外源激素对比利时杜鹃扦插根系特征的影响  

Effects of plant exogenous hormones on rooting characteristics of Rhododendron hybridum

作　　者：李丹丹[1,2] 李晓花 单文[1] 王兆红 王凯红[1] 张乐华[1,2] LI Dandan;LI Xiaohua;SHAN Wen;WANG Zhaohong;WANG Kaihong;ZHANG Lehua(Lushan Botanical Garden,Jiangxi Province and Chinese Academy of Sciences,Lushan 332900,China;Provincial Key Laboratory of Plant Ex Situ Conservation and Utilization,Jiujiang 332015,China)

机构地区：[1]中国科学院庐山植物园,江西庐山332900 [2]江西省植物迁地保护与利用重点实验室,江西九江332015

出　　处：《生态科学》2021年第2期82-88,共7页Ecological Science

基　　金：国家国际科技合作项目(2014DFA31720);“赣鄱英才555工程”领军人才培养计划项目。

摘　　要：比利时杜鹃是国外引种的具有较高观赏价值的园艺杂交品种。为进一步探讨外源激素对国外引进杜鹃品种扦插根系特征的影响,以当年生的半木质化枝条为材料,设置不同浓度植物生长调节剂,分析对杜鹃扦插生根过程中根系特征参数变化影响。结果表明:激素处理总体上对杜鹃扦插成活率、干物质积累、根系特征都有显著或极显著的影响,以100 mg·L^(-1)和200 mg·L^(-1)的IBA浓度对杜鹃插穗生长最有利;品种Marcel Menard、Marie Fortier根系特征参数整体上高于品种Roseum Elegance、Percy Wiseman,在产业化推广上具有一定优势;最长根长的变化与根表面积以及根体积呈显著的正相关,外源激素促进了插穗的成活率和不定根根系的生长,激素处理后插穗的根系参数明显高于对照。总之,插穗自身特性及外源激素调控在杜鹃扦插生根过程中扮演重要的角色,激素的使用对杜鹃的扦插繁殖具有一定的积极作用。Rhododendron hybridum is a kind of horticultural hybrid with high ornamental value introduced from abroad.In order to further explore the effect of exogenous hormones on the rooting characteristics of Rhododendron cuttings,the semi-wood cuttings of one-year-old were cut and treated by different concentrations of plant growth regulators to analyze the effect of exogenous hormones on the rooting process of Rhododendron cuttings.The results showed that the exogenous hormone treatment had a significant or extremely significant effects on the survival rate,dry matter accumulation and root characteristics of Rhododendron cuttings,higher than the control.It was the most favorable for the growth of cuttage of Rhododendron cultivars with the treatment of 100 mg·L^(-1) and 200 mg·L^(-1) IBA.The root characteristics of the Marcel Menard,Marie Fortier were higher than the Roseum Elegance and Percy Wiseman on the whole,which had a certain advantages in industrialization promotion.There was a significantly positive correlation between the longest root length,root surface area and root volume.Suitable exogenous IBA treatment had an obvious effect on accelerating the survival rate of cuttings and rooting.The root parameters of cuttings treated with hormone were significantly higher than those of the control.In short,the characteristics of cuttings and the regulation of exogenous hormones play an important role in the rooting process of Rhododendron,and the use of hormones has a certain positive effect in the cutting propagation of Rhododendrons.

关 键 词：外源激素 杜鹃花 扦插 根系特征 

分 类 号：Q945[生物学—植物学] S722[农业科学—林木遗传育种]