Abstract
Petunia and carrot protoplasts have been transformed with the plasmid pCaMVCAT by the use of polyethyleneglycol (PEG) as a facilitator. Transformation was revealed by the appearance of the chloramphenicol-acetyl transferase (CAT) enzyme within the tranformed cells. Maximal activity of the CAT enzyme was detected within 15 h following transformation, while after 60 h, its activity was significantly reduced, indicating transient expression of the CAT gene. The efficiency of transformation was highly dependent on the presence of CaCl 2 in the transformation system, was stimulated by non-functional carrier DNA and was independent on the molecular weight (MW) of PEG used.
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