Search results for "Insecticidal crystal proteins"

showing 3 items of 3 documents

Insect resistance to Bacillus thuringiensis insecticidal crystal proteins

2000

Several insect species have developed resistance to insecticidal crystal proteins from Bacillus thuringiensis, either through laboratory selection, or under field conditions. In this chapter we review the current knowledge on the biochemical and genetic mechanisms of resistance to B. thuringiensis. This knowledge will be important in the design of appropriate tactics to manage the development of resistance in insect populations.

GeneticsbiologyResistance (ecology)Bacillus thuringiensismedia_common.quotation_subjectfungiInsectInsecticidal crystal proteinsbiology.organism_classificationSelection (genetic algorithm)Field conditionsmedia_common
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Biochemistry and genetics of insect resistance to Bacillus thuringiensis.

2001

▪ Abstract  Bacillus thuringiensis (Bt) is a valuable source of insecticidal proteins for use in conventional sprayable formulations and in transgenic crops, and it is the most promising alternative to synthetic insecticides. However, evolution of resistance in insect populations is a serious threat to this technology. So far, only one insect species has evolved significant levels of resistance in the field, but laboratory selection experiments have shown the high potential of other species to evolve resistance against Bt. We have reviewed the current knowledge on the biochemical mechanisms and genetics of resistance to Bt products and insecticidal crystal proteins. The understanding of th…

Pesticide resistanceInsectamedia_common.quotation_subjectBacillus thuringiensisInsectGenetically modified cropsBiologyInsecticide ResistanceBacillus thuringiensisAnimalsInsecticidal crystal proteinsPest Control BiologicalEcology Evolution Behavior and Systematicsmedia_commonGeneticsResistance (ecology)business.industryDipterafungiPest controlbiology.organism_classificationBiotechnologyColeopteraLepidopteraCry1AcInsect SciencebusinessAnnual review of entomology
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Lack of cross‐resistance to otherBacillus thuringiensiscrystal proteins in a population ofPlutella xylostellahighly resistant to cryia(b)

1994

Competition experiments were performed with brush border membrane vesicles of diamondback moth larvae using 125I‐labelled CryIA(b) and unlabelled CryIA(a), CryIA(b) and CryIA(c). The results suggested a model with a single binding site for CryIA(b). Heterologous competition showed that CryIA(c) competed as effectively as CryIA(b) for the CryIA(b) binding site, whereas CryIA(a) competed less effectively. Toxicity tests were performed on third instar larvae with trypsin‐activated insecticidal crystal proteins (ICPs) and a commercial formulation of Bacillus thuringiensis (Bt) (Dipel). A laboratory colony was found to be susceptible to all four ICPs tested and to Dipel. CryIA(b), CryIA(c) and C…

education.field_of_studyDiamondback mothbiologyfungiPopulationPlutellabiology.organism_classificationMolecular biologyInsect ScienceBacillus thuringiensisBotanyInsecticidal crystal proteinseducationAgronomy and Crop ScienceCross-resistanceBiocontrol Science and Technology
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