Related Experiment Videos
An improved bioassay for cytokinins using cucumber cotyledons.
R A Fletcher1, V Kallidumbil, P Steele
1Department of Environmental Biology, University of Guelph, Guelph, Ontario, Canada N1G 2W1.
Plant Physiology
|March 1, 1982
Summary
This study enhances the cucumber cotyledon greening bioassay for detecting plant hormones called cytokinins. The improved method increases sensitivity tenfold, allowing detection of extremely low cytokinin concentrations.
Area of Science:
- Plant biology
- Biochemistry
- Hormone analysis
Background:
- The cucumber cotyledon greening bioassay is a standard method for detecting cytokinins.
- Modifications are needed to improve the assay's sensitivity and detection limits.
Purpose of the Study:
- To enhance the cucumber cotyledon greening bioassay for more sensitive cytokinin detection.
- To evaluate the efficacy of modified assay conditions using various cytokinins.
Main Methods:
- Utilized 5-day-old cucumber (Cucumus sativus L., cv. National Pickling) cotyledons.
- Applied combinations of 40 millimolar KCl and varying cytokinin concentrations.
- Incubated samples in darkness for 20 hours, followed by 3.5 hours of light exposure.
Main Results:
- Successfully detected extremely low concentrations (0.0001 mg/L) of N(6)-benzyladenine, zeatin, kinetin, and zeatin riboside.
- Kinetin demonstrated the least activity among the tested cytokinins.
- The modified assay exhibited a tenfold increase in sensitivity compared to the original method.
Conclusions:
- The enhanced cucumber cotyledon greening bioassay offers superior sensitivity for cytokinin detection.
- This improved method allows for the identification of trace amounts of key plant hormones.
- The assay is valuable for plant science research requiring precise hormone quantification.