PT - JOURNAL ARTICLE AU - Kenichi Hagiwara AU - Kay Ryugo AU - Harold P. Olmo TI - Comparison between Responsiveness of Selected Grape Clones to Gibberellin Applications and Their Endogenous Levels in Breaking Buds and Maturing Berries AID - 10.5344/ajev.1980.31.3.309 DP - 1980 Jan 01 TA - American Journal of Enology and Viticulture PG - 309--312 VI - 31 IP - 3 4099 - http://www.ajevonline.org/content/31/3/309.short 4100 - http://www.ajevonline.org/content/31/3/309.full SO - Am J Enol Vitic.1980 Jan 01; 31 AB - 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.