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苏云金芽孢杆菌δ-内毒素的杀虫机理及其增效途径 被引量:24

MECHANISM AND POTENTIATION OF BACILLUS THURINGIENSIS δENDOTOXIN INSECTICIDAL ACTIVITY
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摘要 苏云金芽孢杆菌(Bacilusthuringiensis,Bt)制剂是当前应用最广、最有效的微生物杀虫剂。Bt属于革兰氏阳性细菌,在形成芽孢的同时,产生伴孢晶体。伴孢晶体是Bt杀虫活性的主要来源,它可能由几种晶体蛋白即δ-内毒素组成。δ-内毒素的专一... \ Bacillus thuringiensis (Bt) has been widely used because of its specificity for target insects, its low development cost and its environmental compatibility. Much efforts are devoted to the mechanism of its action and the enhancement of its toxicity. This paper is confined to CryⅠ δendotoxin to present the progress of studies on these points. The mode of action of δendotoxin includes 5 steps: solubilization, degradation, binding with receptors, intercalation and formation of pore or channel. In order to improve the toxicity of δendotoxin, various physical and chemical factors including plant allelochemicals are used for strengthening the solubilization, degradation of δendotoxin, or the interaction between δendotoxin and insect midgut. Other means such as screening higher toxicity strains of Bt, using the feeding stimulants to increase larval ingestion, protecting δendotoxin from ultraviolet irradiation and cooperatinig with other microbes, are also proved to be effective in the potentiation of δendotoxin.
出处 《昆虫学报》 CAS CSCD 北大核心 1998年第3期323-332,共10页 Acta Entomologica Sinica
基金 国家自然科学基金 中国科学院动物研究所所长择优基金
关键词 苏云金芽孢杆菌 δ-内毒素 杀虫机理 增效途径 Bacillus thuringiensis, mode of action, potentiation
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