Chemical Composition and Allelopathic Activity of Oil and Volatile Fractions of Conyza albida Willd.ex Sprengel from Greece

摘要

The oil of the fresh aerial parts of Conyza albida and its fractions were analyzed by GC/M S.Fifty-five components were identified with cis-lachnophyllum ester(30.0%)being the main compound.Furthermore,the allelopathic potential of the oil and its fractions was evaluated using two sensitive indicators,Avena sativa and Spirodella polyrhiza.Essential oils are used for medicinal drugs,controlling harmful insects,antimicrobial/antifungal activity and more often recently for allelochemicals among plants of agricultural importance(1-4).Several monoterpenes and sesquiterpenes have been implicated in allelopathy.Allelopathy,the direct or indirect effect of one plant on another through the production of chemical compounds that escape into the environment,occurs widely in natural plant communities.Plants have their own defense mechanisms and allelochemicals are,in fact,natural herbicides.