[Objective] To study the effects of different plant growth regulators on the growth of hybrid Cymbidium.[Method] The effects of different plant growth regulators and their concentrations on the growth of hybrid Cymbidium were studied by using two-year hybrid Cymbidium Red Beauty as material under foliar spraying and pseudobulb spraying.[Result] Compared with the control,100 mg/L GA3 and 150 mg/L GA3 + 150 mg/L 6-BA under foliar spraying promoted the flower bud differentiation at the early stage,but the flower buds failed to form at the later stage,while the other combinations and flower buds differentiation were inhibited.High concentrations of TDZ and 6-BA were not conducive to flower bud differentiation,especially 6-BA.However,when 6-BA was used in combination with GA3 at a suitable concentration,the inhibition of floral bud differentiation was weakened.Meanwhile,plant growth regulators could enhance the induction of axillary buds,the effect of GA3 on the length of pedicel can be effectively improved by the influence of pedicel length.When GA3 was combined with 6-BA,although the length of pedicel was increased,the number of flowering buds was serious at the later stage.In the case of pseudobulb spraying,low concentrations of 6-BA and 6-BA combined with low concentrations of GA3 promoted flower buds and axillary bud formation.[Conclusion]In the flower bud differentiation of two year old hybrid Cymbidium,it is better that pseudobulb should be sprayed with low concentrations of 6-BA;to promote the length of pedicel,it is appropriate to spray the leaf surface with low concentrations of GA3.%[目的]研究不同植物生长调节剂对杂交兰生长的影响.[方法]以两年生杂交兰“红美人”为材料,采用叶面喷施和假鳞茎喷施方式,研究不同植物生长调节剂和浓度对杂交兰生长的影响.[结果]采用叶面喷施方式,相比对照,100 mg/L GA3和150 mg/L GA3+150 mg/L6-BA在前期促进花芽分化,但后期花芽未能成形,其余组合和浓度对花芽分化均呈抑制作用.高浓度TDZ和6-BA不利于花芽分化,6-BA尤为明显,但当6-BA组合适宜浓度的GA3时,呈现花芽分化抑制作用减弱现象,同时,植物生长调节剂均能提高腋芽诱导,且高浓度或组合GA3的6-BA作用尤为明显,在花梗长度的影响上,GA3能够有效增加花梗长度,当GA3组合6-BA时,虽可增加花梗长度,但后期开花掉苞严重.以假鳞茎喷施时,低浓度的6-BA和6-BA组合低浓度的GA3能够促进花芽和腋芽的形成.[结论]在两年生杂交兰促进花芽分化上,应以低浓度的6-BA喷施假鳞茎为佳;在促进花梗长度上,应以低浓度的GA3喷施叶面为宜.
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