Pollen-mediated gene flow and matting pattern in wild cherry (Prunus avium L.) as affected by the gametophytic self-incompatibility system

Hamburg

2005

S. 82-98

6 Abb., 5 Tab

Artikel aus einer ZeitschriftUnselbständiges Werk

200128314

Mating in populations of self-incompatible plants is determined by the number of distributing of S-alleles, the spatial distribution of the S-genotypes, and the pattern of pollen dispersal. Mating pattern and successful pollen-mediated gene flow in the self-incompatible wild cherry were inferred by means of microsatellites and paternity exclusion. The characterization of the S-genotypes of the complete parent population with about 170 individuals allowed the analysis of gene flow and mating with respect to the tree's S-genotypes. The mean pollination distance varied significantly among the individual seed parents (17 m - 189 m) and depended mainly on the density and the pollen compatibility of the neighboring cherry trees. The genetic composition of the effective pollen pools was found the depend more on the S-genotype than on the spatial location of the seed mother. The gene differentiation of the effective pollen pools varied between the applied microsatellites: two microsatellites that are linked with the S-locus showed low, non-significant differentiation (δ: 12.2 % and 14.4 %), while six microsatellites that are not linked with the S-locus showed higher and statistically significant differentiation (δ between 16.2 % and 33.8 %). Analyzing the mating patterns for the contemporary dynamics of balancing selection revealed significant differences between the S-allele frequency distribution of the assigned pollen donor trees and the potential parent population, and indicated mate selection towards an equal frequency of S-alleles.