A Really Useful Pathogen, Agrobacterium tumefaciens. 

(With Ze-Chun Yuan) - Bacteria of the genus Agrobacterium are very useful and unusual plant pathogens. Through a rare inter-kingdom DNA transfer, the bacteria move some of their genes into
their host's genome, thereby inducing the host cells to proliferate and produce opines, nutrients sources for the pathogen. Agrobacterium's ability to transfer DNA makes can be adapted to introduce other genes, such as those encoding useful traits, into plant genomes. The development of Agrobacterium as a tool to transform plants is a landmark event in modern plant biology. This lecture provides an introduction to Agrobacterium tumefaciens and
related species, focusing on their modes of pathogenicity, their
usefulness as tools for plant transformation, and their use as a model
for the study of plant-pathogen interactions. Posted October 23, 2012, revised December 24, 2014 by Ze-Chun Yuan, Vagner Benedito (vagner.benedito@mail.wvu.edu), and Mary Williams. www.plantcell.org/cgi/doi/10.1105/tpc.112.tt1012