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Related to agrobacterium: Rhizobium
n. pl. agrobac·teria (-tîr′ē-ə)
Any of various aerobic, chiefly phytopathogenic bacteria of the genus Agrobacterium, especially A. tumefaciens, the cause of crown gall in plants. A. tumefaciens is used to construct transgenic plants because it transfers genetic material to plant cells when it infects them.