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Differential selection pressures exerted by host resistance quantitative trait loci on a pathogen population: a case study in an apple Venturia inaequalis pathosystem

Amandine Lê Van 1, 2 Valérie Caffier 2, 1 Pauline Lasserre-Zuber 1, 2 Aurélie Chauveau 3 Dominique Brunel 3 Bruno Le Cam 1, 2 Charles-Eric Durel 1, 2, *
* Corresponding author
1 PAVE - INH : Pathologie végétale : biodiversité, écologie, interactions bioagresseurs-plantes
2 IRHS - Institut de Recherche en Horticulture et Semences
3 EPGV - Etude du Polymorphisme des Génomes Végétaux
Abstract : Understanding how pathogens evolve according to pressures exerted by their plant hosts is essential for the derivation of strategies aimed at the durable management of resistant cultivars. The spectrum of action of the resistance factors in the partially resistant cultivars is thought to be an important determinant of resistance durability. However, it has not yet been demonstrated whether the pressures exerted by quantitative resistance are different according to their spectrum of action. * To investigate selection pressures exerted by apple genotypes harbouring various resistance quantitative trait loci (QTLs) on a mixed inoculum of the scab disease agent, Venturia inaequalis, we monitored V. inaequalis isolate proportions on diseased apple leaves of an F1 progeny using quantitative pyrosequencing technology and QTL mapping. * Broad-spectrum resistances did not exert any differential selection pressures on the mixed inoculum, whereas narrow-spectrum resistances decreased the frequencies of some isolates in the mixture relative to the susceptible host genotypes. * Our results suggest that the management of resistant cultivars should be different according to the spectrum of action of their resistance factors. The pyramiding of broad-spectrum factors or the use of a mixture of apple genotypes that carry narrow-spectrum resistance factors are two possible strategies for the minimization of resistance erosion.
keyword : durability broad-spectrum resistance Venturia inaequalis Malusx domestica quantitative pyrosequencing quantitative resistance resistance erosion selection pressure Venturia inaequalis.
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Submitted on : Friday, February 22, 2013 - 4:27:20 PM
Last modification on : Wednesday, April 6, 2022 - 4:08:19 PM

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Amandine Lê Van, Valérie Caffier, Pauline Lasserre-Zuber, Aurélie Chauveau, Dominique Brunel, et al.. Differential selection pressures exerted by host resistance quantitative trait loci on a pathogen population: a case study in an apple Venturia inaequalis pathosystem. New Phytologist, Wiley, 2013, 197 (3), pp.899-908. ⟨10.1111/nph.12086⟩. ⟨hal-00793630⟩

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