Patterns of sex ratio variation among populations of the gynodioecious Geranium maculatum
While most plant species are hermaphroditic, systems with separate sexes have evolved independently multiple times across the angiosperms. One such system is gynodioecy, in which females and hermaphrodites co-occur in the species. Interestingly, the sex ratio varies widely across populations. To elucidate processes that shape to the population female frequency, we used G. maculatum, a perennial species common throughout eastern North America in which populations vary from 0-35% female. We analyzed population genetic structure across twenty-eight populations located along a north-south transect in the eastern US and found lower gene flow rates in high female frequency populations. Additionally, we examined patterns of gene flow within populations and found reduced pollen dispersal distances when females are present. This has implications for the evolution and maintenance of gynodioecy in G. maculatum.
Venez nombreux salle Louis Thaler à 11h30, bâtiment 22 au 2e étage à l’ISEM
Bon séminaire !