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Diversité et combinaison des modes d'actions des QTL de résistance à Aphanomyces euteiches chez le pois

Abstract : Knowledge of the effects and action modes of resistance QTL to plant diseases is a major challenge for the durable use of genetic resistances in agriculture. In the pea/Aphanomyces euteiches pathosystem, which has a major economic importance, the aim of this study was to validate the single or combined effects of main resistance QTL, and study their action modes on steps of the pathogen life cycle. A total of 157 pea NILs (Near Isogenic Lines) created by Marker-Assisted Back-crossing and carrying no, one, two or three of the seven main resistance QTL previously identified, was genotyped using a 15K SNPs array and evaluated for resistance. The NILs carrying major-effect QTL, individually or in combination with minor-effect QTL, had increased levels of partial resistance in controlledconditions and in the field compared to NILs without QTL, in different genetic backgrounds. Several NILs carrying single or multiple minor-effect QTL also showed reduced levels of disease severity in one or the two test conditions. Most of the QTL had significant effects on slowing down infection and/or pathogen DNA quantity which had colonized the root for seven days after inoculation. This study gives tools and information for the choice of resistance QTL to use in pyramiding breeding strategies for increasing partial levels of resistance to A. euteiches in future pea varieties.
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https://tel.archives-ouvertes.fr/tel-01493826
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Submitted on : Wednesday, March 22, 2017 - 10:55:06 AM
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  • HAL Id : tel-01493826, version 1

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Clément Lavaud. Diversité et combinaison des modes d'actions des QTL de résistance à Aphanomyces euteiches chez le pois. Biologie végétale. Agrocampus Ouest, 2015. Français. ⟨NNT : 2015NSARC121⟩. ⟨tel-01493826⟩

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