Gene flow within a population of the outbreeding Sinapis arvensis: isozyme analysis of half‐sib families

Abstract

SummaryProgeny of several Sinapis arvensis L. plants sampled in a field were analysed for isozyme patterns at two highly polymorphic loci: esterasc and acid phosphatase. Allele frequencies of pollen subpopulations that effectively fertilized each separate sampled plant were compared. In spite of self‐incompatibility, large variations in allele frequencies were shown among pollen subpopulations. Non‐random mating owing to gametic selection and plant density effects were evidenced and could reduce gene flow within a population,