Definition of abscisic acid in English:

abscisic acid

noun

Biochemistry
  • A plant hormone which promotes leaf detachment, induces seed and bud dormancy, and inhibits germination.

    • ‘Subsequently, a signal transduction cascade involving at least four plant hormones, ethylene, auxin, abscisic acid, and gibberellic acid, is activated.’
    • ‘Analysis of mutant plants suggests that the plant hormones abscisic acid, ethylene and jasmonates are implicated in the long-distance signalling pathway and that the action may be mediated by reactive oxygen species.’
    • ‘Of particular interest here is the amphipathic plant hormone abscisic acid.’
    • ‘The hormone abscisic acid induces a myriad of cellular responses in plants via complex signal transduction cascades, leading to tolerance towards various stresses, including cold, drought and salinity.’
    • ‘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.’

Origin

1960s: abscisic from abscisin (the earlier name for the hormone), from abscission.

Pronunciation

abscisic acid

/abˌsisik ˈasid/