Silencing of mRNA has been used in producing transgenic plants resistant to?

The correct option is A

Nematodes

The correct option is option A.

Explanation of the correct option:

1. Through RNA interference procedure, specific mRNA molecules are deactivated.
2. The nematode is a parasite of the tobacco plant that causes a reduction in its yield.
3. Specific genes were introduced through the Agrobacterium vector to the tobacco plant causing silencing of mRNA of the nematodes residing in it.

Explanation of the incorrect options:

Option B:

Bollworms are moth larvae that attack the cotton plants.

Option C:

1. It is a disease of barley.
2. It is caused by Xanthomonas campestris.

Option D:

White rust is a disease of plants caused by Albugo candida.

Final answer: Silencing of mRNA has been used in producing transgenic plants resistant to nematodes.