Rôle de l’architecture racinaire dans le contrôle génétique de la diminution des symptômes de pourriture racinaire dus à Aphanomyces euteiches chez le pois (Pisum sativum)

Abstract : In a sustainable agriculture context, breeding for varieties combining genetic resistance and plant architecture is of major interest to limit diseases impacts in crops. The aim of this thesis was to analyze the interpendance of the genetic determinants of root architecture and resistance to Aphanomyces euteiches, a major soil born pathogen of peas. A genome wide association analysis among a 266-pea-line collection enabled us to pinpoint a total of 150 loci associated with resistance and plant architecture, and to compare them with QTL detected in previous studies. A common major locus was associated with resistance and an intrinsic root architecture trait.Several loci were detected for both resistance and disease-induced architecture. The combination of resistance and some architecture traits in selected pea lines was associated with reduced yield losses in infested fields. Results provide original knowledge on comparative genetics of disease resistance and plant architecture for root rot diseases. They provide tools (SNPs and marker haplotypes), parental lines and information for the choice of resistance and architecture QTL to combine in breeding strategies to improve resistance to A. euteiches in future pea varieties.
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Aurore Desgroux. Rôle de l’architecture racinaire dans le contrôle génétique de la diminution des symptômes de pourriture racinaire dus à Aphanomyces euteiches chez le pois (Pisum sativum). Biologie végétale. Agrocampus Ouest, 2016. Français. ⟨NNT : 2016NSARA076⟩. ⟨tel-01615191v2⟩

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