Answer:
Agrobacterium tumefaciens is a gram negative bacteria that is responsible for tumor formation in the different parts of plant body.
Explanation:
It causes crown-gall disease in plant body by transferring it's DNA into the plant body which include Ti plasmid.
There are 3 types of bacteria that form tumor in different plant ares.
Agrobacterium rhizogenes, Agrobacterium tumefaciens strains contain either Ti or Ri plasmid but Agrobacterium vitis contain only Ti plasmid which are virulent.
The transfer of T-DNA takes place into the body of host cells and then the DNA is expressed into the body of the host and thus forming gall or tumor.
