Effects of Mikania micrantha extracts and their exposure time on seed vigour, seed germination and seedling growth of plants

摘要

We studied the allelopathic effects ofMikania micrantha on seed vigour, seed germination and seedling growth of three receptor species (Robinia pseudoacacia L., Lolium perenne L. and Lagerstroemia indica L.) under different exposure times. The targetspecies were selected from the Mikania-invaded ecosystem in South China. The inhibitory effects on seed vigour, seed germination and seedling growth of these test species increased with increasing exposure times and at higher extract concentrations. Seedvigour was more sensitive to extracts of Mikania than seed germination and seedling growth. Robinia pseudoacacia was more resistant to Mikania extract than Lolium perenne and Lagerstroemia indica. We found that even short exposure time (50-100 h) to Mikania extract had strong allelopathic effects on seed vigour, seed germination and seedling growth of test species.