Allelopathic effects of aqueous extracts of four plants on seed germination and seedling growth of Mikania micrantha
In order to prevent invasive Mikania micrantha from posing a serious threat to the ecological environment by allelopathy it was taken Wedelia trilobata,Bidens Pilosa,Ipomoea batatas('Guangshu'135)and Melastoma candidum as objectives,which were common plants in Guangdong,and explored the effects of aqueous extracts of roots,stems and leaves of the four plants on seed germination and seedling growth of M.micrantha.The results showed that the tissue aqueous extracts of the four tested plants mostly had obvious inhibitory effects on seed germination rate,germination index,vitality index and seedling root length of M.micrantha,while the inhibition effects became stronger with the increase of the extract concentration:the seed generation rate and the seed generation index under the treatment of 0.20 g·mL-1B.Pilosa leaf extract,and the vitality index under the treatment of 0.20 g·mL-1M.candidum leaf extract were decreased by 69.8%,81.1%and 74.6%compared with the control,respectively.Microscopic observation results showed that stem and leaf extracts had more toxic effects on root tip structure of M.micrantha seedlings than root extracts.The allelopathic effects of plant tissue extracts on M.micrantha were as a sequence of W.trilobata＞B.pilosa＞I.batatas＞M.candidum.
Mikania micranthaecological prevention and controlallelopathic effect
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