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Abscisic acid

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{ab-sis'-ik} Abscisic acid, or dormin, is a plant HORMONE that promotes abscission, the process responsible for the fall of leaves, flowers, and fruits. It is produced in response to such stimuli as the changing relative lengths of day and night during autumn. Abscisic acid also counters the growth-stimulating effects of the plant hormones known as AUXINS, GIBBERELLINS, and kinins (see CYTOKININ) and thus induces DORMANCY of buds and inhibits seed germination during winter.

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