Résumé
This thesis presents my experience at the Domaine de Châtenoy. For five months, I had the opportunity to discover viticultural and oenological practices in the heart of the Centre-Val de Loire vineyard, more specifically in the Menetou-Salon appellation, under the supervision of Pierre-Alexandre Clément. The first part of this thesis is devoted to a detailed description of the activities carried out in the vineyard and cellar during the internship, in particular the winemaking practices specific to the estate. Sauvignon Blanc is the appellation's signature grape variety for white wines. It is highly appreciated for its complex, thiolated aromatic profile. The second part of this thesis aims to improve the complexity and quality of the estate's wines by experimenting with Sauvignon blanc massal selection. Different massal selections and a clonal selection were compared for their agronomic and oenological performance, with particular emphasis on the intense thiole profile characteristic of Sauvignon blanc. This character was therefore subjected to extensive laboratory analysis. Although the study did not lead to any significant conclusions between the massal selections, it did highlight the importance of the Clément massal selection in preserving the estate's genetic heritage. The regularity of clonal selection, particularly in the expression of thiol families, was also observed. In the end, the recommandation regarding selection is leaning towards a reasoned use of each one of them.