Study on allelopathic substances releasing mode of Flaveria bidentis
FENG Jian-yong,TAO Bu,PANG Min-hao,LIU Ying-chao (College of Plant Protection,Agricultural University of Hebei,Baoding 071000,China)
In order to study the allelochemicals releasing mode of Flaveria bidentis(L.) Kuntze,F.bidentis donor plant and radish,wheat,corn,cotton as receptor plants allelopathy actions of F.bidentis were studied by adopting indoor bioassay.The results showed that the volatile matter of F.bidentis had not allelopathy to four receptor plants.The eluviated matter inhibited seedling growth of cotton obviously,the inhibition ratio of root and stem were 6.29% and 10.42% respectively.The aqueous extract of litterfall and root exudates had different inhibition to four receptor plants.The synthesis effect(SE) of all treatments was significantly greater than eluviated matter treatment except for B3 of the aqueous extract of root exudates,such as the synthesis effect of all treatments(A1,A2,A3,B1,B2,B3 and eluviation) were 44.74,29.37,14.5,31.54,16.52,3.55,1.48 respectively.Results show that F.bidentis released allelochemicals to the environment mainly by litterfall and root exudates,secondly by eluviation.
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