Jeudi 9 mai 2019 à 14h00 – Salle 106 (Cœur d’Ecole)
The genomic basis for phenotypic evolution of environmental adaptation in maize
(Université Delaware – Etats Unis)
Understanding the genomic basis of environmental adaptation is central to mining exotic haplotypes for the development of next-generation crop cultivars. Using a novel, integrated study design allowing for simultaneous inference on population and quantitative genetic aspects of phenotypic evolution, we investigated a maize landrace of tropical origin that was phenologically adapted to a temperate environment over the course of ten generations. Our results show that a finite polygenic, multi-haplotypic architecture with transient shifts in haplotype frequencies underlie a 26-day mean decrease in female-flowering time across generations. We are now beginning to examine genomic features that could predict unanticipated shifts in the genomic response to selection and aim to integrate this into a new genomic selection approach for rapidly adapting maize populations to new environments.
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