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CODEVI-SDP -Mesurer et caractériser les Composés Organiques Volatils de la vigne comme réponse à une application d'un produit Stimulateur des Défenses des Plantes

Abstract : Volatile organic compounds (VOCs) are molecules emitted into the air by the plant during a stress, as the attack of a pest. The objective of the CODEVI SDP project (2017-2019) was to characterize the VOCs emitted by the vine after being treated with registered Plant Defence Inducers (PDI) and to inform whether there is a correlation between this emission and the resistance induced against downy mildew (P. viticola). This emission measurement could be an index to validate a plant response to the action of a PDI application and to improve their practical use at the vineyard. The project was conducted in Burgundy and Bordeaux vineyards and joined research and technical teams (UMR AE, IFV and University of Bordeaux) of these territories for the experimentations. The expertise in the measurement and analysis of VOCs was provided by the ICOA laboratory (CNRS Orléans). The main part of the measurements was carried out based on the theoretical triptych that should follow the application of the PDI: emission of VOCs by the vine / expression of defence molecules in the leaves / efficiency in control of P. viticola. In controlled conditions, using leaf cuttings under confined atmosphere, UMR AE showed the performance of Twister® sensors, and that some specific VOCs were emitted after application of PDIs (including the registered product Bastid®), notably the sesquiterpenes beta-caryophyllene and alpha-farnesene and an increase of stilbenes in leaves. Nevertheless, straight correlation between those production and protection against downy mildew is not obvious and rather suggests combined actions of numerous molecules to build an efficient defence. In the vineyard, on microplots of vines, the results are less clear and the signals weaker. The first VOCs capture methodology that was proposed was not indicative in a such open atmosphere and in presence of numerous uncontrollable parameters. Thus, it was modified with bagged branches to concentrate the VOCs response on the sensors. Moreover, the PDI Bastid® showed only poor levels of protection against downy mildew in the pathotests performed on leaf discs and no control in the vineyard. From the results harvested during the three years, under three extremely different environmental conditions, the initial triptych was not established in this part of the project. Nevertheless, some global profiles could be highlighted, with noticeable terpene amounts of beta-ocimene and beta-caryophyllene within the scent of the elicited vineyard.
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https://hal.inrae.fr/hal-03612694
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Submitted on : Friday, March 18, 2022 - 8:29:44 AM
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Nicolas Aveline, Christelle Lemaitre-Guillier, A. Douillet, Stéphanie Cluzet, Josep Valls Fonayet, et al.. CODEVI-SDP -Mesurer et caractériser les Composés Organiques Volatils de la vigne comme réponse à une application d'un produit Stimulateur des Défenses des Plantes. Innovations Agronomiques, INRAE, 2022, 85, pp.73-82. ⟨10.17180/ciag-2022-vol85-art06⟩. ⟨hal-03612694⟩

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