mechanisms of grapevines developed under mild or moderate drought conditions. Conversely, cultivars with a different tolerance to drought have different responses to gibberellic acid based on our two-year investigation. GA3 has been in use for many years in table grape growing, but its influence on grapevines (wine grapes) is less known. Since GA3 can also provoke an opposite effect on the regulation of water balance and photosynthesis between the different cultivars, therefore only prudent use is recommended.