American Chemical Society
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Three Types of Elicitors Induce Grapevine Resistance against Downy Mildew via Common and Specific Immune Responses

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journal contribution
posted on 2021-02-02, 21:32 authored by Aleksandra Burdziej, Anthony Bellée, Enora Bodin, Josep Valls Fonayet, Noël Magnin, Anna Szakiel, Tristan Richard, Stéphanie Cluzet, Marie-France Corio-Costet
Three recognized plant defense stimulators (PDS), methyl jasmonate (MeJA), benzothiadiazole (BTH) and phosphonates (PHOS), were sprayed on grapevine Vitis vinifera cuttings and conferred resistance to the biotrophic pathogen Plasmopara viticola. The effects on molecular defense-related genes and polyphenol content (stilbenes and flavanols) were revealed at 6 and 8 days post-elicitation. The transcript accumulation was consistent with the signaling pathway specific to the elicitor, salicylic acid for BTH, and jasmonic acid for MeJA, with some cross-talks. PHOS tended to modulate the defense responses like BTH. Moreover, in response to a downy mildew inoculation, the leaves pre-treated with PHOS and BTH overproduced pterostilbene, and after MeJA treatment, piceids and ε-viniferin, compared to uninoculated elicitor-treated leaves. These results provide evidence of the different modes of action of PDS and their role in sustainable viticulture.