蟛蜞菊水抽提物的生化他感作用研究

蟛蜞菊群落中很少有其它杂草。本研究证实了蟛蜞菊水抽提物对萝卜，绿豆，黄瓜，水稻４种植物幼生长和水稻种子萌发的生化他感作用，与对照的７种植物水抽提物比较，蟛蜞菊的生化他感作用最强。另外，蟛蜞菊水抽提物对大画眉草、空心莲子草２种杂草茎节萌发和幼苗生长有生化他感，在高浓度下对蟛蜞菊本身茎萌发和幼苗生长有自毒作用，在根，茎，叶，花，总植株５种水抽提物中，生化他感作用强到弱的顺序是：叶＞茎＞花＞总植株＞根。

STUDIES ON THE ALLELOPATHIC EFFECTS OF Wedelia chinensis AQUEOUS EXTRACTION

Wedelia chinensis(Os) Merr.is a common garden herb in South China. Thereis little weed within its community.The allelopathic effects of Wedelia chinensis aqueousextractions on seedling growth ofradish, mungbean,cucumber, riee and seed germinationof rice were tested. Comparied with the checks of aqueous extractsfrom other 7 piants. alleloDathic effects of Wedelia chinensis were the strongest. In addition, aqueous ex- tracts of the plant also showed its allelopathic effects on the germination and seed- ling growth of Alternanthera philoxeroides and Eragrostics cilianesis Highconcentration aqueous extracts had autotoxic effects on the germination and seedlinggrowth of Wedelia chinensis.The comparsion of allelopathic effects of the four organsand whole plant of Wedelia chinensis,the declining order was: leaf> stem>flower>whole plant > root.