The phytohormone abscisic acid (ABA) coordinates plant responses to stressors such as drought, extreme temperature and high salinity, as well regulates non-stress responses including seed formation and maturation, seed and bud dormancy, root growth, leaf senescence, and transition between vegetative and reproductive growth. ABA, similarly like the others plant hormones, functions through a complex network of signaling pathway, where ABA signal perception by ABA receptors is the primary event that triggers downstream signaling cascades to induce the final physiological responses.