Abstract: To understand the effect of plant growth retardants on the growth of walnut branches and leaves and fruit quality,with 7-year-old Xinxin 2 walnut tree as the experimental material and water as the control,using 200,300,400,500 mg/L of DPC and 500,1 000,2 000,3 000 mg/L of PP₃₃₃,two inductions were carried out during the fruit swelling period and fruit core-hardening period.The length and thickness of walnut twigs and vegetative twigs and fruit quality were measured.And the blade dissect structure was observed.The effects of different growth retardants on the growth,leaf structure and fruit quality of walnut were analyzed.The results showed that the total length of fertile branch,the total thickness of fertile branch and the total length of foliage branch could be reduced by the application of DPC and PP333 ,but DPC had no significant effect on the total thickness of foliage branch. PP333 of 2 000 mg/L could reduce the palisade spongy and the palisade tissue/ mesophyll,and the tannin content was significantly lower than that of the control group. The comprehensive quality of walnut nuts was the best under the treatment of 200 mg/L DPC and 500 mg/L PP₃₃₃.The contents of soluble sugar and tannin in fruits treated with 200 mg/L DPC were increased by 5.3% and 18.2%,respectively,compared with the control group.The contents of soluble sugar and reducing sugar in walnut fruits were increased by 15.8% and 12.0% respectively under the treatment of 500 mg/L PP₃₃₃ compared with the control.The control tip of walnut fruit was the best when spraying DPC or PP₃₃₃ droplet at the expansion stage,and the comprehensive quality of walnut fruit was the best when spraying DPC or PP₃₃₃ droplet at the concentration of 200 mg/L or 500 mg/L,respectively,which could be used for the control tip of Xinxin2 tree.

Key words: Walnut, Xinxin2, DPC, PP₃₃₃, Growth, Quality

摘要： 为了解植物生长延缓剂对核桃枝叶生长及果实品质的影响，以7年生新新2号核桃树为试验材料，以清水为对照，利用200、300、400、500 mg/L的缩节胺（DPC）和500、1 000、2 000、3 000 mg/L的多效唑（PP₃₃₃）在核桃果实膨大期和硬核期进行2次诱导，测定核桃果枝和营养枝的长度及粗度、果实品质指标，观察叶片解刨结构，分析不同的生长延缓剂对核桃枝条生长、叶片组织结构和果实品质的影响。结果表明，与对照相比，施用缩节胺和多效唑基本上可降低核桃生育时期营养枝长度和粗度总增长量及果枝长度总增长量，缩节胺对果枝粗度无显著影响；2 000 mg/L多效唑可降低栅海比、栅栏组织/叶厚，且单宁含量显著低于对照。200 mg/L缩节胺与500 mg/L多效唑处理核桃果实综合品质表现最好。200 mg/L缩节胺处理果实可溶性糖含量和单宁含量分别比对照增加5.3%、18.2%；500 mg/L多效唑处理核桃果实可溶性糖和还原糖含量分别比对照增加15.8%、12.0%。在膨大期喷施缩节胺或多效唑的控梢效果最佳，且缩节胺和多效唑质量浓度分别为200、500 mg/L时核桃果实综合品质最优，可用于新新2号树体控梢。

关键词: 核桃, 新新2号, 缩节胺, 多效唑, 生长, 品质