“…Therefore, in plants that are routinely grafted, such as grapevine (Vitis vinifera L.), rootstock effect on scion performance must be considered in the study of adaptability to stress conditions. Rootstocks provide tolerance to exogenous limiting factors, biotic (e.g., soilborne pests) and abiotic (e.g., salinity, water or oxygen deficit), while influencing the ecophysiological behaviour of the scion and its berry quality (Bavaresco and Lovisolo, 2000;Padgett-Johnson et al, 2000;Soar et al, 2006;Tramontini et al, 2012;de Souza et al, 2009;Ibacache and Sierra, 2009;Rizk-Alla et al, 2011;Marguerit et al, 2012). Stomata are considered direct responsible of optimizing the balance between carbon gain and water loss of the plant (Rogiers et al, 2012), and the patterns of their response, in terms of timing and intensity, are genetically determined (Chaves et al, 2010).…”