4.7 Article

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

Journal

JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 69, Issue 6, Pages 1781-1795

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.0c06103

Keywords

BTH; MeJA; phosphonates; Vitis vinifera; PDS; polyphenols; Plasmopara viticola; gene expression

Funding

  1. CIVB (Interprofessional Committee of Bordeaux Vines)
  2. Institute National de la Recherche Agronomique pour l'agriculture, l'alimentation et l'environnement (INRAE) Bordeaux Aquitaine
  3. French Government
  4. French Embassy in Poland
  5. MetaboHUB [ANR-11-INBS-0010]
  6. Bordeaux Metabolome Facility

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Three recognized plant defense stimulators (PDS), methyl jasmonate (MeJA), benzothiadiazole (BTH) and phosphonates (PHOS), were shown to confer resistance to the biotrophic pathogen Plasmopara viticola when sprayed on grapevine Vitis vinifera cuttings. The effects on molecular defense-related genes and polyphenol content were observed, with specific signaling pathways for each elicitor and some cross-talks. These results provide evidence of the different modes of action of PDS in sustainable viticulture.
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 e-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.

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