Question : Which of the following bacterium causes crown gall diseases in plants?
Option 1: Bacillus thurigiensis
Option 2: Agrobacterium tumefaciens
Option 3: Pseudomonas fluorescens
Option 4: None of these
Correct Answer: Agrobacterium tumefaciens
Solution : The correct option is Agrobacterium tumefaciens .
Crown gall disease in plants is caused by the bacterium
Agrobacterium tumefaciens
. This disease is distinguished by the development of tumor-like growths or galls on the stems, roots, and occasionally leaves of diverse plant species. The bacteria inserts a piece of its DNA, known as T-DNA, into plant cells, causing uncontrolled cell proliferation and gall formation.
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