板栗苞壳提取物对思茅松毛虫肠道细菌的抑菌作用

[目的]研究板栗苞壳提取物对思茅松毛虫肠道细菌的抑菌作用,为害虫防治及新型植物源生物农药开发提供理论依据.[方法]以10株思茅松毛虫3龄和5龄幼虫肠道细菌为供试菌种,采用牛津杯法测定不同有机溶剂板栗苞壳提取物的抑菌效果.[结果]不同有机溶剂板栗苞壳提取物对思茅松毛虫肠道细菌均有一定的抑菌作用,且随着质量浓度的增大抑菌作用逐渐增强,各提取物的抑菌作用大小顺序为乙酸乙酯>乙醇>氯仿>正丁醇>石油醚,其中以乙酸乙酯提取物对思茅松毛虫肠道细菌的抑菌作用最强,最低抑菌质量浓度(MIC)为6.250 mg/mL,石油醚提取物的抑菌作用不明显或无抑菌作用.[结论]板栗苞壳提取物可作为新型植物源生物农药在思茅松毛虫防治中加以开发利用.

Inhibition effect of Castanea mollissima Blume bract extract on intestinal bacteria in Dendrolimu kikuchii Matsumura

【Objective】This research studied the inhibition effect of Castanea mollissima Blume bract extract on intestinal bacteria in Dendrolimu kikuchii Matsumura in order to create new biological pesticides developed from plant sources and to provide theoretical basis for pesticide development. 【Method】Using 10 strains of intestinal bacteria extracted from age 3 and age 5 Dendrolimu kikuchii Matsumura instar larvae as test strains， the inhibition effect of different organic Castanea mollissima Blume bract extract solvents was determined using the Oxford cup method. 【Result】Different organic solvents of Castanea mollissima Blume bract extract had some inhibition effects on intestinal bacteria in Dendrolimu kikuchii Matsumura. As the quality concentration increased， the inhibition effect became more noticeable； different extractions were arranged in the following rank from the strongest inhibition rate to the weakest inhibition rate: acetic ether> ethanol>chloroform>butyl alcohol>light petroleum. Ethyl acetate extract exhibited strong inhibition activity on the intestinal bacteria of Dendrolimu kikuchii Matsumura. The minimum inhibitory concentration （MIC） was 6.250 mg/mL， and the inhibition effect of petroleum ether extract was not obvious or non-existent. 【Conclusion】Castanea mollissima Blume bract extract could be developed as the new plant biological source pesticide to control Dendrolimu kikuchii Matsumura.