Marcelis L F
DLO-Research Institute for Agrobiology and Soil Fertility (AB-DLO), P.O. Box 14, 6700 A A Wageningen, The Netherlands.
Ann Bot. 1994 Jul;74(1):43-52. doi: 10.1093/aob/74.1.43.
A dynamic model is developed for the simulation of the daily dry matter distribution between the generative and vegetative plant parts and the distribution among individual fruits in greenhouse cucumber. The model is based on the hypothesis that dry matter partitioning is regulated by the sink strengths of the plant organs. The sink strength of an organ is denned here as its potential growth rate, i.e. the growth rate at non-limiting assimilate supply. The sink strength of each individual fruit is described as a function of its temperature sum after anthesis and the actual temperature, that of the vegetative plant parts as a function of actual temperature only. The formation rate of nonaborting fruits is essentially a function of the source/sink ratio. Model results agreed well with the measured fluctuating distribution of dry matter between fruits and vegetative parts. The measured effects of three intensities of fruit removal were also simulated satisfactorily. When simulating the partitioning among individual fruits the final fruit size was simulated quite well. However, the growth rate of young fruits was usually overestimated and that of old fruits underestimated, because of dominance among fruits. This phenomenon could be accounted for by incorporating priority functions into the model. Finally, a sensitivity analysis of the model was performed to investigate the effects of some climatic factors, manipulations of the number of fruits on a plant and model parameters on dry matter distribution. Strategies to manipulate the dry matter distribution are discussed.
建立了一个动态模型，用于模拟温室黄瓜生殖器官和营养器官之间每日干物质的分配以及单个果实之间的分配。该模型基于这样的假设，即干物质分配受植物器官库强的调节。这里将器官的库强定义为其潜在生长速率，即在同化供应不受限制时的生长速率。每个单个果实的库强被描述为其开花后积温与实际温度的函数，营养器官的库强仅被描述为实际温度的函数。不脱落果实的形成速率本质上是源/库比的函数。模型结果与果实和营养器官之间干物质波动分布的测量结果吻合良好。三种疏果强度的测量效应也得到了满意的模拟。在模拟单个果实之间的分配时，最终果实大小模拟得相当好。然而，由于果实之间的优势关系，幼果的生长速率通常被高估，而老果的生长速率被低估。这种现象可以通过在模型中纳入优先级函数来解释。最后，对该模型进行了敏感性分析，以研究一些气候因素、植株上果实数量的调控以及模型参数对干物质分配的影响。讨论了调控干物质分配的策略。
