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Instrumentation and methodology for quantifying GFP fluorescence in intact plant organs
R J Millwood1, M D Halfhill, D Harkins
1UNC Greensboro, NC, USA.
Biotechniques
|March 29, 2003
Summary
The portable General Fluorescence Plant Meter (GFP-Meter) enables rapid, non-damaging protein fluorescence measurements in plants. While accurate initially, its long-term measurements are best for qualitative analysis.
Area of Science:
- Plant biology
- Biophysics
- Spectroscopy
Background:
- Traditional protein fluorescence measurement methods are often lab-based and can be destructive.
- There is a need for rapid, field-deployable instruments for plant protein analysis.
Purpose of the Study:
- To introduce and validate the General Fluorescence Plant Meter (GFP-Meter) for field-based protein fluorescence measurements.
- To assess the accuracy and effectiveness of the GFP-Meter compared to laboratory standards.
Main Methods:
- The GFP-Meter, a portable spectrofluorometer, was used with a leaf clip to collect spectrofluorescence data from tobacco and canola plants expressing GFP.
- Measurements were compared to those from a FluoroMax-2 laboratory spectrofluorometer using simple linear regression.
- A time-course analysis was conducted to evaluate measurement accuracy over time.
Main Results:
- A positive functional relationship was found between GFP-Meter and FluoroMax-2 measurements.
- The GFP-Meter demonstrated accuracy in initial measurements.
- Subsequent measurements over time were found to be suitable for qualitative assessments.
Conclusions:
- The GFP-Meter is an effective tool for rapid, non-destructive, and accurate initial fluorescence measurements of plant proteins in the field.
- While initial quantitative data is reliable, long-term data is best utilized for qualitative observations.
