Summary
Genetic transformation of Nicotiana tabacum protoplasts was achieved by incubation of protoplasts with a plasmid DNA-calcium phosphate coprecipitate, followed by fusion of the protoplasts in the presence of polyvinyl alcohol and subsequent exposure to high pH. A derivative of the plasmid pBR322 containing a chimaeric gene, consisting of the nopaline synthase promoter, the coding region of the aminoglycoside phosphotransferase gene of Tn5 and the polyadenylation signal region of the octopine synthase gene, was used for these transformation experiments. This chimaeric gene confers resistance of transformed plant cells to kanamycin. This novel transformation procedure reproducibly yielded transformants at frequencies of approximately 0.01%. Aminoglycoside phosphotransferase II activity was detected in both transformed calli and in regenerated plants. DNA from some of the transformed clones was analyzed by Southern blot hybridization. The input DNA appears to be integrated into high molecular weight cellular DNA. Genetic analysis of one of the kanamycin resistant plants shows that the chimaeric gene is transmitted to the progeny as a single dominant trait in a Mendelian fashion. As a comparison the input DNA was also introduced into tobacco protoplasts using Agrobacterium tumefaciens and Ti-plasmid derived gene vectors.
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Communicated by J. Schell
Dedicated to Professor Georg Melchers to celebrate his 50-year association with the journal
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Hain, R., Stabel, P., Czernilofsky, A.P. et al. Uptake, integration, expression and genetic transmission of a selectable chimaeric gene by plant protoplasts. Molec Gen Genet 199, 161–168 (1985). https://doi.org/10.1007/BF00330254
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DOI: https://doi.org/10.1007/BF00330254