A tumour inducing plasmid widely used in the production of transgenic plants is that of

Options

A. Escherichia coli
B. Bacillus thuringiensis
C. Staphylococcus aureus
D. Agrobacterium tumefaciens

Answer

To solve the question regarding the tumor-inducing plasmid widely used in the production of transgenic plants, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Options**: The question provides four options:
- Escherichia coli
- Bacillus thuringiensis
- Staphylococcus aureus
- Agrobacterium tumefaciens

2. **Analyzing Each Option**:
- **Escherichia coli**: This bacterium is primarily used for producing proteins, such as insulin, but it is not known for inducing tumors in plants.
- **Bacillus thuringiensis**: This bacterium produces a toxin (Bt toxin) that is used for pest resistance in plants, but it does not induce tumors.
- **Staphylococcus aureus**: This bacterium is known for its role in various infections and is used as a recombinant vector, but it does not have a role in tumor induction in plants.
- **Agrobacterium tumefaciens**: This bacterium is known for its ability to transfer a specific segment of its DNA, called T-DNA (tumor-inducing DNA), into plant cells, causing them to form tumors.

3. **Identifying the Correct Answer**: Among the options, Agrobacterium tumefaciens is the only one that produces a tumor-inducing plasmid (T-DNA) that is widely used in the genetic engineering of plants to create transgenic plants.

4. **Conclusion**: Therefore, the correct answer to the question is **Agrobacterium tumefaciens**.

### Final Answer:
The tumor-inducing plasmid widely used in the production of transgenic plants is that of **Agrobacterium tumefaciens**.