Allelopathic Effects of Aqueous Extracts from Five Kinds of Traditional Chinese Medicines on Germination of Portulaca oleracea and Setaria viridis

Yan Xuewen; Ma Xinle; Wang Dechang; Zhang Feng; Shan Chenggang; Song Zhenqiao

doi:10.14083/j.issn.1001-4942.2025.08.011

Abstract：In order to explore the allelopathic effect of aqueous extracts of traditional Chinese medicines on seed germination of two kinds of weeds(Portulaca oleracea and Setaria viridis)in field,the aqueous ex-tracts of five kinds of traditional Chinese medicines(Polygoni Cuspidati Rhizoma Et Radix,Sophorae Flaves-centis Radix,Artemisiae Argyi Folium,Rehmanniae Radix,Scutellariae Radix)at 100 and 200 g·L-1 were used to study their effects on seed germination and seedling growth of the two species of weeds,which was ex-pected to explore a new direction of"traditional Chinese medicines for weeding",and provide references for development of herbicides derived from traditional Chinese medicines and control of weeds.The results showed that the five kinds of aqueous extracts exhibited allelopathic inhibitory effects on germination of the two kinds of weeds,and most treatments reached a significant level with the inhibitory intensity showing S.viridis＞P.ol-eracea.In terms of seedling growth,the five kinds of aqueous extracts at 100 g·L-1 and 200 g·L-1 showed sig-nificant allelopathic inhibitory effects on root length of S.viridis and P.oleracea.The aqueous extract of Poly-goni Cuspidati Rhizoma Et Radix at 100 g·L-1 and 200 g·L-1 significantly promoted the seedling height of S.viridis and P.oleracea,while that of the other four kinds of traditional Chinese medicines showed varing effects on seedling height of the two kinds of weeds,which exhibited inhibitory effects in most cases but promoting effects in few cases.In sum,the response of seed germination and seedling growth of P.oleracea and S.viridis to the allelopathic effects of the five kinds of aqueous extracts were different.The comprehensive index of allel-opathic effects indicated that the aqueous extract of Scutellariae Radix had greater inhibitory effects on seed germination and seedling growth of the two kinds of weeds.