Xs. Hu et Ra. Ennos, Impacts of seed and pollen flow on population genetic structure for plant genomes with three contrasting modes of inheritance, GENETICS, 152(1), 1999, pp. 441-450
The classical island and one-dimensional stepping-stone models of populatio
n genetic structure developed for animal populations are extended to hermap
hrodite plant populations to study the behavior of biparentally inherited n
uclear genes and organelle genes with paternal and maternal inheritance. By
substituting appropriate values for effective population sizes and migrati
on rates of the genes concerned into the classical models, expressions for
genetic differentiation and correlation in gene frequency between populatio
ns can be derived. For both models, differentiation for maternally inherite
d genes at migration-drift equilibrium is greater than that for paternally
inherited genes, which in turn is greater than that for biparentally inheri
ted nuclear genes. In the stepping-stone model, the change of genetic corre
lation with distance is influenced by the mode of inheritance of the gene a
nd the relative values of long and short-distance migration by seed and pol
len. In situations where it is possible to measure simultaneously F-st for
genes with all three types of inheritance, estimates of the relative rates
of pollen to seed flow can be made for both the short- and long-distance co
mponents of migration in the stepping-stone model.