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Hormonal changes in tolerant and susceptible grapevine leaves under powdery mildew infection
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Orientador(es)
Resumo(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 hours 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 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.
Descrição
XIII. International Symposium on Grapevine Breeding and Genetics, 10th July - 15th July 2022
Palavras-chave
erysiphe necator grapevine hormones powdery mildew tolerance susceptibility
Contexto Educativo
Citação
Amaro, R., Diniz, I., Santos, H., Pimentel, D. Rego, C., Mithöfer, A., Fortes, A.M. Hormonal changes in tolerant and susceptible grapevine leaves under powdery mildew infection. In: XIII. International Symposium on Grapevine Breeding and Genetics, 10th July - 15th July 2022, Landau/Pfalz, Alemanha