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 δendotoxin to present the progress of studies on these points. The mode of action of δendotoxin includes 5 steps: solubilization, degradation, binding with receptors, intercalation and formation of pore or channel. In order to improve the toxicity of δendotoxin, various physical and chemical factors including plant allelochemicals are used for strengthening the solubilization, degradation of δendotoxin, or the interaction between δendotoxin and insect midgut. Other means such as screening higher toxicity strains of Bt, using the feeding stimulants to increase larval ingestion, protecting δendotoxin from ultraviolet irradiation and cooperatinig with other microbes, are also proved to be effective in the potentiation of δendotoxin.
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