摘要
以热带地区常见植物萝卜、绿豆、黄瓜、柱花草和苋菜为受体植物,测定小飞蓬的水浸液对受体植物的种子萌发和幼苗生长的化感作用。结果表明,小飞蓬水浸液显著抑制5种受体植物种子的萌发,如0.20 g/mL小飞蓬茎叶水浸液对苋菜种子的萌发率和萌发指数的RI值分别为-0.822和-0.892。小飞蓬水浸液对萝卜、柱花草以及苋菜3种受体植物幼苗的生长表现出抑制作用。当根部水浸液的浓度为0.15 g/mL时,这3种受体植物幼苗的根都受到了极显著的抑制,其RI值分别为-0.399、-0.622和-0.667。综合各项指标分析,小飞蓬水浸液对不同受体植物之间的化感作用强弱差异显著,其中苋菜受到的化感作用最强,柱花草次之。小飞蓬水浸液中的化感物质大部分能溶于乙酸乙酯中。
Take Raphanus sativus,Vigna radata,Cucumis sativus,Stylosanthes guianensias and Acalypha hainanensis which were common plants in the tropical area as acceptor plants,allelopathic effects of the aqueous extracts from Conyza canadensis on the seed germination and seedling of the acceptor plants were determined.The test results showed that the aqueous extracts from Conyza canadensis obviously suppressed the germination of the 5 kinds of acceptor plant＇s seeds,for instance,the RI value of 0.20 g/mL aqueous extracts from Conyza canadensis stem leaf on the germination rate and germination index of A.hainanensis seeds were-0.822 and-0.892 respectively.The aqueous extracts from Conyza canadensis showed inhibitory effect on R.sativus,S.guianensias and A.hainanensis seedling growth.When the concentration of the aqueous extracts of root was 0.15 g/mL,the seedling＇s root of these 3 acceptor plant was extremely suppressed,their RI value was-0.399,-0.622 and-0.667 respectively.According to synthetic analysis,the allelopathic effects of aqueous extracts from Conyza canadensis to different acceptor plants were reamarkably different,the allelopathic effects on A.hainanensis was the strongest;while the next best was S.guianensias.The majority of the allelochemicals in aqueous extracts from Conyza canadensis could dissolve in ethyl acetate.
出处
《湖北农业科学》
北大核心
2011年第11期2254-2258,共5页
Hubei Agricultural Sciences
基金
农业部热带农林有害生物入侵监测与控制重点开放实验室开放课题(MACKL0908)
海南大学热带作物种质资源保护与开发利用教育部重点实验室资助项目
海南省自然科学基金项目(309017)
关键词
小飞蓬
化感作用
综合效应
Conyza canadensis
allelopathy
synthesis effects
