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BOdEGA : Interactions of BOtryosphaeriaceae between forEst and Grapevine Agrosystems

Résumé du projet

Botryosphaeriaceae fungi are an emerging group of pathogens of both grapevines and forest trees. Most of the Botryosphaeriaceae species are endophytes but can cause symptoms especially in specific host-stress conditions. Climate change has been already shown to be favourable for these pathogens. In addition to the difficulties commonly faced to control pathogens presenting such opportunistic behaviour, the knowledge on species composition and spatial distribution of this group is still sparse. Recent observations further suggest that common Botryosphaeriaceae species are found both in vineyards and in forests.

Therefore, several important questions require our attention :

• what is the level of Botryosphaeriaceae species diversity affecting these two agroecosystems?
• Is the species composition of both compartments connected or showing evidence of host-specialisation?

These interrogations have motivated the BOdEGA project (projet Labex COTE 2017-2019) which

• 1) aims to clarify the composition of Botryosphaeriaceae communities in vineyards and forests,
• 2) investigates the population origin and genetic structure of frequently identified species (i.e. key species) and
• 3) explores the level of host-specialisation developed by key species, in interaction with host water-stress.

This approach has been initiated locally, since Botryosphaeriaceae fungi have been intensively reported in South-West of France and will benefit from already built networks. Eventually, the knowledge produced during this project will have important fundamental outcomes, especially for host-pathogen evolution and specialisation, and in applied outcomes like the development of more integrative solutions for epidemics management.