Abstract
Agrobacterium species genetically transform plants by transferring a region of plasmid DNA, T-DNA, into host plant cells. The bacteria also transfer several virulence effector proteins. T-DNA and virulence proteins presumably form T-complexes within the plant cell. Super-T-complexes likely also form by interaction of plant-encoded proteins with T-complexes. These protein-nucleic acid complexes traffic through the plant cytoplasm, enter the nucleus, and eventually deliver T-DNA to plant chromatin. Integration of T-DNA into the plant genome establishes a permanent transformation event, permitting stable expression of T-DNA-encoded transgenes. The transformation process is complex and requires participation of numerous plant proteins. This review discusses our current knowledge of plant proteins that contribute to Agrobacterium-mediated transformation, the roles these proteins play in the transformation process, and the modern technologies that have been employed to elucidate the cell biology of transformation.
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