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Plant Growth Modeling, Simulation, Visualization and Applications - PMA09, Beijing : Chine (2009)

Comparison between empirical or functional sinks of organs - Application on Tomato plant

Baogui Zhang (  Auteur correspondant ) 1, Meng Zhen Kang 2, Véronique Letort 3, 4, Xiujuan Wang 1, 3, P. De Reffye 4, 5

(2010)

Biomass partitioning among organs depends on their sink strengths, i.e. their capacity to attract assimilates. Using a descriptive approach, where plant development is driven by thermal time, and empirical laws fitted from experimental data, it is possible to trace back by inverse method the dynamics of biomass partitioning among organs. However, the descriptive sink function suffers from the drawbacks that organ development and biomass accumulation are not interactively related. Moreover, many parameters are required and are difficult to be measured accurately. In this paper an alternative organ sink strength definition is proposed, in which the organ sink size is related to the maximum organ biomass, which in turn depends on its primordium size. The sink strength increases proportionally to its size at the early growth stage and decreases by dampening when its mass approaches the final mass. Comparisons to the standard empirical sink function used in the GreenLab model were conducted on tomato plants. The new functional sinks are more biologically relevant and simulated rather adequately the organ biomass evolution. Further improvement is ongoing to increase simulation accuracy.

1 :	Key Laboratory of Plant-Soil Interactions (PSI)
	China Agricultural University
2 :	Eco-informatics (LIAMA)
	Centre de coopération internationale en recherche agronomique pour le développement [CIRAD] – CNRS – Institut national de la recherche agronomique (INRA) – INRIA – Chinese Academy of Science (CAS) – Institute of Automation, Chinese Academy of Sciences
3 :	Mathématiques Appliquées aux Systèmes - EA 4037 (MAS)
	Ecole Centrale Paris
4 :	DIGIPLANTE (INRIA Saclay - Ile de France)
	INRIA – Centre de coopération internationale en recherche agronomique pour le développement [CIRAD] : UMR – Ecole Centrale Paris
5 :	BotAnique et BioinforMatique de l'Architecture des Plantes (AMAP)
	Centre de coopération internationale en recherche agronomique pour le développement [CIRAD] : UMR51 – CNRS : UMR5120 – Institut de recherche pour le développement [IRD] – Institut national de la recherche agronomique (INRA) : UR0931 – Université Montpellier II - Sciences et techniques

Domaine

:

Sciences du Vivant/Biologie végétale Mathématiques/Systèmes dynamiques

Mots Clés : functional-structural model – plant growth – source-sink – empirical sinks – demand

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Contributeur : Veronique Letort <>

Soumis le : Mercredi 15 Décembre 2010, 15:35:10

Dernière modification le : Mercredi 15 Décembre 2010, 15:58:39