Modelling the influence of assimilate availability on root growth and architecture

Thaler Philippe, Pagès Loïc. 1998. Modelling the influence of assimilate availability on root growth and architecture. Plant and Soil, 201 (2) : 307-320.

https://doi.org/10.1023/A:1004380021699

Article de revue ; Article de revue à facteur d'impact

Version publiée - Anglais
Accès réservé aux personnels Cirad
Utilisation soumise à autorisation de l'auteur ou du Cirad.
390421.pdf
Télécharger (306kB) | Demander une copie

Autre titre : Modélisation de l'influence de la disponibilité en assimilats sur l'architecture et la croissance des racines

Résumé : A model has been designed to simulate rubber seedling root development as related to assimilate availability. Each root of the system is defined both as an element of a network of axes, characterized by its order, position and connections and as an individual sink competing for assimilates. At each time step, the growth of each root is calculated as a function of its own growth potential and of assimilate availability calculated within the whole plant. The potential elongation rate of a root is estimated by its apical diameter, which reflects the size of the meristem. When a root is initiated, the apical diameter depends on root type, but it varies thereafter according to assimilate availability. Thus, the latter controls both current and potential elongation. The model was able to simulate periodicity in root development as related to shoot growth and to reproduce differences in sensitivity to assimilate availability related to root type. It thereby validated the hypothesis that root growth but also root system architecture depend on assimilate allocation and that apical diameter is a good indicator of root growth potential. Provided that specific calibration is done, this model may be used for other species.

Mots-clés Agrovoc : Hevea brasiliensis, système racinaire, racine, modèle de simulation, croissance, photosynthèse, disponibilité d'élément nutritif, morphogénèse, périodicité, diamètre, ramification