紫茎泽兰对10种植物的化感作用研究

Study on the Allelopathy of Eupatorium adenophorum Spreng. on Ten Species of Plants

[目的]研究紫茎泽兰(Eupatorium adenophorum Spreng.)叶水浸提液对植物发芽率和幼苗生长的影响,为进一步探讨入侵植物紫茎泽兰的化感作用机制奠定基础。[方法]用蒸馏水浸提紫茎泽兰叶片化感物质,以5种十字花科植物种子和5种禾本科植物种子为供试材料,利用培养皿滤纸法研究不同浓度紫茎泽兰叶水浸提液对种子萌发和幼苗生长的影响。[结果]紫茎泽兰叶水浸提液对受试的不同品种植物的发芽率和幼苗生长均有不同程度的影响。其中,萝卜、芥菜、小麦、高粱对紫茎泽兰的化感作用较敏感;玉米最不敏感。[结论]紫茎泽兰叶水浸提液的化感作用是客观存在的,但对不同物种的影响存在较大差异,该研究在一定程度上可为探讨紫茎泽兰化感作用与其入侵性的关系提供参考依据。

[Objective] The aim of this study was to determine the effect of aqueous leaf extract from E.adenophorum Spreng.on seed germination and seedling growth of plants and lay the foundation for further exploration of the allelopathy mechanism of E.adenophorum.[Method] Taking 5 species of Brassicaceae plant seeds and 5 species of Gramineae plant seeds as test materials,allelochemicals were extracted from the leaves of E.adenophorum with distilled water.The effects of different concentration aqueous leaf extract from the leaves of E.adenophorum on the seed germination and seedlings growth of ten species were studied by using culture dish filter paper method.[Result] The aqueous leaf extracts from E.adenophorum had different influences on the germination rate and seedling growth of different tested plants to different extent.Among them,the allelopathy of Raphanus sativus L.,Brassica juncea,Triticum aestivum Linn.and Sorghum vulgare Pers were more sensitive.And Zea mays L.was the most insensitive.[Conclusion] The allelopathy of aqueous leaf extracts from E.adenophorum was confirmed and its effects on different species had greater difference.The research by using bioassay method could provide reference basis for investigating the relationship between allelopathy and invasiveness of E.adenophorum.