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. 1985 Nov;4(11):2731–2737. doi: 10.1002/j.1460-2075.1985.tb03996.x

Liposome-mediated transformation of tobacco mesophyll protoplasts by an Escherichia coli plasmid.

A Deshayes, L Herrera-Estrella, M Caboche
PMCID: PMC554571  PMID: 3905385

Abstract

An Escherichia coli plasmid, pLGV23neo, carrying a kanamycin resistance gene expressed in plant cells, was encapsulated into negatively charged liposomes prepared by the reverse phase evaporation technique. These liposomes were induced to fuse with tobacco mesophyll protoplasts by polyethyleneglycol treatment. Kanamycin-resistant clones were reproducibly isolated from transfected cultures at an average frequency of 4 X 10(-5). Plants regenerated from these resistant colonies were confirmed to be transformed according to three criteria. Protoplasts isolated from their leaves were resistant to 100 micrograms/ml kanamycin. The enzyme aminoglycoside 3'-phosphotransferase II encoded by the plasmid pLGV23neo was detected in leaf extracts. Approximately 3-5 copies of the gene encoding for kanamycin resistance were inserted in the genome of at least one of the studied transformants. The restriction pattern of inserted DNA was best explained by assuming a tandem integration of the pPLGV23neo sequences, implying an homologous recombination event between these sequences during transformation. Kanamycin resistance was transmitted as a single dominant nuclear marker to the progeny of resistant plants after selfing or cross-pollination with the wild-type.

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