Which Is Stronger? A Continuing Battle Between Cry Toxins and Insects

Area of Science:

• Molecular Biology
• Entomology
• Biochemistry

Background:

• Bacillus thuringiensis Cry toxins are widely used biopesticides.
• Understanding their insecticidal and insect resistance mechanisms is crucial for effective pest control.

Purpose of the Study:

• To review current knowledge on Cry toxin insecticidal mechanisms.
• To summarize insect resistance strategies against Cry toxins.
• To highlight the role of modern sequencing technologies in this research.

Main Methods:

• Literature review of recent studies on Cry toxin mechanisms.
• Analysis of insect resistance strategies, including genetic and epigenetic factors.
• Discussion of high-throughput sequencing technologies (transcriptomics, proteomics, metagenomics).

Main Results:

• Two primary models for Cry toxin action exist: sequential binding and signaling pathway.
• Insects resist Cry toxins mainly by altering receptor binding or expression.
• Epigenetics, gut microbiota, and detoxification enzymes also contribute to insect resistance.

Conclusions:

• Current models do not fully explain Cry toxin insecticidal complexity; new models are needed.
• Integrated approaches using advanced sequencing technologies are vital for future research.
• Further understanding will enhance the development and application of Cry toxins.