title: A faster and a stronger defense response: one of the key elements in grapevine explaining its lower level of susceptibility to Esca?
abstract: Wood diseases like Esca are among the most damaging afflictions in grapevine. The defense mechanisms in this plant-pathogen interaction are not well understood. As some grapevine cultivars have been observed to be less susceptible to Esca than others, understanding the factors involved in this potentially stronger defense response can be of great interest. To lift part of this veil, we elicited Vitis vinifera plants of two cultivars less susceptible to Esca ('Merlot' and 'Carignan') and of one susceptible cultivar ('Cabernet Sauvignon'), and monitored their defense responses at the leaf level. Our model of elicitation consisted in grapevine cuttings absorbing a culture filtrate of one causal agent of Esca, Phaemoniella chlamydospora. This model might reflect the early events occurring in Esca-affected grapevines. The two least susceptible cultivars showed an earlier and stronger defense response than the susceptible one, particularly with regard to induction of the PAL and STS genes, and a higher accumulation of stilbene compounds and some pathogenesis-related proteins.
authors.forename: Carole
authors.initials: C
authors.lastname: Lambert
authors.forename: Ian Li Kim
authors.initials: IL
authors.lastname: Khiook
authors.forename: Sylvia
authors.initials: S
authors.lastname: Lucas
authors.forename: Nadège
authors.initials: N
authors.lastname: Télef-Micouleau
authors.forename: Jean-Michel
authors.initials: JM
authors.lastname: Mérillon
authors.forename: Stéphanie
authors.initials: S
authors.lastname: Cluzet
mesh_terms: D001203:Ascomycota; D004198:Disease Susceptibility; D018506:Gene Expression Regulation, Plant; D010935:Plant Diseases / Q000235:genetics; D018515:Plant Leaves / Q000235:genetics; D027843:Vitis / Q000235:genetics