How teosinte became a weed in Europe: the role of genetic exchange with cultivated maize
VisioSémIDEEV à l’UMR Génétique Quantitative et Évolution – Le Moulon
sur https://office.moulon.inra.fr/nextcloud/index.php/apps/bbb/b/LjJcnAyxc2bzq8tf
Vendredi 6 novembre 2020 à 12h00
Valérie LE CORRE
INRAE - UMR 1347 Agroécologie, Dijon
invitée par Maud Tenaillon
« How teosinte became a weed in Europe: the role of genetic exchange with cultivated maize »
Abstract
The emergence of new weeds poses a serious threat to agricultural production. Understanding their origin and evolution is therefore of major importance. We analyzed the intriguing case of teosinte, a wild relative of maize originating from Mexico that recently emerged as an invasive weed in maize fields in Europe. Patterns of genetic variation revealed extensive genetic introgression from maize adapted to temperate latitudes into European teosintes. Introgressed genomic regions harbored a key flowering time gene and an herbicide resistance gene. Our results exemplify how adaptive introgression can drive the evolution of a crop’s wild relative into a weed. Hybridization is an evolutionary force that should not be underestimated when forecasting invasiveness risks.
Voir aussi :
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Le Corre V, Siol M, Vigouroux Y, Tenaillon MI, Délye C. (2020) Adaptive introgression from maize has facilitated the establishment of teosinte as a noxious weed in Europe. Proc Natl Acad Sci U S A. 2020 Sep 28:202006633. doi: 10.1073/pnas.2006633117 - @PNASNews