TY - JOUR T1 - Comparison between Responsiveness of Selected Grape Clones to Gibberellin Applications and Their Endogenous Levels in Breaking Buds and Maturing Berries JF - American Journal of Enology and Viticulture JO - Am J Enol Vitic. SP - 309 LP - 312 DO - 10.5344/ajev.1980.31.3.309 VL - 31 IS - 3 AU - Kenichi Hagiwara AU - Kay Ryugo AU - Harold P. Olmo Y1 - 1980/01/01 UR - http://www.ajevonline.org/content/31/3/309.abstract N2 - Rapidly growing shoot apices and flower clusters just past full bloom were treated with 40 ppm of gibberellic acid (GA) on Seeded Thompson and several seedless grape clones. Berries on some seedless selections were slightly stimulated to grow in comparison to the untreated control fruit while other hybrids responded to a large degree. These growth responses to GA were compared to the endogenous levels of free and bound gibberellins in the breaking buds, the elongating terminals beyond the treated zones, and maturing berries. No correlation was observed between the levels of these growth regulating substances and the responsiveness of the berries and shoots. ER -