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Advisor(s)
Abstract(s)
The biotrophic fungus Erysiphe necator causes powdery mildew (PM) in grapevine. Phytohormones are major modulators
of defensive responses in plants but the analysis of the hormonome associated with grapevine tolerance and susceptibility
against this pathogen has not been elucidated. In this study, changes in hormonal profiling were compared between a tolerant
(Vitis rupestris × riparia cv. 101-14 Millardet et de Grasset) and a susceptible (Vitis vinifera cv. Aragonêz) species upon E.
necator infection. Control and PM-infected leaves were collected at 0, 6, 24, 96 h post-infection (hpi), and analysed through
LC-MS/MS. The results showed a distinct constitutive hormonome between tolerant and susceptible species. Constitutive
high levels of salicylic acid (SA) and indole-3- acetic acid together with additional fast induction of SA within the first 6 hpi
as well as constitutive low levels of jasmonates and abscisic acid may enable a faster and more efficient response towards the
PM. The balance among the different phytohormones seems to be species-specific and fundamental in providing tolerance or
susceptibility. These insights may be used to develop strategies for conventional breeding and/or editing of genes involved
in hormonal metabolism aiming at providing a durable resistance in grapevine against E. necator
Description
Keywords
Erysiphe necator grapevine hormones powdery mildew tolerance susceptibility
Pedagogical Context
Citation
Journal of Plant Growth Regulation, 2-s2.0-85139659194
Publisher
Springer