Title: Allelopathic effects of aqueous extracts from Ligularia sagitta on seed of nine pasture plants
Abstract: Ligularia sagitta,a noxious weed,distributes widely in psychro-grassland in the east of Qinghai-Tibet plateau of China.The allelopathy of aqueous extracts from roots and leaves of the noxious weed to 9 pasture plants(including 7 species of sympatry and 2 species of allopatric distribution with the weed) was reported in this paper.Results showed that both seed germination rate and germination index of 7 tested plants were inhibited at 0.2 g/mL aqueous extraction of L.sagitta.As concentration decrease,allelopathy intensity weaken.The allelopathy potential of aqueous extracts from different parts of the donor is different.A general inclination is the effect of root extract was more outstanding than that of leaf extract,and seed germination index was more sensitive to the extracts than germination rate.The results of germination index integrates with germination rate influenced by aqueous extracts from roots and leaves of L.sagitta showed that inhibition effect was significant to Poa annua,Bromus magnus and Elymus nutans;feebly to P.pratense and in a way promoted effect to Agropyron cristatum and B.inermis.The response to the weed allelopathy between pasture plants from different distribution areas did not present consistency change.Our results suggest that rain eluviations should be one of the means which the weed releases allelochemicals and allelopathy may play a role during L.sagitta invaded grassland and formation of mono-dominant community.In the term of vegetation restoration of degraded grassland,P.pratense,A.cristatum and B.inermis should be selected preferentially.
Publication Year: 2007
Publication Date: 2007-01-01
Language: en
Type: article
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Cited By Count: 3
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