Acta Entomologica Sinica (1998) 41, 323-332

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Jihong Zhang, Chenzhu Wang and Junde Qin (1998)
[Mechanism and potentiation of Bacillus thuringiensis delta-endotoxin insecticidal activity]
Acta Entomologica Sinica 41 (3), 323-332
Abstract: 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 Cry I delta-endotoxin to present the progress of studies on these points. The mode of action of delta-endotoxin includes 5 steps: solubilization, degradation, binding with receptors, intercalation and formation of pore or channel. In order to improve the toxicity of delta-endotoxin, various physical and chemical factors including plant allelochemicals are used for strengthening the solubilization, degradation of delta-endotoxin, or the interaction between delta-endotoxin and insect midgut. Other means such as screening higher toxicity strains of Bt, using the feeding stimulants to increase larval ingestion, protecting delta-endotoxin from ultraviolet irradiation and cooperatinig with other microbes, are also proved to be effective in the potentiation of delta-endotoxin.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Chinese)
Database assignments for author(s): Chen-Zhu Wang

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
formulation/storage of bioagents

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Bacillus thuringiensis Cry1A-toxin (entomopathogen)