Quilot Bénédicte, Génard Michel
Unité de Génétique et Amélioration des Fruits et Légumes, Institut National de la Recherche Agronomique, BP 94, 84143 Montfavet, France.
J Plant Res. 2008 Jan;121(1):55-63. doi: 10.1007/s10265-007-0125-9. Epub 2007 Dec 8.
The number of cells and the mean cell volume in the mesocarps of fruits from peach genotypes with different percentages of the genome of Prunus davidiana, a wild, related, species, were evaluated. The mesocarp mass varied greatly between the four groups of genotypes. The mean cell volume and the number of cells were negatively correlated within each group. This correlation can be interpreted as a relationship of competition between cells. In order to describe the type of competition in the different groups, we tried to adjust a model of competition for resources proposed by Lescourret and Génard (Ecoscience 10:334-341, 2003). To estimate the values of the three parameters of the model for the different groups, we applied model selection. Within nested models, we identified a single best model with six parameter values. This model was roughly accurate, but it allowed us to describe the general relationship for each group. The parameter values revealed a strong and under-compensating density-dependence effect for all groups. The percentage of P. davidiana genome appeared to influence the maximal number of cells and the strength of the competition, but no effect was found on the maximal mean volume of cells.
对具有不同比例中国李（一种野生近缘种）基因组的桃基因型果实中果皮的细胞数量和平均细胞体积进行了评估。四组基因型之间的中果皮质量差异很大。每组中平均细胞体积和细胞数量呈负相关。这种相关性可以解释为细胞之间的竞争关系。为了描述不同组中的竞争类型，我们尝试拟合Lescourret和Génard（《生态科学》10:334 - 341，2003年）提出的资源竞争模型。为了估计不同组模型的三个参数值，我们应用了模型选择。在嵌套模型中，我们确定了一个具有六个参数值的单一最佳模型。该模型大致准确，但它使我们能够描述每组的一般关系。参数值显示所有组都存在强烈且补偿不足的密度依赖效应。中国李基因组的比例似乎影响细胞的最大数量和竞争强度，但未发现对细胞的最大平均体积有影响。
