A simulation peach growth model at the shoot bearing fruit level: fruit growth variability and reserve kinetics

摘要

A simulation model of carbon supply and demand for vegetative and reproductive growth of peach was developed for shoots bearing fruit. The model considers three compartments: the one-year-old stem, the leafy shoots and the fruits. The model simulates daily and seasonal photosynthetic carbon assimilation using canopy light interception and demand effect on potential photosynthesis. Carbon partitioning and organ growth are simulated using organspecific potential growth of each organ type, and allocation rules. The model takes into consideration the reserve kinetics with phases of mobilisation and accumulation depending on the supply-demand differences. The model reproduced a great part of the fruit growth variability observed on different experiments conducted on early and late maturing peach cultivars. Results from simulations undertaken with different leaf-to-fruit ratios are discussed highlighting on photosynthesis regulation, reserve kinetics effects and dry weight partitioning.