摘要
In wine production, the typical characteristics of variety, defined by its place of their origin, contribute to the development of distinctive and unique wines. In the current study, we analyzed the effect of the environment using vine response and grape composition as indicators. Four cv. Tannat vineyards in three different climatic regions of Uruguay with similar soil conditions were studied in 2008 and 2009. Vines grafted onto SO4 （Vitis berlandieri × Vitis riparia） rootstock and were trained on a trellis system. Weather information was obtained from weather stations （MMO standards）. At each vineyard, we recorded： yield per plant, pruning weight, leaf area and pre-dawn leaf water potential. We analyzed sugars, total acidity and pH, polyphenolic potential, organic acids and berry weight. Analysis of variance, Pearson correlations and discriminant analysis were carried out. The climate factors with the highest discriminant weight were water balance, degree days （〉 10 ℃） of maturation and rainfall during the vegetative growth period. Plant response allowed us to discriminate between vineyards regardless of the year and was consistent with climate. Exposed leaf area and length of maturation period were the indexes with the highest values, followed by leaf water potential and grape yield. The total anthocyanin content, sugar contents and their daily accumulation, and acid composition statistically separate regions regardless of the year. We concluded that plant response and grape composition were strongly influenced by water supply and thermal conditions during ripening.
