研究了在不同起始时间喷施不同浓度赤霉素(Gibberellin,GA)溶液对抑制芒果品种凯特(MangiferaindicaL.cv.Keitt)成花和推迟开花的影响.结果表明,在花芽分化期前喷高浓度赤霉素溶液能促使凯特芒果成花率降低,且成花率随喷施赤霉素起始时间的提前而逐渐降低,以2009年11月2日喷施GA3250、200 mg/kg的成花率最低,分别是17.95%、3.69%；在花芽分化期前喷赤霉素溶液能有效推迟凯特芒果的花期,但会降低成花率、结果枝率和穗果数,缩短花期,在2009年11月2日喷施GA3 25 mg/kg溶液推迟凯特芒果开花的效果较佳,与对照相比,始花期推迟15.53 d,盛花期推迟17.04d,末花期推迟15.64d,成花率、结果枝率、穗果数与对照相比差异不显著.%The effects of different gibberellin concentration with different spraying starting time on flowering times and delayed flowering of the Mangifera indie a L. Cv. Keitt were studied. The results showed that spraying high concentration of gibberellin before flower bud differentiation could make the flowering rate decrease, and the flowering rate gradually decreased with the spraying starting time being brought forward. The flowering rates were 17.95% and 3.69 % respectively for the treatments of spraying GA3 250 mg/kg and 200 mg/kg in November 2, 2009; Spraying gibberellin before flower bud differentiation could effectively delay flowering and reduce the flowering rate, fruit bearing branch rate, bunchy fruit rate and flowering stage. The flowering characteristics were delayed better for the treatment of spraying GA3 25 mg/kg in November 2, 2009. Compared with the control, the early blooming date, the full blooming date and the final flowering date were delayed 15.53 days, 17.04 days and 15.64 days respectively.
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