迷人杜鹃凋落叶水浸提液对其自身种子萌发的影响  

Effects of Rhododendron agastum Litter on Its Seed Germination

作　　者：周艳[1,2] 韦小丽[1] 陈训[1,3] 

机构地区：[1]贵州大学林学院,贵阳550025 [2]贵州省植物园,贵阳550004 [3]贵州科学院,贵阳550001

出　　处：《种子》2015年第3期8-11,共4页Seed

基　　金：贵州省科技厅项目(编号:SY字[2012]3032);贵州省林业厅项目(编号:2009-7)

摘　　要：为明确迷人杜鹃凋落叶是否具有化感作用,采用培养皿法,研究了不同浓度迷人杜鹃水浸提液对其种子萌发、幼苗生长和生理生化指标的影响。结果表明:浸提液对迷人杜鹃种子发芽和幼苗生长的化感作用表现出"低促高抑"的浓度效应。在浓度为1 mg/m L时,促进了种子萌发、胚芽和胚轴长度的伸长,分别比对照增加了2.67%、17.71%和8.64%。在浓度为50 mg/m L时,发芽率降低77.88%,胚芽和胚轴长度降幅为65.82%、78.37%,抑制了植株生长。用浸提液浸种,在浓度为1 mg/m L时幼苗的根系活力和叶绿素含量提高,随着处理液浓度的提升,幼苗的根系活力和叶绿素含量降低,均可视为防碍生长的生理原因。In order to ascertain the allelopathy and allelochemicals in litter of R. agastum,the allelopathic effects of litter aqueous extract on the seed germination,seedling growth and physiological indexes of R. agastum were studied by the way of indoor petri dish bioassay,by which produced a different treatment gradient. The results indicated that the allelopathic effects on seed germination and seedling growth varied with aqueous concentrations. The lowest aqueous at the concentration of 1 mg/m L promoted the seed germination,shoot and root elongation,which were increased 2. 67%,17. 71%,8. 64%. The highest aqueous at the concentration of 50 mg/m L led to the strong allelopathic effects,the germination rate,shoot and root length were decreased by 77. 88%,65. 82% and 78. 37%. In addition,at the concentration of 1 mg/m L,root activities and chlorophyll of seedling were increased,with the ascension of queous concentrations both the root activities and chlorophyll of seedling were reduced,these phenomena could be considered as a physiological reason for growth retards.

关 键 词：迷人杜鹃 凋落叶 化感作用 种子萌发 

分 类 号：S685.21[农业科学—观赏园艺]