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Measuring Gene Expression in Bombarded Barley Aleurone Layers with Increased Throughput
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Barley aleurone layer cell protoplasts as a transient expression system.

B Gopalakrishnan1, B Sonthayanon, R Rahmatullah

  • 1Department of Biochemistry, Kansas State University, Manhattan 66506.

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|March 1, 1991
PubMed
Summary
This summary is machine-generated.

Barley aleurone protoplasts can be cultured and express reporter genes after DNA uptake. These plant cells are responsive to gibberellic acid and abscisic acid, making them suitable for studying hormone-responsive elements.

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Area of Science:

  • Plant molecular biology
  • Plant biochemistry
  • Plant cell culture

Background:

  • Barley aleurone layers are a key system for studying hydrolase gene regulation by plant hormones.
  • Efficient methods for isolating and culturing viable barley aleurone protoplasts are essential for molecular analysis.
  • Understanding hormone-mediated gene expression is crucial for plant growth and development.

Purpose of the Study:

  • To establish a method for preparing viable and hormone-responsive barley aleurone protoplasts.
  • To assess the suitability of these protoplasts for transient gene expression assays.
  • To investigate the role of plant hormones, gibberellic acid and abscisic acid, in regulating gene expression.

Main Methods:

  • Isolation of barley aleurone protoplasts using cellulase digestion and Percoll gradient purification.
  • Culture of protoplasts and assessment of viability over time.
  • Measurement of alpha-amylase synthesis in response to gibberellic acid (GA) and abscisic acid (ABA).
  • Transient gene expression analysis using plasmid DNA with reporter genes (chloramphenicol acetyl transferase - CAT) under different promoters, facilitated by polyethylene glycol (PEG).

Main Results:

  • Protoplast viability ranged from 60% to 80% within the first two days of culture.
  • Protoplasts demonstrated responsiveness to GA, indicated by stimulated alpha-amylase synthesis.
  • ABA counteracted the GA-induced stimulation of alpha-amylase synthesis.
  • Exogenously added plasmid DNA was successfully taken up and expressed by protoplasts in the presence of PEG.

Conclusions:

  • Barley aleurone layer protoplasts are viable and suitable for studying gene regulation.
  • These protoplasts are responsive to plant hormones GA and ABA.
  • The established method allows for transient gene expression analysis, enabling the study of hormone-responsive elements in hydrolase genes.