【作者】 段晓婧； 徐则行； 杨杨； 马履一； 冷平生；

【Author】 DUAN Xiao-jing;XU Ze-hang;YANG Yang;MA Lv-Yi;LENG Ping-sheng;Beijing University of Agriculture;Ministry of Education Key Laboratory for Silviculture and Conservation,Beijing Forestry University;Forestry Bureau of Chaoyang,Liaoning Province,Project Office;

【机构】 北京农学院园林学院； 北京林业大学教育部森林培育与保护重点实验室； 辽宁省朝阳市林业局项目办；

【摘要】 探究秋季根施乙烯利和多效唑对红花玉兰苗木质量和枝条抗性的影响,为这一珍稀新种在北方地区的引种栽培提供技术参考。以盆栽红花玉兰为材料,秋季每半月灌根施入100、300、500、750、1000和1500mg·L^-1的乙烯利和25、50、75、100、150和200mg·L^-1的多效唑。秋末,测定苗木质量指标和枝条抗性指标,并运用隶属函数对红花玉兰的抗寒能力作综合评价。750mg·L^-1乙烯利处理不仅显著提高了苗木质量指数,而且最大程度增强了根系活力并降低了枝条电导率,同时还能有效促进枝条中脯氨酸、可溶性蛋白和可溶性糖的积累以及SOD和POD活性的提升;75mg·L^-1多效唑处理既能最大程度提高苗木质量指数,又能有效增强根系活力并降低枝条电导率,同时在促进枝条中脯氨酸和可溶性糖的积累以及SOD和POD活性的提升上也作用显著。此外,隶属函数的分析结果也显示,750mg·L^-1乙烯利和75mg·L^-1多效唑对抗寒能力的增强作用最大。综合考量两种调节剂的正面和负面效应,我们建议在红花玉兰的北引栽培实践中采取秋季根施750mg·L^-1乙烯利的措施。更多还原

【Abstract】 To investigate the effects of late-season ethephon and paclobutrazol root application on seedling quality and shoots ’ cold tolerance of Magnolia wufengensis,which could pave the way to introduce and cultivate the new rare species.Pot M.wufengensis seedlings cultured under the same outdoor conditions were poured with ethephon(100,300,500,750,1000 and1500 mg · L^-1) and paclobutrazol(25,50,75,100,150 and 200 mg · L^-1) separately,bimonthly.In Nov.,samples were collected,related indexes were measured and conducted comprehensive evaluation of cold tolerance.750 mg · L^-1 ethephon not only enhance QI、RV and RC at the greatest extent,but could increase PC,SPC,SSC,POD and SOD.75 mg · L^-1paclobuazol could improve QI、RV,effectively decrease RC,at the same time,increase the contents of proline,soluble sugar,POD and SOD.Besides,according to result of comprehensive evaluation,750 mg · L^-1 ethephon and 75 mg · L^-1 paclobutrazol in enhancing cold tolerance of M.wufengensis were top 2.Taking the effects of ethephon and paclobutrazol on seedling cold tolerance of M.wufengensis and soil into consideration,we suggest 750 mg · L^-1 ethephon may be used on M.wufengensis grown in northern China.更多还原