A species of gram-negative, aerobic bacteria isolated from soil and the stems, leafs, and roots of plants. Some biotypes are pathogenic and cause the formation of PLANT TUMORS in a wide variety of higher plants. The species is a major research tool in biotechnology.

Synonyms: Bacterium tumefaciens, Polymonas tumefaciens, Pseudomonas radiobacter, Bacterium radiobacter, Phytomonas tumefaciens, Alcaligenes radiobacter, Bacillus radiobacter, Pseudomonas tumefaciens, Agrobacterium radiobacter, Agrobacterium tumefaciens, txid358, Rhizobium radiobacter