• Abscisic Acid (ABA) – FAQs 2019-03-11 11:00:37 Abscisic acid (ABA), also known as abscicin II and dormin, is a plant hormone. ABA functions in many plant developmental processes, including bud dormancy and resistance to abiotic stresses. During drought, the plant hormone Abscisic acid (ABA) inhibits stomatal opening and promotes stomatal closure Abscisic Acid