Study on allelopathic effects of Rabdosia serra extract on seed germination of Pennisetum alopecuroides
The experiment aimed to study the effects of Rabdosia serra extract on the Pennisetum alopecuroides seeds and the growth of seedlings.In the experiment,30 Pennisetum alopecuroides seeds were placed in a petri dish,and 0,5,10,20,40,80 g/L of Rabdosia serra extract were added respectively,with three replicates for each treatment,using distilled water as a control.The results showed that compared with the control,both the dry and fresh extract solutions of Rabdosia serra reduced the seed germination rate,germination potential,and chlorophyll content.When the concentration of the dry and fresh extract solutions was 80 g/L,the germination index of Pennisetum alopecuroides seeds decreased by 81.2%and 38.4%respectively,and the seed vigor index decreased by 88.9%and 41.5%respectively.The dry extract solution had a more pronounced inhibitory effect on seedling height,while the fresh extract solution had a more pronounced inhibitory effect on seedling root length.The allelopathic inhibitory intensity of the dry extract solution at concentrations of 10,20,80 g/L on perennial pennisetum seeds was higher than that of the fresh extract solution,with the 80 g/L dry extract solution showing the greatest allelopathic inhibitory intensity.The study indicates that both the dry and fresh extract solutions of Rabdosia serra have allelopathic effects on the germination and seedling growth of Pennisetum alopecuroides,with the dry extract solution having a stronger allelopathic inhibitory effect on the germination and seedling growth of Pennisetum alopecuroides than the fresh extract solution,and the inhibitory intensity is the greatest at a concentration of 80 g/L.
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