Q. 194.0( 2 Votes )
Bacillus thuringiensis is the bacteria from which the Bt toxin gene was isolated. The Bt toxin gene is coded by the genes cryIAc and cryIIAb.
• Bacillus thuringiensis forms crystals containing a toxic called insecticidal Crystal protein.
• When this inactive Bt toxin is ingested by the insect, it is converted into an active form.
• Due to the alkaline pH conditions of the gut of the insect, the toxin crystals get solubilised.
• The activated toxin then binds to the epithelial cells present on the surface of the gut.
• They create pores that causes the cells to swell and break/lyse, eventually killing the insect.
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