Which of the following bacteria is used as a vector for plant genetic engineering?

Agrobacterium tumefaciens

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Bacteriophages

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Thermus aquaticus

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Pyrococcus furiosus

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Solution

The correct option is A Agrobacterium tumefaciens
Since A. tumefaciens is a natural plant genetic engineer known to induce tumours in plants by transferring j and integrating its DNA into the host genome. Therefore, by slightly manipulating, i.e., removing the tumour causing genes and replacing them with desired genes, it can be easily used as a plant vector.
So, the correct answer is 'Agrobacterium tumefaciens'.

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