title: New consistent QTL in pea associated with partial resistance to Aphanomyces euteiches in multiple French and American environments.
abstract: Partial resistances, often controlled by quantitative trait loci (QTL), are considered to be more durable than monogenic resistances. Therefore, a precursor to developing efficient breeding programs for polygenic resistance to pathogens should be a greater understanding of genetic diversity and stability of resistance QTL in plants. In this study, we deciphered the diversity and stability of resistance QTL to Aphanomyces euteiches in pea towards pathogen variability, environments and scoring criteria, from two new sources of partial resistance (PI 180693 and 552), effective in French and USA infested fields. Two mapping populations of 178 recombinant inbred lines each, derived from crosses between 552 or PI 180693 (partially resistant) and Baccara (susceptible), were used to identify QTL for Aphanomyces root rot resistance in controlled and in multiple French and USA field conditions using several resistance criteria. We identified a total of 135 additive-effect QTL corresponding to 23 genomic regions and 13 significant epistatic interactions associated with partial resistance to A. euteiches in pea. Among the 23 additive-effect genomic regions identified, five were consistently detected, and showed highly stable effects towards A. euteiches strains, environments, resistance criteria, condition tests and RIL populations studied. These results confirm the complexity of inheritance of partial resistance to A. euteiches in pea and provide good bases for the choice of consistent QTL to use in marker-assisted selection schemes to increase current levels of resistance to A. euteiches in pea breeding programs.
authors.affiliation: Université de Rennes 1, Amélioration des Plantes et Biotechnologies Végétales, Rennes, France. hamon@vegenov.com
authors.forename: Céline
authors.initials: C
authors.lastname: Hamon
authors.forename: Alain
authors.initials: A
authors.lastname: Baranger
authors.forename: Clarice J
authors.initials: CJ
authors.lastname: Coyne
authors.forename: Rebecca J
authors.initials: RJ
authors.lastname: McGee
authors.forename: Isabelle
authors.initials: I
authors.lastname: Le Goff
authors.forename: Virginie
authors.initials: V
authors.lastname: L'anthoëne
authors.forename: Robert
authors.initials: R
authors.lastname: Esnault
authors.forename: Jean-Philippe
authors.initials: JP
authors.lastname: Rivière
authors.forename: Anthony
authors.initials: A
authors.lastname: Klein
authors.forename: Pierre
authors.initials: P
authors.lastname: Mangin
authors.forename: Kevin E
authors.initials: KE
authors.lastname: McPhee
authors.forename: Martine
authors.initials: M
authors.lastname: Roux-Duparque
authors.forename: Lyndon
authors.initials: L
authors.lastname: Porter
authors.forename: Henri
authors.initials: H
authors.lastname: Miteul
authors.forename: Angélique
authors.initials: A
authors.lastname: Lesné
authors.forename: Gérard
authors.initials: G
authors.lastname: Morin
authors.forename: Caroline
authors.initials: C
authors.lastname: Onfroy
authors.forename: Anne
authors.initials: A
authors.lastname: Moussart
authors.forename: Bernard
authors.initials: B
authors.lastname: Tivoli
authors.forename: Régine
authors.initials: R
authors.lastname: Delourme
authors.forename: Marie-Laure
authors.initials: ML
authors.lastname: Pilet-Nayel
mesh_terms: D044744:Aphanomyces / Q000472:pathogenicity*; D002874:Chromosome Mapping; D032461:Chromosomes, Plant; D003433:Crosses, Genetic; D005602:France; D008040:Genetic Linkage; D005838:Genotype; D007113:Immunity, Innate; D018532:Pisum sativum / Q000235:genetics* / Q000276:immunology / Q000382:microbiology; D010641:Phenotype; D010935:Plant Diseases / Q000235:genetics / Q000276:immunology; D018517:Plant Roots / Q000235:genetics / Q000276:immunology / Q000382:microbiology; D040641:Quantitative Trait Loci; D014481:United States