen economy in plants. It appears that the formalization of the processes regulating nitrogen use in plants has remained largely empirical. This hampers models ability to simulate plant behavior in innovative scenarios. The functional-structural model developed by Bertheloot et al. (2008) demonstrates the possibility for a mechanistic modeling, based on the formalization of the turnover of the proteins of the photosynthetic apparatus. However, this model specifically addresses the distribution of nitrogen between laminae and the grains during the reproductive stage of wheat. Based on this approach, we propose here a more complete model, including the simulation of root N uptake, the dynamics of N in all plant components and the extension to the pre-flowering period, when vegetative structure is dynamic.

Mots clés: modelisation en biologie

Domaines: Sciences du Vivant [q-bio]

Jessica Bertheloot, Paul-Henry Cournède, Bruno Andrieu. Nitrogen acquisition and utilization by crops: review of different approaches and proposition of a mechanistic modeling. Third International Symposium on Plant Growth Modeling, Simulation, Visualization and Applications: proceedings, 9-13 November 2009, Beijing, China, IEEE Computer Society, 454 p., 2010, Plant Growth Modeling, Simulation, Visualization and Applications, 978-0-7695-3988-1. ⟨hal-01192311⟩