Abstract: To effectively control the spread ofSolanum rostratum, this study used the principle of biological allelopathy to treat the seeds ofS. rostratumwith different concentrations of extracts from the aboveground and underground parts ofStellera chamaejasme, and corn seeds were used as the control to investigate effects ofS. chamaejasmeextracts on seed germination and embryo development ofS. rostratum. The allelopathic effect index and comprehensive allelopathic effect index were calculated by measuring germination rate, germination potential, germination index, radicle and hypocotyl length to evaluate the allelopathic effect ofS. chamaejasmeextract. The results showed that the inhibitory effect of the extract from the underground part ofS. chamaejasmeon seed germination and embryo development ofS. rostratumwas significantly stronger than that of the extract from the aboveground part. The inhibitory effect ofS. chamaejasmeextract onS. rostratumseeds was significantly greater than that of corn seeds. With the increase of extract concentration, the germination rate, germination potential and germination index ofS. rostratumand corn seeds showed downward trends, and the radicle length and germ length of corn seeds showed a trend of “low promotion and high inhibition”. While ensuring a small impact on corn seed germination, 40 g/L of underground part ofS. chamaejasmeextract was the optimal treatment mass concentration. At this mass concentration, the germination rate ofS. rostratumseeds was 0.08%, and the comprehensive allelopathic effect index was －0.78. The germination rate of corn seeds was 63.33%, and the comprehensive allelopathic effect index was －0.31.

Key words: Stellera chamaejasme, seed germination;Solanum rostratum;Zea mays, allelopathic effect