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Cytokinin-modulated gene expression in excised pumpkin cotyledons
1Department of Life Science and Biomedical Research Institute, University of Wisconsin-Parkside, Kenosha, Wisconsin 53141.
Plant Physiology
|January 1, 1985
Summary
Benzyladenine, a cytokinin, alters protein expression in pumpkin cotyledons. This plant hormone treatment also increases messenger RNA levels and enhances hydroxypyruvate reductase activity, indicating a link to gene expression.
Area of Science:
- Plant Biology
- Molecular Biology
- Biochemistry
Background:
- Cytokinins are plant hormones crucial for growth and development.
- Gene expression regulation is fundamental to cellular processes.
Purpose of the Study:
- To investigate the effects of benzyladenine on protein and mRNA expression in pumpkin cotyledons.
- To elucidate the role of benzyladenine in regulating hydroxypyruvate reductase activity and synthesis.
Main Methods:
- Two-dimensional polyacrylamide gel electrophoresis (2D-PAGE) for protein analysis.
- Isolation and quantification of poly(A)(+) mRNA.
- Enzyme activity assays for hydroxypyruvate reductase using native gel electrophoresis.
- Inhibition studies using ethidium bromide, cycloheximide, cordycepin, and actinomycin D.
Main Results:
- Benzyladenine treatment altered the expression profiles of specific proteins in pumpkin cotyledons.
- Poly(A)(+) mRNA levels increased approximately four-fold with benzyladenine treatment.
- Hydroxypyruvate reductase activity showed a dose-dependent increase with benzyladenine concentrations.
- Enzyme activity was not inhibited by ethidium bromide, suggesting nuclear control, and was inhibited by cycloheximide, cordycepin, and actinomycin D, confirming de novo synthesis.
Conclusions:
- Cytokinin treatment, specifically benzyladenine, significantly impacts protein expression and mRNA levels in pumpkin cotyledons.
- Hydroxypyruvate reductase synthesis is regulated at the gene expression level, likely through nuclear-encoded genes.
- These findings support a strong association between cytokinin action and the regulation of gene expression in plants.