Long distance pollen-mediated gene flow at a landscape level: the weed beet as a case study.

摘要: Gene flow is a crucial parameter that can affect the organization of genetic diversity in plant species. It has important implications terms conservation resources and gene exchanges between crop to wild relatives within species complex. In Beta vulgaris complex, hybridization beets seed production areas well documented role ensuing hybrids, weed beets, as bridges towards forms sugar beet have been shown. Indeed, contrast cultivated are bi-annual, bolt, flower reproduce same season. Nonetheless, extent pollen dispersal through weedy lineages remains unknown. this study, focus directed weed-to-weed flow, we report results pollen-dispersal analysis an agricultural landscape composed five fields with different levels infestation by beets. Our results, based on paternity 3240 progenies from 135 maternal plants using 10 microsatellite loci, clearly demonstrate even if mostly pollinated individuals field, some mating events occur situated several kilometres apart (up 9.6 km), rates interfield-detected paternities ranging 11.3% 17.5%. Moreover, show appears be more restricted when aggregated most occurred only for short-distance classes. The best-fit curves were fat-tailed geometric functions populations exhibiting low densities thin-tailed Weibull function high densities. Thus, characterized density geographically isolated may difficult detect but likely act traps emitted close remote fields. Hence, it evident interfield pollen-mediated almost unavoidable could contribute diffusion ( trans )genes landscape.