Gibberellicacid(alsocalledGibberellinA3,GA,andGA3)isahormonefoundinplants.Whenpurified,itisawhite-to-pale-yellowsolid.Gibberellicacidisasimplegibberellin,promotinggrowthandelongationofcells.Itaffectsdecompositionofplantsandhelpsplantsgrowifusedinsmallamounts,buteventuallyplantsdeveloptoleranceforit.
GibberellicacidstimulatesthecellsofgerminatingseedstoproducemRNAmoleculesthatcodeforhydrolyticenzymes.Gibberellicacidisaverypotenthormonewhosenaturaloccurrenceinplantscontrolstheirdevelopment.SinceGAregulatesgrowth,applicationsofverylowconcentrationscanhaveaprofoundeffectwhiletoomuchwillhavetheoppositeeffect.Itisusuallyusedinconcentrationsbetween0.01-5mg/L.