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Strain T1K, reported to be Rhizobium trifolii strain T1 carrying the drug resistance plasmid RU-1drd, was able to transfer a cluster of nif+ genes to Escherichia coli K-12. Additional genetic material, resembling the gal-chlA region of E. coli, was also transferred from strain T1K. The segregation pattern of these transferred genes suggested that they were on a plasmid. Although strain TIK was able to nodulate red and white clover, it also formed very slow-growing galls on tomato stems and shared many physiological properties with Agrobacterium tumefaciens, to which it seemed more closely related than to R. trifolii. The R. trifolii hybrid T1 (R1-19drd), constructed by conjugation, did not share any of these properties of both A. tumefaciens. Thus, strain T1K appears to be a bacterium with properties of both A. tumefaciens and R. trifolii and with the capacity to transfer nif+ genes and other functions which it may have "cloned" from another bacterium such as Klebsiella.

Transfer of nitrogen fixation genes from a bacterium with the characteristics of both Rhizobium and Agrobacterium