红花绿绒蒿对油菜种子萌发及幼苗生长的化感效用研究

Allelopathic Effects of Meconopsis punicea Maxim.on Seed Germination and Seedling Growth of Rape

目的 探究红花绿绒蒿果壳及根际土对油菜种子的化感作用。方法 通过培养皿生物测定法,分析红花绿绒蒿果壳及根际土水浸液对油菜种子发芽率、发芽势、发芽指数及幼苗长、根长、幼苗单株重量的影响。结果 当红花绿绒蒿果壳水浸液浓度小于0.050 g/mL、根际土水浸液浓度小于0.250 g/mL时,综合化感效应指数为正值,表现为促进作用,当果壳水浸液浓度大于0.100 g/mL、根际土水浸液浓度大于0.500 g/mL时,综合化感效应指数为负值,表现为抑制作用,且抑制效果随着水浸液浓度的增大而增强。结论 红花绿绒蒿果壳及根际土水浸液对油菜种子萌发及幼苗生长具有低浓度促进、高浓度抑制的双重效应,且果壳水浸液化感作用强于根际土水浸液。

Objective To explore the allelopathic effects of the shell and rhizosphere soil of Meconopsis punicea on rape seeds.Methods Using petri dish bioassays,analyze water extracts from the shell and rhizosphere soil of Meconopsis punicea on the germination rate,germination potential,germination index,seedling length,root length,and individual plant weight of rape seeds.Results When the concentration of the water extract from the shell of Meconopsis punicea was less than 0.050 g/mL and the concentration of the water extract from the rhizosphere soil was less than 0.250 g/mL,the comprehensive allelopathic effect index was positive,indicating a promoting effect,the concentration of shell water extract was greater than 0.100 g/mL and the concentration of rhizosphere soil water extract was greater than 0.500 g/mL,the comprehensive allelopathic effect index was negative,indicating an inhibitory effect,and the inhibitory effect increases with the increase of water extract concentration.Conclusion The water extract from the shell and rhizosphere soil of Meconopsis punicea has a dual effect of low concentration promotion and high concentration inhibition on rape seeds,the liquefaction effect of the water extract from the shell of Meconopsis punicea is stronger than that of the water extract from the rhizosphere soil.