加拿大蓬水提液对甜白菜和油菜幼苗化感作用

Effect of Allelopathy of Conyza canadensis L. Water Extract on Seedling Growth of Sweet Cabbage and Brassica chinensis L.

以加拿大蓬(Conyza Canadensis L.)为供体植物,甜白菜(Sweet Cabbage)和油菜(Brassica Chinensis L.)种子为受体,采用培养皿滤纸法,测定加拿大蓬的茎叶水提液对甜白菜和油菜幼苗的根长、苗高和鲜质量的化感作用。研究结果表明,加拿大蓬地上部分的水提液对甜白菜和油菜幼苗植株生长有明显的化感作用,且不同浓度水提液对不同作物的影响存在差异;对二者根系生长均有明显的抑制作用,且随着浓度的增大抑制作用增强;当浓度为0.25 g/mL,0.50 g/mL和1.00 g/mL时,甜白菜幼苗的根长分别比对照减少69.3%,95.1%和100.0%,油菜幼苗的根长分别比对照减少69%,93.7%和100%;对株高表现为"低促高抑"的趋势。

The allelopathic potentials of aqueous extracts of Conyza canadensis L.were investigated to determine the role of allelopathic potentials of vegetable.In this study,with C.canadensis L.as Allelochemicals donor plants,sweet cabbage and Brassica chinensis L.seeds as the receptors,respectively,the filter paper method of petri dishes was used to examine how water extract of plant aerial parts affect the root length,seedling height,and fresh weight of sweet cabbage and B.chinensis L..The result showed that water extract of aerial parts of C.canadensis L.had obvious allelopathic effect on seedling growth of sweet cabbage and B.chinensis L.,and different concentrations of aqueous extracts made different effects.The inhibition of aqueous extracts to root growth was observed,which become stronger with the concentration of aqueous extracts going up.The concentrations of 0.25,0.50,1.00 g/mL,compared to the control,root length of sweet cabbage decreased by 69.3%,95.1% and 100.0%,respectively;and these of B.chinensis L.decreased by 69.0%,93.7% and 100.0%,respectively.For seedling height the effect of aqueous extracts of C.canadensis L.beneficial under lower concentration and inhibitory under higher concentration.