Lipofectin: direct gene transfer to higher plants using cationic liposomes.

Area of Science:

• Plant Biotechnology
• Molecular Biology
• Genetics

Background:

• Cationic liposomes like Lipofectin are known for cell transfection.
• Their application in higher plant protoplast transformation requires further investigation.

Purpose of the Study:

• To assess Lipofectin's toxicity and efficacy for plant protoplast transformation.
• To evaluate its use in transient gene expression and stable plant transformation.

Main Methods:

• Lipofectin-mediated gene transfer into *Nicotiana tabacum* and *Nicotiana plumbaginifolia* mesophyll protoplasts.
• Transient expression assays using the β-glucuronidase (GUS) gene.
• Stable transformation using the neomycin phosphotransferase (NPTII) gene with kanamycin selection.
• Confirmation via enzyme activity, genomic blotting, and progeny analysis.

Main Results:

• Lipofectin demonstrated toxicity to higher plant protoplasts.
• Transient GUS gene expression was lower compared to polyethylene glycol (PEG) mediated delivery.
• Stable transformation efficiencies using Lipofectin were comparable to PEG and/or electroporation.
• Transformed plants were regenerated and confirmed through molecular and phenotypic analyses.

Conclusions:

• Lipofectin is a viable tool for stable plant transformation, achieving efficiencies comparable to established methods.
• Further optimization is needed to mitigate toxicity and enhance transient expression levels.
• The study validates Lipofectin's utility in genetic engineering of *Nicotiana* species.