Integrating simulation of architectural development and source-sink behaviour of peach trees by incorporating Markov chains and physiological organ function submodels into L-PEACH

Gerardo Lopez1,2, Romeo R. Favreau1, Colin Smith1, Evelyne Costes3, Przemyslaw Prusinkiewicz4, and Theodore M. DeJong1
1 Department of Plant Sciences, University of California, Davis
2 Irrigation Technology, Institute de Recerca i Tecnologia AgroalimentÓries, Lleida, Spain
3 INRA, Monpellier, France
4 Department of Computer Science, University of Calgary

Abstract

L-PEACH is an L-system-based functional-structural model for simulating architectural growth and carbohydrate partitioning among individual organs in peach (Prunus persica (L.) Batsch) trees. The original model provided a prototype for how tree architecture and carbon economy could be integrated, but did not simulate peach tree architecture realistically. Moreover, evaluation of the functional characteristics of the individual organs and the whole tree remained a largely open issue. In the present study, we incorporated Markovian models into L-PEACH to improve the architecture of the simulated trees. The model was also calibrated to grams of carbohydrate, and tools for systematically displaying quantitative outputs and evaluating the behaviour of the model were developed. The use of the Markovian model concept to model tree architecture in L-PEACH reproduced tree behaviour and responses to management practices visually similar to trees in commercial orchards. The new architectural model along with several improvements in the carbohydrate-partitioning algorithms derived from the model evaluation significantly improved the results related to carbon allocation, such as organ growth, carbohydrate assimilation, reserve dynamics and maintenance respiration. The model results are now consistent within the modelled tree structure and are in general agreement with observations of peach trees growing under field conditions.

Reference

Gerardo Lopez, Romeo R. Favreau, Colin Smith, Evelyne Costes, Przemyslaw Prusinkiewicz, and Theodore M. DeJong. Integrating simulation of architectural development and source-sink behaviour of peach trees by incorporating Markov chains and physiological organ function submodels into L-PEACH. Functional Plant Biology 35(10), pp. 761-771, 2008.

Download PDF here (1.3 Mb), or download from the publisher's site.