[Impacts of stochastic migration of seed and pollen on differentiation of plant population genetic structure].
The island model was extended to plant population with incorporation of the effects of stochastic migration of seed and pollen grain. Exact mean and variance of gene frequencies were formulated for each of three genomes with different modes of inheritance (bi-parental, paternal and maternal). Theoretical results indicate that stochastic migration in both seed and pollen may increase the variance of gene frequencies among populations, depending upon how large the variations of migration rate and/or migrant gene frequency are. Fluctuation in migration rate or in migrant gene frequencies of seed and pollen grain is also an important factor influencing population genetic structure, perhaps as important as the absolute value of migration rate. One important result is that the combined effect induced by the fluctuation of both migration rate and migrant gene frequency of seed and pollen can greatly intensify differentiation of population genetic structure. Application of these theoretical results in practical work was discussed in detail.
Hu
X S
XS
Chinese Academy of Forestry, Beijing 100091, China.
D003710:Demography; D002523:Edible Grain / Q000235:genetics*; D005787:Gene Frequency; D011058:Pollen / Q000235:genetics*; D012639:Seeds / Q000235:genetics*