noun[mass noun] Biochemistry
A plant hormone which promotes leaf detachment, induces seed and bud dormancy, and inhibits germination.
- Of particular interest here is the amphipathic plant hormone abscisic acid.
- Subsequently, a signal transduction cascade involving at least four plant hormones, ethylene, auxin, abscisic acid, and gibberellic acid, is activated.
- When conditions are otherwise in favour of producing the submerged type morphology, an exogenous supply of the plant hormone abscisic acid at an optimal concentration induces aerial type characteristics.
1960s: abscisic from abscisin (the earlier name for the hormone), from abscission.
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