A vast collaborative study has just been published by researchers from the Chair on the distribution of genetic diversity throughout the entire range of this pioneer species, which covers most of the North American continent from Canada to Mexico. The distribution of genomic diversity, estimated using a large number of populations, appeared highly geographically structured. Signatures of genetic adaptation to regional climate were detected, especially for water stress. Other factors were also investigated, such as polyploidy and seed germination, for which significant regional differences were also observed. Link to the complete publication here.