Abscisic acid (ABA) is a plant hormone that plays an essential role in the regulation of plant growth, development, and stress responses. It is involved in the regulation of seed dormancy, leaf senescence, and the response to environmental stresses, such as drought and cold. Abscisic acid is synthesized in many plant organs, including the leaves, roots, and seeds. In response to environmental stimuli, ABA is rapidly transported from its site of synthesis to the site of action, where it binds to specific receptors, triggering a cascade of physiological responses. ABA also plays an important role in the regulation of gene expression and metabolism.
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