Résumé
The domain of Vieux Télégraphe, a historic AOP Châteauneuf-du-Pape estate, islocated in the Côtes-du-Rhône. It’s a family estate that exist for six generations. At thedomain, alcoholic fermentations are always carried out with native yeasts, in order to respectthe Brunier family philosophy. Indeed, they attach a lot of value to the respect of theenvironment and the product. For that, they try to limit their inputs as much as possible. Theirgoal is to conduct the fermentations with the least possible intervention. For this reason, thedomain decided to study the microbial biodiversity allowing the elaboration of the "VieuxTélégraphe" white wine.We counted the population of total yeast, non-Saccharomyces yeasts, lactic and aceticbacterias from the grape to the end of fermentation. We also identified the different non-Saccharomyces yeasts present in the must. This study showed a significant concentration ofSaccharomyces yeasts as well as non-Saccharomyces. In addition, many non-Saccharomycesyeasts were identified. We hypothesized their impact on alcoholic fermentation using theliterature. However, our study doesn’t allow a scientific interpretation. It would be necessaryto carry out another experiment based on the observations we made in order to fully solve theproblem.