Cry-1 endotoxins,which are obtained from Baci | vedclass

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(D) The bacterium $Bacillus$ $thuringiensis$ $(Bt)$ produces protein crystals during a particular phase of their growth. These crystals contain a toxi

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Bollworms

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(D) The bacterium $Bacillus$ $thuringiensis$ $(Bt)$ produces protein crystals during a particular phase of their growth. These crystals contain a toxic insecticidal protein. The $Bt$ toxin protein exists as inactive protoxins but 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 solubilizes the crystals. The activated toxin binds to the surface of midgut epithelial cells and creates pores that cause cell swelling and lysis and eventually cause death of the insect. Specific $Bt$ toxin genes were isolated from $Bacillus$ $thuringiensis$ and incorporated into several crop plants such as cotton. The toxins coded by a gene like $cryIAc$ and $cryIIAb$ control the cotton bollworms. Therefore,$Cry-1$ endotoxins are effective against bollworms.

Cry-$1$ endotoxins,which are obtained from $Bacillus$ $thuringiensis$,are effective against ...........

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