1.

Name the host plant and the part that Meloidegyne incognitia infects. Explain the role of Agrobacterium in production of dsRNA in host plant.

Answer»

Meloidegyne incognitia infects the roots of tobacco plant.

• By using Agrobacterium vectors, nematode-specific genes were introduced into the host plants which produce both sense and anti-sense RNA in the host cells.

• These two RNAs are complementary to each other and form a double-stranded RNA (dsRNA) that initiates RNAi and hence silence the specific mRNA of the nematode.

• The parasite cannot survive in the transgenic host, so protects the plants from pests.



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