First slide

Biotechnological Applications in Agriculture

Question

The poison of Bacillus thuringiensis is activated by ______

Easy

A

acidic pH of insect stomach.
B

high temperature.
C

alkaline pH of insect gut.
D

enzymes in insect gut.

Solution

B. thuringiensis forms protein crystals during a particular phase of their growth. These crystals contain a toxic insecticidal protein. Actually, the Bt toxin protein exist as inactive protoxins but once an insect ingest the inactive toxin, it is converted into an active form of toxin due to the alkaline pH of the gut which solubilise the crystals.

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