A  tumor-inducing  (Ti)  plasmid of the
   bacterium  Agrobacterium  tumifaciens  can be used as a vector for DNA
   cloning in plants.

   The  plasmid  T  DNA,  necessary  for  integration,  are combined with
   bacterial DNA that contain an origin of replication (ori), restriction
   sites and antibiotic resistance genes (Kan^R and tet^R).

   When  the  bacterium  infects  a  plant,  the T DNA, together with any
   cloned  DNA, integrates into a host chromosome, producing a transgenic
   plant.

   This process is caled transformation.