Abstract
THE gram-negative bacterium Agrobacterium tumefaciens induces crown gall tumours in many, mostly dicotyledonous, plants. Zaenen et al.1 demonstrated the presence of one or more large plasmids in a number of crown gall-inducing Agrobacterium strains belonging to seven different Agrobacterium groups. They were not able to find such plasmids in eight non-pathogenic Agrobacterium strains belonging to four of the same groups2,3. They therefore formulated the hypothesis that the genetic information for the tumour-inducing principle4 in crown gall-inducing Agrobacterium strains is carried by one or several large plasmids.
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References
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LAREBEKE, N., ENGLER, G., HOLSTERS, M. et al. Large plasmid in Agrobacterium tumefaciens essential for crown gall-inducing ability. Nature 252, 169–170 (1974). https://doi.org/10.1038/252169a0
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DOI: https://doi.org/10.1038/252169a0
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