What triggers the activation of protoxin to active Bt toxin of Bacillus thuringiensis in bollworms?
Acidic pH of the stomach
Body temperature
Moist surface of midgut
Alkaline pH of the gut
The Bt toxin protein exists as inactive protoxins. Once an insect ingests the inactive toxin, it is converted into an active form of toxin due to the alkaline pH of the gut, which solubilises the crystals .
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