[Objective] The dynamic change of hormone content in the leaf of mulberry varietyXuan 792 was studied when it was treated with plant growth regulator in its cutting in summer. [Method] The effect of the plant growth regulator on the content of GA_3, Z+ZR, IAA and ABA in leaf of mulberry varietyXuan 792 was researched based on three treatments of DPC of 200 mg/L, Tianfengsu of 200 mg/L and water. [Results] The content of GA_3 and Z+ZR, and the ratio of IAA/ABA in the leaf were reduced to varying degree in the treatment of 200 mg/L of Tianfengsu during the first 3rd to 10th day; in the middle period, they were raised. The treatment of DPC inhibited the increment of GA_3 in early period, but the content of GA_3 in leaf was rapidly raised from the 3rd to 10th, and meanwhile, the ratio of IAA/ABA was significantly decreased compared with others, but the content of Z+ZR was no significant difference. [Conclusion] The response of same mulberry variety to plant growth regulators was different under the environmental conditions of temperature, growth season, tree growth period.%[目的]研究植物生长调节剂对选792桑树品种在夏伐时进行处理,其叶片中激素含量的变化动态.[方法]设缩节胺200 mg/L、天丰素200 mg/L、清水3个处理,研究植物生长调节剂对选792桑树品种叶片中GA_3、Z+ZR、IAA、ABA含量变化及影响.[结果]200 mg/L天丰素在处理初期,即第3～10天,不同程度地降低了叶片中GA_3、Z+ZR、IAA/ABA的比值及含量,在处理的中后期,该处理使得叶片中Z+ZR、IAA/ABA的比值及含量均有所升高;200 mg/L缩节胺在处理初期,抑制了叶片中GA_3的含量,但第3～10天使得GA_3含量又迅速升高,同时IAA/ABA的比值也明显较其他处理有所下降,而Z+ZR含量则无明显差异.[结论]不同温度、季节、桑树生长时期等环境条件,相同桑树品种对植物生长调节剂的反应不同.
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