TY - JOUR T1 - Effect of 2-Chloroethylphosphonic Acid (Ethephon) on the Endogenous Levels of Gibberellin-Like Substances and Abscisic Acid in Buds and Developing Shoots of Three Grape Varieties JF - American Journal of Enology and Viticulture JO - Am J Enol Vitic. SP - 164 LP - 167 DO - 10.5344/ajev.1982.33.3.164 VL - 33 IS - 3 AU - Franco Mannini AU - Kay Ryugo Y1 - 1982/01/01 UR - http://www.ajevonline.org/content/33/3/164.abstract N2 - 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. ER -