Search results for "grapevine"

Impacts of climate change on the performance of an insect pest and associated consequences for tritrophic interactions

2019

Global warming poses a major challenge to living organisms, particularly for ectothermic animals like insects, whose physiology and behaviour are closely related with direct thermal surroundings. This thesis aims at experimentally investigating the impacts of climate change on the overall performance of a major grapevine pest, the European grapevine moth (Lobesia botrana), and the associated consequences for interactions involving this phytophagous insect and adjacent trophic levels, more specifically natural enemies (parasitoids). The experiments conducted focus on three facets of climate change: an increase in mean temperature, an alteration of daily thermal range, and the occurrence of h…

Impact of biostimulants on the resistance induction level of grapevine to downy mildew by elicitors

2018

The protection of vineyards against cryptogamic diseases such as downy mildew is mainly ensured by synthetic fungicides, which cause serious environmental and health problems. The induction of resistance by elicitors could allow to reduce their use. However, even if their efficacy is demonstrated in greenhouse conditions, it remains quite variable in field conditions. Indeed, the efficacy of an elicitor depends on the plant’s ability to respond, or more generally, on the latter’s physiological status. In this context, part of the FUI project IRIS+, the aim of this present work is to evaluate whether biostimulants, through their effect on the plant’s physiology, would be able to increase the…

Impact of stresses associated to climate changes on natural and induced grapevine resistance to pathogens

2013

National audience; France is a worldwide leader in grape production and has to face global changes including climate evolution and transitions towards sustainable systems of production. One major problem in viticulture is indeed the high susceptibility of most of the grown cultivars to cryptogamic diseases, such as downy mildew (Plasmopara viticola). Maintaining a satisfactory health status of grapevine currently requires numerous fungicide treatments. However, in an objective of sustainable viticulture, there is increasing societal request, winegrower awareness, and political incitation to reduce this use of pesticides. For these reasons, alternative strategies of protection are currently …

Transcriptomes of compatible and non-compatible gray mold/grapevine interactions compared in search of resistance factors

2012

National audience; Gray mold (Botrytis cinerea) causes significant annual yield and quality losses to viticulture. Comparison of transcriptomes of compatible and non-compatible interaction with Vitis vinifera cv Marselan – on harvesting stage berries or véraison stage berries, respectively – suggest the jasmonic acid pathway is activated in the former, while the salicylic acid pathway is more pronounced in the latter. In addition, in the non-compatible case, reactive oxygen species accumulation seems to be both early and strong, and some genes involved in cell-wall reinforcement are up-regulated.

A new tool for assessment of biostimulants effects on grapevine

2018

National audience; Despite an increasing interest for the use of biostimulants (BS) in agriculture, methods allowing a precise description of their effects on plants remain rather limited. In the IRIS+ FUI project, two major and highly different worldwide crops, wheat (annual, monocotyledon) and grapevine (perennial, broadleaf) were chosen to deepen our knowledge of such compounds and explore their potential additional interest. One objective was to develop a tool adapted to the screening and study of the impact of a series of BS on the development and physiology of these crops in controlled conditions. We managed to develop such a tool adapted to grapevine herbaceous cuttings. It allows a …

Imagerie pour les maladies de la vigne

2013

La viticulture est confrontée à des problèmes majeurs dont la lutte contre les maladies cryptogamiques telles que l’oïdium ou la pourriture grise. Elle utilise alors majoritairement des produits phytosanitaires de synthèse susceptibles de poser des problèmes environnementaux et sanitaires, et de favoriser la sélection de souches de microorganismes pathogènes résistantes. Dans le cadre du plan Ecophyto 2018, la recherche de méthodes visant à diminuer, voire à remplacer, les fongicides de synthèse au vignoble, a pris toute sa place. Deux approches peuvent alors être conduites pour répondre à cet objectif : 1) la réduction du nombre de traitements et des doses appliquées et 2) le développement…

Sesquiterpenes VOCs are markers of elicitation by sulfated laminarine in grapevine

2016

International audience

Volatilomics in the vineyard

2017

SPE IPM CNRS INRA UB; National audience

Image analysis methods for assessment of H2O2 production and Plasmopara viticola development in grapevine leaves: application to the evaluation of re…

2014

ß-1,4 cellodextrins, ß-1,3 glucans and a-1,4 oligogalacturonides are potent elicitors of various defense-related responses in grapevine

2007

International audience; Plant cell-wall degradation products can be considered as ‘microbe-induced molecular patterns’ (MIMPs) recognized through plant receptors as ‘pathogen-induced modified self’. So cell-wall oligosaccharides originating from plants can play an important role in the perception of the invading pathogen by the plant. Cellodextrins (CD) are the end-products from cellulose degradation in plant cell walls, consisting og a linear ß-(1,4) linked glucose backbone. The role of these oligosaccharides in triggering plant defense reactions has not yet been established. Here, we investigated the elicitor activity of CD oligomers in grapevine cells. We show that CD triggered induction…