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Abscisic Acid and Stomatal Closure Essay Preview: Abscisic Acid and Stomatal Closure Report this essay Abscisic Acid and Stomatal Closure Abscisic acid is a single compound unlike the auxins, gibberellins, and cytokinins. It was called “abscisin II” originally because it was thought to play a major role in abscission of fruits. Though ABA generally is.