Drought is a major factor that limit the distribution of plants and the production of crops. Drought stress induces a range of physiological and bio-chemical responses in plants, also in molecular level. Drought tolerent is a quatative trait (QTL), an assortment of genes involved in this process. These genes can be classified into two groups according to signaling pathway: ABA-independent and ABA-dependent regulatory systems. Here, we examined two genes involved in ABA-dependent pathway: 9-cis-epoxycaroteno...