Question:
‘Ti’ plasmid of which bacterium is used for obtaining Transgenic plants
‘Ti’ plasmid of which bacterium is used for obtaining Transgenic plants
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Ti plasmid = natural vector for plant genetic engineering.
Updated On: Jul 18, 2026
- Pseudomonas
- Xanthomonas
- Agrobacterium tumefaciens
- Salmonella
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The Correct Option is C
Solution and Explanation
Step 1: Understanding genetic engineering tool.
The Ti (Tumor inducing) plasmid is a naturally occurring plasmid found in certain soil bacteria. It is widely used as a vector in plant genetic engineering. This plasmid has the ability to transfer genes into plant cells.
Step 2: Role of Agrobacterium tumefaciens.
Agrobacterium tumefaciens is a soil bacterium that infects plants and causes crown gall disease. During infection, it transfers a segment of its DNA (T-DNA) into plant genomes. This natural gene transfer ability is exploited in biotechnology.
Step 3: Mechanism of Ti plasmid.
The Ti plasmid contains T-DNA and vir genes responsible for DNA transfer. Scientists modify this plasmid to insert desired genes instead of tumor-causing genes.
Step 4: Evaluation of other options.
Pseudomonas, Xanthomonas, and Salmonella do not possess Ti plasmids. They are not used for plant genetic transformation. Hence they are incorrect choices.
Step 5: Biotechnology significance.
Ti plasmid is considered a natural genetic engineer because it can insert foreign genes into plant chromosomes efficiently.
Step 6: Final conclusion.
Thus, Agrobacterium tumefaciens is the correct answer.
The Ti (Tumor inducing) plasmid is a naturally occurring plasmid found in certain soil bacteria. It is widely used as a vector in plant genetic engineering. This plasmid has the ability to transfer genes into plant cells.
Step 2: Role of Agrobacterium tumefaciens.
Agrobacterium tumefaciens is a soil bacterium that infects plants and causes crown gall disease. During infection, it transfers a segment of its DNA (T-DNA) into plant genomes. This natural gene transfer ability is exploited in biotechnology.
Step 3: Mechanism of Ti plasmid.
The Ti plasmid contains T-DNA and vir genes responsible for DNA transfer. Scientists modify this plasmid to insert desired genes instead of tumor-causing genes.
Step 4: Evaluation of other options.
Pseudomonas, Xanthomonas, and Salmonella do not possess Ti plasmids. They are not used for plant genetic transformation. Hence they are incorrect choices.
Step 5: Biotechnology significance.
Ti plasmid is considered a natural genetic engineer because it can insert foreign genes into plant chromosomes efficiently.
Step 6: Final conclusion.
Thus, Agrobacterium tumefaciens is the correct answer.
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