赤霉素(GA)A_4和A_7(混合剂)单独使用、A_5和A_9合用,对生长在沿海岸的黄杉属(花旗松)无性系4年生接穗开花有重要的促进作用。自三月底至六月底,每二周在枝上使用400μg GA4/7,经多次重复试验,使胚珠增长5倍,使雄球花序增长3倍。~6N-苄基腺嘌呤和2,3,5-三碘苯甲酸与GA Gibberellin (GA) A_4 and A_7 (mixture) were used alone, and A_5 and A_9 combined played an important role in promoting the flowering of 4-year-old scion of the Douglas fir (Douglas fir) clones along the coast. From late March to the end of June, 400 μg of GA4 / 7 was applied to the branches every two weeks. After repeated trials, the ovules were increased 5-fold and the male gametophyte increased 3-fold. ~ 6N-benzyladenine and 2,3,5-triiodobenzoic acid with GA