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No resistance is sacrosanct: unveiling the genes controlling quantitative resistance to Melampsora larici-populina in interspecific hybrid poplars and quantifying potential adaptation of the pathogen

hal.structure.identifierUnité de recherche Amélioration, Génétique et Physiologie Forestières [AGPF]
dc.contributor.authorDOWKIW, Arnaud
hal.structure.identifierUnité de recherche Amélioration, Génétique et Physiologie Forestières [AGPF]
dc.contributor.authorJORGE, Véronique
hal.structure.identifierUnité de recherche Amélioration, Génétique et Physiologie Forestières [AGPF]
dc.contributor.authorVOISIN, Elodie
hal.structure.identifierUnité de recherche en génomique végétale [URGV]
dc.contributor.authorFAIVRE-RAMPANT, Patricia
hal.structure.identifierUnité de recherche en génomique végétale [URGV]
dc.contributor.authorBRESSON, Alois
hal.structure.identifierUnité de recherche en génomique végétale [URGV]
dc.contributor.authorBITTON, Frederique
hal.structure.identifierInteractions Arbres-Microorganismes [IAM]
dc.contributor.authorDUPLESSIS, Sébastien
hal.structure.identifierInteractions Arbres-Microorganismes [IAM]
dc.contributor.authorFREY, Pascal
hal.structure.identifierInteractions Arbres-Microorganismes [IAM]
dc.contributor.authorKOHLER, Annegret
hal.structure.identifierInteractions Arbres-Microorganismes [IAM]
dc.contributor.authorRINALDI, Cécile
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorPLOMION, Christophe
hal.structure.identifierBiodiversité, Gènes & Communautés [BioGeCo]
dc.contributor.authorLALANNE, Céline
hal.structure.identifierUnité de recherche Amélioration, Génétique et Physiologie Forestières [AGPF]
dc.contributor.authorBASTIEN, Catherine
dc.date.issued2010
dc.date.conference2010-05-03
dc.description.abstractEnBecause of its mixed mating system and high potential gene flow, Melampsora larici-populina belongs to the group of pathogens with the highest evolutionary risk. Indeed, all qualitative resistances that have been selected by breeders during the last decades have been defeated. Although quantitative resistance (QR) is often considered more durable, a multidisciplinary approach is being conducted at INRA not only to identify the genes controlling QR but also to predict potential adaptation of the pathogen. Starting with a single Populus deltoides × P. trichocarpa F 1 pedigree, this work led to the identification of several QTLs with contrasted levels of effect and strain-specificity. Much attention is being paid to two major loci, R 1 and R US , that both map on LG XIX. Dominant allele R 1 is inherited from P. deltoides. It controls a qualitative resistance to M. larici-populina, and it was found to be statistically associated with QR levels in several P. deltoides × P. trichocarpa F 1 progenies. Dominant allele R US is inherited from P. trichocarpa. It has major effect of uredinia size and other QR components in both intraspecific and interspecific F 1 progenies. Fine mapping of R US is being conducted using a 1300 genotype F 1 host progeny, and a BAC library was constructed to generate a physical map of 2000 kb around R US . A promising BAC clone has been identified and sequenced. In parallel, an expressional approach based on the analysis of R US and r US infected material generated transcriptional and translational candidates. On the pathogen side, one strain was found to be able to circumvent R US , thus offering the opportunity to study the frequency and the mechanisms of adaptation to QR. Several populations of M. larici-populina that underwent contrasted selection pressures by R US are being characterized for their phenotypes and for their genotypes at several microsatellite loci. The first results demonstrate the existence of preadaptation in “wild” pathogen Populations and a clear selective pressure by the host.
dc.language.isoen
dc.publisherMPU - Mediterranean Phytopathological Union
dc.publisher.locationFlorence (italy)
dc.source.titlePhytopathologia Mediterranea
dc.subjectMELAMPSORA LARICI-POPULINA
dc.subjectQUANTITATIVE TRAIT LOCI
dc.subjectPEUPLIER
dc.subject.enGENE IDENTIFICATION
dc.subject.enQUALITATIVE RESISTANCE
dc.subject.enIDENTIFICATION DE GENES
dc.title.enNo resistance is sacrosanct: unveiling the genes controlling quantitative resistance to Melampsora larici-populina in interspecific hybrid poplars and quantifying potential adaptation of the pathogen
dc.typeCommunication dans un congrès
dc.subject.halSciences du Vivant [q-bio]
bordeaux.volume49
bordeaux.issue3
bordeaux.conference.title4. International Rusts of Forest Trees Conference. IUFRO Working Party 02.07.05
bordeaux.countryIT
bordeaux.title.proceedingPhytopathologia Mediterranea
bordeaux.conference.cityFlorence
bordeaux.peerReviewednon
hal.identifierhal-02754692
hal.version1
hal.invitedoui
hal.conference.end2010-05-06
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02754692v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.btitle=Phytopathologia%20Mediterranea&rft.date=2010&rft.volume=49&rft.issue=3&rft.au=DOWKIW,%20Arnaud&JORGE,%20V%C3%A9ronique&VOISIN,%20Elodie&FAIVRE-RAMPANT,%20Patricia&BRESSON,%20Alois&rft.genre=unknown


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