Question

Explain the role of Ti plasmids in biotechnology.

Answer 1

Hint: A plasmid is a small extrachromosomal DNA molecule that can replicate independently of chromosomal DNA and is physically distinct from it. They're most often seen in bacteria as tiny circular double-stranded DNA molecules. They are extensively used in gene cloning experiments as vectors for the transformation of genes of interest into the host cells.

Complete answer:
The plasmid of Agrobacterium tumefaciens is known as Ti plasmid (Tumor-inducing plasmid). The plant pathogen A. tumefaciens is known to cause tumours in the plants it infects.
The role of Ti plasmid in biotechnology is that it may be converted into a cloning vector by deleting the pathogenicity genes.
The Ti plasmid delivers a DNA fragment into normal plant cells, causing them to convert into tumour cells. Tumor cells also include genes for the production of auxin and cytokinin hormones, thus their introduction into a plant aids in the production of the plant's own nutrition machinery.
Because of its comparatively high effectiveness during transformation, Ti plasmid is the most widely employed in gene cloning. The tumor-inducing plasmid contains many components that aid in the efficient transfer of genes of interest into plant cells.
The DNA segment to be transferred into the plant is created by the T-DNA sequence.
The T-DNA region must be transferred to the plant, which necessitates the presence of virulence genes.
The T-DNA region that has been edited to eliminate the genes that trigger crown gall development and replace them with the genes of interest.

Note:
Ti Plasmid is a plasmid found in pathogenic Agrobacterium species such as Agrobacterium tumefaciens, Agrobacterium rhizogenes, Agrobacterium rubi, and Agrobacterium vitis. For the bacteria to produce crown gall disease in plants, this Ti plasmid must be present. Certain essential portions of the Ti plasmid, including as the vir region, which encodes for virulence genes, and the transfer DNA (T-DNA) area, aid in this process.