空心莲子草浸提液对5种蔬菜种子萌发的影响

Effects of Aqueous Extracts from Alternanthera philoxeroides Griseb on Seed Germination of Five Vegetable Seeds

[目的]了解空心莲子草的化感作用机理,为空心莲子草的防控和管理提供理论依据。[方法]研究了空心莲子草浸提液对5种常见蔬菜种子萌发的影响。[结果]空心莲子草浸提液处理仅对五月慢和意大利生菜种子的萌发率具有显著影响,而对其他3种种子的萌发率无显著影响;无论地上或地下浸提液处理萌发率由高到低依次为一点红萝卜、五月慢、一点红苋菜、意大利生菜和萝卜芽菜。浸提液处理对5种蔬菜种子幼苗芽长和根长的影响具有明显的种间差异。[结论]总的来说,空心莲子草的化感作用表现为抑制作用,但地上和地下浸提液的化感效应方式和强度在不同物种间及指标间存在较大差异。在空心莲子草侵染严重的地区,在针对该5种蔬菜种子的选择时,以选择一点红萝卜为宜。

[Objective] The allelopathy mechanism of A. philoxeroides was understood to provide theoretical basis for control and management of A. philoxeroides. [Method]Effects of aqueous extracts from A. philoxeroides on seed germination of five vegetable seeds were studied. [Result] The aqueous extracts had no effects on the seed germination of Luoboyacai,Yidianhongxiancai and Yidianhongluobo,but had significant effects on those of Wuyueman and Yidalilshengcai; meanwhile,no matter aboveground or underground aqueous extracts from A. philoxeroides,the germination rates of five vegetable seeds in sequence from high to low were Yidianhongluobo,Wuyueman,Yidianhongxiancai,Yidalishengcai and Luoboyacai. Besides,the allelopathy effects of A. philoxeroides on the bud length and root length of five vegetable seeds had significant interspecific differences. [Conclusion] The allolepathy of A. philoxeroides was negative,but there were vastly differences between species and parameters about the affecting style and extent of aboveground and underground leaching solutions. Therefore,at the areas where the invasion of A. philoxeroides is extensive and so is difficult to be wiped off,Yidianhongluobo is the better selection compared to other seeds.