Evolution of Abscisic Acid Signaling MechanismsAbstractThe plant hormone abscisic acid (ABA) mediates seed dormancy, controls seedling developmentand triggers tolerance to abiotic stresses, including drought. Core ABA signaling componentsconsist of a recently identified group of ABA receptor proteins of the PYRABACTINRESISTANCE (PYR)/REGULATORY COMPONENT OF ABA RECEPTOR (RCAR) familythat act as negative regulators of members of the PROTEIN PHOSPHATASE 2C (PP2C) family.Inhibition of
