Recherche de nouvelles variétés de triticale plus résistantes à l'oïdium

Abstract

National audienceTo face the recent emergence of powdery mildew on triticale species, a collaborative programmebetween breeders, public research and technical institute has been conducted from 2008 to 2011 withfinancial support of French Agriculture Ministry. The aims were: a survey of disease evolution, a betterknowledge of pathogen virulence, finding new and varied resistance genes to create new resistantvarieties, a better understanding of genetic resistance and especially durable resistance. Now, we knowthat powdery mildew on triticale came from bread wheat formae speciales. We identified bread wheatgenes that seem to be efficient against triticale powdery mildew (Pm1-Chopin’s allele, Pm3d, Pm4,MlTo, MlSo especially and in a lesser extend MlSi2, MlTa2 et Mld). We identified resistant genotypes(genetic resources and material derived from new wheat x rye crosses) and potential molecular SSRmarkers from bibliography and from segregating triticale populations. Nevertheless, several pointsremain to be investigated more deeply