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《Plant Protection》 2014-03
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Antibacterial activity and related mechanism of four terpenoids on the pathogen of Phalaenopsis amabilis stem rot

Ding Lan;He Miao;Wang Baoqiang;Liu Guo'an;College of Life Sciences,Northwest Normal University;  
In this study,twelve Gram-negative bacteria and two fungi from Phalaenopsis amabilis stem rot were tested to evaluate the antibacterial activity of the ent-kaurane diterpenoids(leukamenin E and weisiensin B)and the triterpenes(ursolic acid and 2-α-hydroxy ursolic acid).In addition,the antibacterial activity of leukamenin E to Fusarium oxysporum was preliminarily studied.The results showed that the antibacterial activity of leukamenin E was the strongest to the two fungi,while that of weisiensin B was the weakest and the two triterpenes had moderate activity.Leukamenin E at 800μmol/L could destroy the F-actin cytoskeleton of F.oxysporum,and make the cell membrane of F.oxysporum magnify obviously,resulting in hindered growth of mycelium polarity.The antibacterial activity of the four terpenoids showed obvious characteristics of selectivity and complementarity on twelve bacteria.Leukamenin E had antibacterial activity to five bacteria,while weisiensin B had antibacterial activity to other four bacteria.Weisiensin B had the antibacterial activity to the bacteria that were insensitive to two kinds of triterpenes.The test revealed that the diversity of molecular structure of terpenoids fromIsodon plants had important significance in chemical ecology.
【Fund】: 西北师范大学知识与科技创新工程项目(NWNU-KJCXGC-03-65);; 国家自然科学基金(30960464)
【CateGory Index】: S436.81
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