BARTHOLOME, Jérôme; BRACHI, Benjamin; MARÇAIS, Benoit; MOUGOU, Amira; BODENES, Catherine; PLOMION, Christophe; ROBIN, Cécile; DESPREZ-LOUSTAU, Marie Laure

doi:10.1111/nph.16319

Métadonnées

Licence d’utilisation du document

BARTHOLOME, Jérôme
Biodiversité, Gènes & Communautés [BioGeCo]
Amélioration génétique et adaptation des plantes méditerranéennes et tropicales [UMR AGAP]

BRACHI, Benjamin
Biodiversité, Gènes & Communautés [BioGeCo]

MARÇAIS, Benoit
Interactions Arbres-Microorganismes [IAM]

Langue

Article de revue

Ce document a été publié dans

New Phytologist. 2019, vol. online first, p. 1-16

Wiley

Résumé en anglais

Exotic pathogens cause severe damage in natural populations in the absence of coevolutionary dynamics with their hosts. However, some resistance to such pathogens may occur in naive populations. The objective of this study was to investigate the genetics of this so-called 'exapted' resistance to two pathogens of Asian origin (Erysiphe alphitoides and Phytophthora cinnamomi) in European oak. Host-pathogen compatibility was assessed by recording infection success and pathogen growth in a full-sib family of Quercus robur under controlled and natural conditions. Two high-resolution genetic maps anchored on the reference genome were used to study the genetic architecture of resistance and to identify positional candidate genes. Two genomic regions, each containing six strong and stable quantitative trait loci (QTLs) accounting for 12-19% of the phenotypic variation, were mainly associated with E. alphitoides infection. Candidate genes, especially genes encoding receptor-like-kinases and galactinol synthases, were identified in these regions. The three QTLs associated with P. cinnamomi infection did not colocate with QTLs found for E. alphitoides. These findings provide evidence that exapted resistance to E. alphitoides and P. cinnamomi is present in Q. robur and suggest that the underlying molecular mechanisms involve genes encoding proteins with extracellular signaling functions.< Réduire

Mots clés

Quercus robur

quantitative trait loci (QTL)

Mots clés en anglais

Erysiphe alphitoides

Phytophthora cinnamomi

disease resistance

exapted resistance

powdery mildew

receptor-like kinase