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A plant hormone, C15H20O4, that regulates the abscission of leaves, flowers, and fruits, the dormancy of buds and seeds, and other developmental processes and stress responses.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
Abscisic AcidA lipid hormone of plant origin which is involved in cell signalling. It inhibits plant cell growth and is associated with fruit drop, leaf death and seed dormancy, and helps plants respond to water loss and seasonal changes. Its effects can be reversed with gibberellins. It is synthesised in plastids from carotenoids.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
abscisic acida plant growth substance. It is called abscisin when found in ageing leaves and it is partly responsible for leaf ABSCISSION. It is also called DORMIN when in buds and seeds, and causes induction of dormancy. See Fig. 3 .
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005