Study of the stress-related signalling of endoplasmic reticulum in grapevine immunity associated to LysM receptor kinases (VvLYKs)

In the actual situation of decreasing the use of chemicals in agriculture, enhancing our understanding of plant immunity is a critical task to develop more sustainable plant health protection methods. An interesting strategy is to study how plants, and in particular grapevine, perceives and responds to different microorganisms. Microorganisms are notably recognizedby LysM Receptor-like Kinase (LYKs) and previous works have identified 16 LYKs encoded by the grapevine genome (VvLYKs) (Roudaire et al. 2023). Among them, VvLYK1-1, VvLYK1-2 and VvLYK5-1 are involved in chitin perception and thus play a role in the plant immunity. Interestingly, immune responses are also involved during symbiotic…

USE OF ALGINATES OLIGOMERS TO IMPROVE PLANT PROTECTION AGAINST PATHOGENS

The invention concerns the use of alginate oligomers in sequence α(1-4)Guluronane and/or ß(1-4)Mannuronane having a DP greater than 30, as an active ingredient of biocontrol products in plants, and that may be combined with another molecules such as phytohormones, against cryptogamic diseases of plants, in particular of vine (Vitis vinifera), or to protect other species against aggressors such as pathogenic microbes or insects.

OMICS approaches for the characterization of elicitor-induced resistance of grapevine leaves against downy mildew

POLYSACCHARIDE COMPOUNDS AND USE OF SAME FOR STIMULATING DEFENCE RESPONSES OF PLANTS AGAINST PATHOGENIC MICROORGANISMS

The present invention relates to novel oligogalacturonans having a degree of methylation of 0 and a degree of polymerisation of 1 to 10, and to use there of for stimulating defence responses of plants against pathogenic microorganisms.

Characterization of grapevine defense reactions and identification of elicitors : the endopolygalacturonase 1 from Botrytis cinerea, an avirulence function for a virulence factor.

The fight against grapevine pathogens is mainly carried out by pesticides, the continued use of which is harmful to the environment and the health of users and consumers. The main organizations in charge of viticulture set as a priority the research and use of alternatives to chemical control. However, the genetic improvement of the vine is prohibited in AOC vineyards to preserve the varietal typicity, partly responsible for the quality of the wines. In addition, research undertaken some fifteen years ago reveals that plants have their own immune defenses, which they activate on contact with the microorganisms they recognize via molecules called elicitors. In this context, the objective of …

The Sulfated Laminarin Triggers a Stress Transcriptome before Priming the SA- and ROS-Dependent Defenses during Grapevine's Induced Resistance against Plasmopara viticola

Grapevine (Vitis vinifera) is susceptible to many pathogens which cause significant losses to viticulture worldwide. Chemical control is available, but agro-ecological concerns have raised interest in alternative methods, especially in triggering plant immunity by elicitor treatments. The β-glucan laminarin (Lam) and its sulfated derivative (PS3) have been previously demonstrated to induce resistance in grapevine against downy mildew (Plasmopara viticola). However, if Lam elicits classical grapevine defenses such as oxidative burst, pathogenesis-related (PR)-proteins and phytoalexin production, PS3 triggered grapevine resistance via a poorly understood priming phenomenon. The aim of this st…

USE OF 4-PHENYLBUTYRIC ACID AND/OR 3-PHENYLBUTYRIC ACID AND/OR 2-PHENYLBUTYRIC ACID IN PREVENTING AND TREATING CRYPTOGAMIC DISEASES

The present invention relates to the use of 2-phenylbutyric acid or 3-phenylbutyric acid or 4-phenylbutyric acid, or a salt thereof, or a combination thereof, to combat cryptogamic diseases which are caused by fungi or oomycetes. The present invention also relates to the use of these compounds and these combinations as fungicidal or fungistatic agents in preventing or curing cryptogamic diseases.

Development of a chitosan-based biocontrol product against crop diseases

Étude de la signalisation liée au stress du réticulum endoplasmique dans l’immunité de la vigne associée aux récepteurs kinases à motifs LysM (VvLYKs)

Dans le contexte de réduction des produits phytosanitaires en agriculture, l’amélioration desconnaissances sur l’immunité et la symbiose des plantes est un enjeu important dans larecherche de nouveaux modes de protection des cultures. Ce projet de thèse vise à améliorernos connaissances sur le rôle des récepteurs kinases à domaine LysM (LYKs) dans la balanceentre immunité et symbiose chez la vigne ainsi qu’à déterminer le rôle de la réponse au stressdu réticulum endoplasmique (Unfolded Protein Response; UPR) dans ces voies. Des travauxantérieurs ont identifié 15 récepteurs VvLYKs chez la vigne et permis de caractériser le rôle deVvLYK1-1 et VvLYK1-2 dans la perception de la chitine. Dans ce…