abscisic acid

A Dictionary of Plant Sciences

abscisic acid (abscisin II, dormin) A terpenoid (see TERPENE) compound that is one of the five major plant hormones. Although it is synthesized principally in the chloroplasts, it occurs throughout the plant body and is particularly concentrated in the leaves, fruits, and seeds. It has powerful growth-inhibiting properties generally and also promotes leaf abscission and the senescence of plants and/or their organs, and induces the closing of stomata and dormancy in seeds and buds. Its effect is antagonistic to the plant growth hormones, and is thought to act by inhibiting the synthesis of protein and nucleic acids.

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© A Dictionary of Plant Sciences 1998, originally published by Oxford University Press 1998.

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