TAILIEUCHUNG - Báo cáo toán học: "How to include organ interactions in models of the root system architecture? The concept of endogenous environment "

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: How to include organ interactions in models of the root system architecture? The concept of endogenous environment Loïc Pagès. | 535 Ann. For. Sci. 57 2000 535-541 INRA EDP Sciences Original article How to include organ interactions in models of the root system architecture The concept of endogenous environment Loic Pages INRA Centre d Avignon Site Agroparc Domaine St-Paul 84914 Avignon Cedex 9 France Received 1 February 1999 accepted 8 July 1999 Abstract - A first generation of models describing the development of the root system architecture did not include explicitly the allocation of resources. These models aimed to mimic the morphogenetic programme by translating the developmental events into a set of formal production rules. The major strength of these models was their ability to simulate simply the relevant topological characteristics of the root systems. However the root system development is known to be highly sensitive to carbon limitations. These effects appear first at the root system level whose global size can be greatly affected by the amount of carbohydrates which are available for the root system development depending on the carbon budget within the whole plant . Moreover competition for carbohydrates within the root system accounts for multiple architectural variations which appear in the heterogeneous soil environment. For example compensatory growth is a common behaviour within root systems. These phenomena can be described by merging source-sink models to morphogenetic rule models . The morphogenetic rule model simulates the topology of the system between root connections whereas the source-sink model simulates the size growth rate of the different organs and allows the definition of an endogenous environment. But in these source -sink models the definition of the sink strength is a crucial point which has received only very little attention for the roots. As an alternative to pre-defined potential growth functions we suggest to use an instantaneous sink strength of each meristem related to its size. After having justified this approach by experimental data we show how .

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