Christophe Angélique, Letort Véronique, Hummel Irène, Cournède Paul-Henry, de Reffye Philippe, Lecœur Jérémie
INRA, UMR759 LEPSE, 2 place Viala, F-34060 Montpellier, France.
Ecole Centrale Paris, Applied Mathematics Laboratory, 2 Grande Voie des Vignes, F-92295 Châtenay-Malabry, France.
Funct Plant Biol. 2008 Dec;35(11):1147-1162. doi: 10.1071/FP08099.
Arabidopsis thaliana (L.) Heynh. is used as a model plant in many research projects. However, few models simulate its growth at the whole-plant scale. The present study describes the first model of Arabidopsis growth integrating organogenesis, morphogenesis and carbon-partitioning processes for aerial and subterranean parts of the plant throughout its development. The objective was to analyse competition among sinks as they emerge from patterns of plant structural development. The model was adapted from the GreenLab model and was used to estimate organ sink strengths by optimisation against biomass measurements. Dry biomass production was calculated by a radiation use efficiency-based approach. Organogenesis processes were parameterised based on experimental data. The potential of this model for growth analysis was assessed using the Columbia ecotype, which was grown in standard environmental conditions. Three phases were observed in the overall time course of trophic competition within the plant. In the vegetative phase, no competition was observed. In the reproductive phase, competition increased with a strong increase when lateral inflorescences developed. Roots and internodes and structures bearing siliques were strong sinks and had a similar impact on competition. The application of the GreenLab model to the growth analysis of A. thaliana provides new insights into source-sink relationships as functions of phenology and morphogenesis.
拟南芥（Arabidopsis thaliana (L.) Heynh.）在许多研究项目中被用作模式植物。然而，很少有模型能在全株尺度上模拟其生长。本研究描述了首个拟南芥生长模型，该模型整合了植物地上和地下部分在整个发育过程中的器官发生、形态发生和碳分配过程。目的是分析随着植物结构发育模式出现的库之间的竞争。该模型是在GreenLab模型的基础上改编的，通过针对生物量测量进行优化来估计器官库强度。干生物量产量通过基于辐射利用效率的方法计算。器官发生过程根据实验数据进行参数化。使用在标准环境条件下生长的哥伦比亚生态型评估了该模型进行生长分析的潜力。在植物营养竞争的整个时间进程中观察到三个阶段。在营养阶段，未观察到竞争。在生殖阶段，随着侧生花序的发育，竞争加剧且急剧增加。根、节间和着生角果的结构是强大的库，对竞争有类似的影响。将GreenLab模型应用于拟南芥的生长分析，为作为物候和形态发生函数的源 - 库关系提供了新的见解。
