Résumé
Water is an important factor in the terroirs of grape-growing regions. The vine obtains water from rainfall and the water table and when it is in short supply, it is necessary either to irrigate oraccept the effects of water stress. Depending on the intensity of the water stress and the period at which it occurs, it may or not be favourable for the harvest and the wine it us used to produce. The objective of this article is to provide some information on the relationship that exists between the vine and water. We will present the leaf water potential techniques for measuring vine water status and its evolution during the vegetative cycle as a function of water reserves in the soil easy to use by the roots. Finally, examples are presented of possible recommendationsfor vine cultural practices as a function of the vine water status evolution during the growth, according to the predawn leaf water potential thresholds.The composition of the berry, notably in terms of sugars, titratable acidity (tartaric and malic acids) phenolic compounds (tannins; proanthocyanidols, flavonols, anthocyanins etc.) is strongly dependant on the water status of the vine associated with the microclimate of the grape bunches and the architecture of the vegetation