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Published on: March 15, 2018
An improved cytokinin bioassay using cultured soybean hypocotyl sections
1Department of Biology, Boston College, Chestnut Hill, Massachusetts 02167.
Plant Physiology
|June 1, 1976
Summary
A new soybean tissue culture bioassay accurately measures cytokinins. This method offers improved convenience and resolution for plant hormone research.
Area of Science:
- Plant Science
- Biotechnology
- Hormone Biology
Background:
- Cytokinins are essential plant hormones regulating growth and development.
- Accurate quantification of cytokinins is crucial for plant research.
- Existing bioassays, like the soybean callus assay, have limitations.
Purpose of the Study:
- To develop and validate a modified soybean tissue culture bioassay for cytokinins.
- To improve upon the convenience, variability, and resolution of existing cytokinin bioassays.
- To assess the specificity of the new assay compared to conventional methods.
Main Methods:
- Utilizing sterile soybean (Glycine max) hypocotyl sections (1-mm).
- Culturing sections on callus medium with varying zeatin concentrations (0.0005 to 1 µM).
- Incubating cultures for 5, 9, 13, or 22 days and measuring fresh weight.
Main Results:
- Fresh weight of soybean sections showed a dose-dependent increase with cytokinin concentration.
- Two-fold differences in cytokinin concentration were distinguishable by day 9.
- The modified assay demonstrated comparable specificity to the conventional soybean callus bioassay.
Conclusions:
- The modified soybean tissue culture bioassay provides a reliable method for cytokinin quantification.
- This assay offers practical advantages including enhanced convenience and reduced variability.
- The improved resolution makes it a valuable tool for plant hormone studies.
