Summary
Segments of the TL-DNA of the agropine type Ri plasmid pRi 1855 encompassing single and groups of open-reading frames were cloned in the Ti plasmid-derived binary vector system Bin 19. Leaf disc infections on Nicotiana tabacum led to transformed plants, some of which showed typical hairy root phenotypes, such as the wrinkled leaf morphology, excessive and partially non geotropic root systems and the ability of leaf explants to differentiate roots in a hormone-free culture medium. Particularly interestingly, most of these traits were shown by plants transformed with a TL-DNA segment encompassing the single ORF 11, corresponding to the rolB locus. Hairy root can be induced by this latter T-DNA segment on wounded stems of tobacco plants; hairy root induction on carrot discs requires, on the contrary, a more complex complement of TL-DNA genes.
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Abbreviations
- YMB:
-
yeast mannitol broth
- MS:
-
Murashige and Skoog medium
- 6-BAP:
-
6-benzylaminopurine
- NAA:
-
naphthalene acetic acid
- Km:
-
kanamycin
- Cb:
-
carbenicillin
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Cardarelli, M., Mariotti, D., Pomponi, M. et al. Agrobacterium rhizogenes T-DNA genes capable of inducing hairy root phenotype. Mol Gen Genet 209, 475–480 (1987). https://doi.org/10.1007/BF00331152
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DOI: https://doi.org/10.1007/BF00331152