Which of the following is used as a best genetic vector in plants?

Options

A. Bacillus thuriengenesis
B. Agrobacterium tumefaciens
C. Pseudomonas putida
D. All of these

Answer

To determine the best genetic vector used in plants, we need to analyze the options provided:

1. **Bacillus thuringiensis**: This bacterium is primarily known for its role in pest control due to its production of insecticidal proteins. While it has applications in biotechnology, it is not primarily used as a genetic vector in plants.

2. **Agrobacterium tumefaciens**: This bacterium is well-known for its ability to transfer DNA to plant cells. It contains a plasmid known as the Ti (tumor-inducing) plasmid, which is used as a vector for genetic engineering in plants. This makes it a strong candidate for the best genetic vector in plants.

3. **Pseudomonas putida**: This bacterium is used in bioremediation and has applications in biotechnology, but it is not recognized as a primary genetic vector for plant transformation.

4. **All of these**: This option suggests that all the mentioned organisms are equally effective as genetic vectors in plants, which is not accurate based on the specific roles of each.

Based on the analysis of the options, the best genetic vector in plants is:

**Answer: Agrobacterium tumefaciens**

### Step-by-Step Solution:

1. **Identify the Options**: Review the options given: Bacillus thuringiensis, Agrobacterium tumefaciens, Pseudomonas putida, and all of these.

2. **Understand the Role of Each Organism**:
- Bacillus thuringiensis is used for pest control.
- Agrobacterium tumefaciens is known for transferring DNA to plants.
- Pseudomonas putida is used in bioremediation.

3. **Focus on Genetic Vectors**: Recall that genetic vectors are used to transfer genetic material into host cells. The Ti plasmid from Agrobacterium tumefaciens is specifically designed for this purpose in plants.

4. **Evaluate the Best Option**: Since Agrobacterium tumefaciens is the only organism listed that is specifically used as a genetic vector in plants, it is the best choice.

5. **Conclude the Answer**: The best genetic vector in plants is Agrobacterium tumefaciens.