Exogenous gibberellic acid (GA₃) treatments applied to shoot apical meristematic tissue prior to or simultaneously with the start of short day photoinduction stimulated flower set of Humulus lupulus L. (hop) cultivar ‘Centennial’. Applications during the vegetative phase change resulted in the largest flower set promotion. GA₃ dosage and time of application relative to the start of the photoinductive period also influenced flower set stimulation. GA₃ applied post photoperiod induction resulted in less flowering promotion and more cell expansion. The results show, for the first time, a GA₃ flower stimulation relationship that encompasses tissue and bine development, rate-of-application, vegetative phase change, and photoinduction timing. This study provides a protocol for efficient application of GA₃ to enhance hop flower set, which may be relevant for future studies that reexamine exogenous GA₃ flowering control in commercial hop production.

外源赤霉酸 (GA _{3 ) 处理在短日光诱导刺激的}Humulus lupulus L. (hop) 栽培品种'Centennial' 的花组开始之前或同时用于拍摄顶端分生组织 。在营养阶段变化期间的应用导致最大的花组推广。GA ₃的剂量和相对于光诱导期开始的施用时间也影响开花刺激。GA ₃应用后光周期诱导导致较少的开花促进和更多的细胞扩增。结果首次显示，GA ₃花刺激关系包括组织和茎的发育、施用率、营养阶段变化和光诱导时间。本研究提供了有效应用 GA ₃ 以增强酒花花组的方案，这可能与未来重新检查商业酒花生产中外源 GA ₃开花控制的研究相关。