Abstract: The evolution of resistance in response to herbicides is a striking example of repeated, human-induced evolution. While much is known about the effects of particular point mutations that confer resistance, the extent to which they arise repeatedly de novo, draw from standing variation, or spread across populations through gene flow is unclear. Beyond these simple mutations, complex genetic bases such as gene amplification and polygenic architectures also contribute to resistance in weed populations but have yet to be described at a genomic level. I quantify the repeatability of resistance evolution across these genomic architectures by characterizing adaptive origins and heterogeneity in the spread of resistance across the landscape. Lastly, I discuss the potential of a paired historical-contemporary genomic sequencing and phenotyping approach for better understanding adaptation to agricultural environments over the last two centuries.
Wednesday February 10, 2021
12:00 pm - 01:00 pm
THE REPEATABILITY AND GENOMIC ARCHITECTURE OF HERBICIDE RESISTANCE EVOLUTION
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Loren Rieseberg and Judith Mank
University of Toronto
Biodiversity Seminar Series