Despite the agronomic and economic relevance of tomato, thiskind of information is lacking, therefore the mechanisms that driveresponses to water deficits in tomato have not been well character-ized yet, and only a very small number of genes that play a role indrought tolerance have been identified (Atarés et al., 2011; Pinedaet al., 2010). Tomato is particularly sensitive to a number of envi-ronmental stresses, especially extreme temperature, drought andsalinity (Kaloo, 1993).