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Use ofLemna minor L. as a bioassay in allelopathy
F A Einhellig1, G R Leather, L L Hobbs
1Department of Biology, University of South Dakota, 57069, Vermillion, South Dakota.
Journal of Chemical Ecology
|December 7, 2013
Summary
A new bioassay effectively measures the growth-regulating effects of allelochemicals using small amounts of plant compounds. This sensitive method aids in identifying potential growth inhibitors from natural sources.
Area of Science:
- Plant Science
- Biochemistry
- Ecology
Background:
- Allelopathy research often requires sensitive bioassays to evaluate plant growth regulators.
- Limited quantities of potentially active compounds necessitate efficient detection methods.
Purpose of the Study:
- To develop a sensitive and reproducible bioassay for evaluating allelochemicals.
- To assess the efficacy of the bioassay for detecting growth inhibition by various compounds.
Main Methods:
- Utilized *Lemna minor* (duckweed) in 1.5-ml nutrient medium within 24-well tissue culture plates.
- Tested flavonoid compounds and derivatives of coumarin, benzoic acid, and cinnamic acid.
- Evaluated effects after 7 days by measuring frond number, growth rate, and dry weight.
Main Results:
- The bioassay detected inhibition from 50 to 1000 μmol of tested compounds.
- Strong inhibitory effects were observable within 1-2 days.
- The system demonstrated sensitivity, reproducibility, and suitability for dilute samples.
Conclusions:
- A simple, sensitive, and reproducible bioassay for allelochemicals was successfully developed.
- This method is effective for analyzing small quantities and dilute concentrations of plant growth regulators.
- The bioassay is valuable for screening unknowns separated by chromatography in allelopathy studies.
