Ri plasmid

The root inducing (Ri) -plasmid of Rhizobium rhizogenes (formerly Agrobacterium rhizogenes) is a plasmid capable of undergoing horizontal gene transfer of its transfer DNA (T-DNA), upon contact with a plant host. The T-DNA of the Ri-plasmid affects the plant host by modifying organ differentiation patterns, enhancing cell division, and making the abnormal tissue produce opines to feed the bacterium. The genes responsible for the two former activities have been described as oncogenes.

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