A mathematical approach estimating source and sink functioning of competing organs

Plant growth and development depend on both organogenesis and photosynthesis. Organogenesis sets in place various organs (leaves, internodes, fruits, roots) that have their own sinks. The sum of these sinks corresponds to the plant demand. Photosynthesis of the leaves provides the biomass supply (source) that is to be shared among the organs according to their sink strength. Here we present a mathematical model – GreenLab – that describes dynamically plant architecture in a resource-dependent way. The source and sink functions of the various organs control the biomass acquisition and partitioning during plant development and growth, giving the sizes and weights of organs according to their position in the plant architecture. Non-linear least-square method was used to estimate the numerical values of (hidden) parameters that control the organ sink variation and leaf functioning. Through simultaneous fitting of data from several developmental stages (multi-fitting), plant growth could be described satisfactorily with just a few parameters. Examples of application on cotton and maize are shown in this article.

[1]  Zhigang Zhan,et al.  Dual Scale Automaton Model for Virtual Plant Development , 2001 .

[2]  Ep Heuvelink,et al.  Modelling biomass production and yield of horticultural crops: a review , 1998 .

[3]  Harri Hakula,et al.  Components of functional-structural tree models , 2000 .

[4]  W. Press,et al.  Numerical Recipes in Fortran: The Art of Scientific Computing.@@@Numerical Recipes in C: The Art of Scientific Computing. , 1994 .

[5]  Mengzhen Kang,et al.  Building Virtual Chrysanthemum Based on Sink-Source Relationships: Preliminary Results , 2006 .

[6]  P. de Reffye,et al.  Parameter optimization and field validation of the functional-structural model GREENLAB for maize. , 2006, Annals of botany.

[7]  Yves Caraglio,et al.  Essai sur l'identification et la mise en oeuvre des paramètres nécessaires à la simulation d'une architecture végétale. Le logiciel AMAPSIM , 1997 .

[8]  B. Andrieu,et al.  Adel-maize: an l-system based model for the integration of growth processes from the organ to the ca , 1999 .

[9]  Amélie Rostand-Mathieu Essai sur la modélisation des interactions entre la croissance et le développement d'une plante cas du modèle Greenlab , 2006 .

[10]  Philippe de Reffye,et al.  Calibration of a hydraulic architecture-based growth model of cotton plants , 1999 .

[11]  Philippe de Reffye,et al.  Architectural modeling of wheat growth and validation study , 2000 .

[12]  Lin Wu Variational methods applied to plant functionnal-structural dynamics : parameter identification, control and data assimilation , 2005 .

[13]  P. Tomlinson,et al.  Tropical Trees and Forests: An Architectural Analysis , 1978 .

[14]  Prof. Dr. Francis Hallé,et al.  Tropical Trees and Forests , 1978, Springer Berlin Heidelberg.

[15]  P. de Reffye,et al.  A dynamic, architectural plant model simulating resource-dependent growth. , 2004, Annals of botany.