Transgenic tobacco plant was developed by the process of RNA interference, was resistant against the infection of

Options

A. Algae Scenedesmus
B. Fungi Fusarium
C. Bacteria : Bacillus thurigenesis
D. Nematode : Melodigyne incognita

Answer

**Step-by-Step Solution:**

1. **Understanding RNA Interference (RNAi):**
- RNA interference is a biological process where RNA molecules inhibit gene expression or translation, effectively silencing targeted mRNA. This is achieved through the introduction of double-stranded RNA (dsRNA) into the cell, which is processed into small interfering RNA (siRNA).

2. **Mechanism of RNAi:**
- The dsRNA is processed into siRNA, which then assembles into a complex known as the RNA-induced silencing complex (RISC). The siRNA guides the RISC to complementary mRNA molecules, leading to their cleavage and destruction. This prevents the translation of the mRNA into proteins.

3. **Application in Transgenic Tobacco:**
- In the case of transgenic tobacco plants, RNA interference was used to confer resistance against specific pathogens. The goal was to silence the mRNA of genes that would allow the pathogen to infect the plant.

4. **Identifying the Pathogen:**
- The question specifically asks about the infection that the transgenic tobacco plant was resistant to. The transcript mentions that the roots of tobacco plants are infected by a nematode known as *Meloidogyne incognita*.

5. **Selecting the Correct Option:**
- Among the provided options (algae, fungi, bacteria, nematode), the correct answer is the nematode *Meloidogyne incognita*. This is the pathogen that the RNA interference process was designed to protect the tobacco plant against.

6. **Conclusion:**
- Therefore, the transgenic tobacco plant developed through RNA interference is resistant to the infection caused by *Meloidogyne incognita*.

**Final Answer:**
The transgenic tobacco plant was resistant against the infection of *Meloidogyne incognita* (Option D).

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