In order to study the allelopathic effects of extract from Rabdosia Serra(Maxim.)Hara on seed germi-nation and seedling growth of weeds,seed germination,seedling morphology and physiological indexes of two recep-tor materials,Echinochloa crusgalli L.and Digitaria sanguinalis L.were determined by Petri dish filter paper method in this experiment.The results showed that:(1)when the extract of fresh sample of R.Serra was 80 mg·mL-1,the seed germination and root length of E.crusgalli and D.sanguinalis were significantly inhibited(P＜0.05);(2)The activities of Peroxidase(POD)and Catalase(CAT)of E.crusgalli significantly increased with increasing concentrations of the extracts from the dried and fresh samples of R.Serra,while those of D.sanguina-lis significantly decreased(P＜0.05);(3)The synthetical allelopathic effects on D.sanguinalis were shown to be inhibitory at concentrations of 20,40 and 80 mg·mL-1 for both samples of R.Serra,and the inhibitory effects were stronger at higher concentrations.In conclusion,the extract of R.Serra at a concentration of 80 mg·mL-1 had significant inhibitory effect on seed germination and seedling growth of D.sanguinalis(P＜0.05).
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