Allelopathy of Ageratum conyzoides L.
胜红蓟化感作用研究Ⅶ.胜红蓟素类似物的合成及其对植物与微生物的抑制作用

Five analogs of ageratochromene were synthesized and their inhibitory effect on plants and microorganisms were compared with that of ageratochromene. Results showed that two analogs,6 formyl 7 methoxyl 2,2 dimethy1 2H benzopyran and 7 hydroxyl 6 formyl 3,4 dihydro 2,2 dimethyl 2H benzopyran had higher inhibitory effects on two plants:radish and ryegrass than that of ageratochromene at concentration of 100mg/l,especially inhibited the root growth of plants significantly.They also possessed stronger antimicrobial activity and the inhibitory rates for two fungi( Rhizoctonia solani and Phytophthora capsici) were 100% at concentration of 400mg/l,moreover,7 hydroxyl 6 formyl 3,4 dihydro 2,2 dimethyl 2H benzopyran inhibited two bacteria species significantly: Xanthomonas oryzae pv. oryzae and Erwinia chrysanthemi at concentration of 2000mg/l.Researches revealed that 2,2 dimethyl 2H benzopyran,the basic structure of constituting ageratochromene was not correlated with its allelopathic and antimicrobial effecs.However,as there were active substituents at its 6 or 7 position,both effects were strengthen significantly.