XVI International Botanical Congess

Patterns of mating can be influenced by the landscape context of the maternal plants. Here, we use allozymes to evaluate the distribution of adult and progeny genotypes of Quercus alba across an Ozark landscape. We examine genetic heterogeneity of adult populations and the effect of environmental factors. Then, we describe mating patterns of maternal plants by quantifying outcrossing rate and pollen pool heterogeneity. Adult populations exhibit a great deal of differentiation that is not explained by restricted gene flow but is accounted for by forest structure and density variables. Analysis of progeny from maternal plants indicates variation in outcrossing rate and pollen pools across maternal plants that indicates an impact of environmental and genetic heterogeneity associated with landscape context.