Abstract
Dormant buds and young developing shoots from grapevines sprayed with ethephon in the fall to hasten defoliation were analyzed for gibberellin-like substances and free and bound abscisic acid (ABA). The treatments which resulted in delayed budbreak had no effect on free gibberellic acid (GA) level but enhanced ABA and bound-GA syntheses. The presence of ABA in bud extracts, which depressed α-amylase activity in the barley endosperm bioassay, was confirmed by gas chromatography.
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