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A Simple Method for Isolation of Soybean Protoplasts and Application to Transient Gene Expression Analyses
Published on: January 25, 2018
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Factors affecting transient gene expression in electroporated Glycine max protoplasts
1Plant and Animal Biotechnology Laboratory, Department of Agronomy, University of Illinois at Urbana-Champaign, 1201 West Gregory, 61801, Urbana, IL, USA.
Plant Cell Reports
|November 14, 2013
Summary
Optimizing electroporation conditions enhances transient gene expression in soybean protoplasts. This research identifies key parameters for efficient delivery and expression of reporter genes, chloramphenicol acetyl transferase (CAT) and β-glucuronidase (GUS).
Area of Science:
- Plant Biotechnology
- Molecular Biology
- Genetics
Background:
- Transient gene expression is crucial for studying gene function in plants.
- Soybean (Glycine max) protoplasts are a valuable system for plant transformation research.
- Optimizing electroporation parameters is essential for efficient gene delivery.
Purpose of the Study:
- To evaluate parameters affecting transient gene expression in Glycine max protoplasts using electroporation.
- To determine optimal conditions for maximizing reporter gene activity (CAT and GUS).
- To assess the efficiency of electroporation for soybean transformation studies.
Main Methods:
- Electroporation of Glycine max protoplasts.
- Assay of reporter enzyme activity for chloramphenicol acetyl transferase (CAT) and β-glucuronidase (GUS).
- Optimization of field strength, capacitance, protoplast concentration, DNA concentration, and incubation time.
Main Results:
- Protoplast viability and reporter gene activity were dependent on field strength.
- Maximum CAT and GUS activity was achieved at 500 V/cm, 1000 μF, and a protoplast concentration of 1-3 × 10(6)/ml.
- Transformation efficiencies reached up to 1.6% GUS-positive protoplasts.
- Transient gene expression increased with plasmid DNA concentration and time post-electroporation (peaking at 48 hr).
- Polyethylene glycol (5.6%) and heat shock (5 min at 45 °C) enhanced transformation efficiency.
- Simultaneous increase in CAT and GUS activity suggested increased DNA uptake by more cells.
Conclusions:
- Optimized electroporation protocols significantly enhance transient gene expression in soybean protoplasts.
- Both GUS and CAT serve as effective screenable markers for soybean transformation studies.
- This study provides a foundation for further genetic manipulation of soybean.
