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Using spontaneous photon emission to image lipid oxidation patterns in plant tissues
Simona Birtic1, Brigitte Ksas, Bernard Genty
1CEA, DSV, IBEB, Laboratoire d'Ecophysiologie Moléculaire des Plantes, F-13108 Saint-Paul-lez-Durance, France.
The Plant Journal : for Cell and Molecular Biology
|May 21, 2011
Summary
Plants emit light through autoluminescence, a phenomenon enhanced by stress. This study reveals that oxidized lipids are the primary source of this light, offering a new way to visualize plant lipid oxidation non-invasively.
Area of Science:
- Plant biology
- Biophotonics
- Biochemistry
Background:
- Plants and other organisms emit visible light (autoluminescence).
- Oxidative stress and wounding increase plant autoluminescence.
- The precise origin of this long-lived plant autoluminescence remains unclear.
Purpose of the Study:
- To investigate the origin of enhanced plant autoluminescence.
- To determine if oxidized lipids contribute to plant autoluminescence.
- To establish a method for visualizing lipid oxidation in plants.
Main Methods:
- Imaging plant autoluminescence using a sensitive charge-coupled device camera.
- Comparing plant autoluminescence with in vitro luminescence of oxidized lipids, DNA, and proteins.
- Utilizing Arabidopsis mutants with altered lipid metabolism.
- Analyzing emission spectra and temperature/time dependence.
Main Results:
- Oxidized lipids exhibit persistent luminescence with similar characteristics to plant autoluminescence.
- DNA and proteins do not significantly contribute to the observed in vivo signal.
- A causal link between leaf autoluminescence and lipid oxidation was confirmed in Arabidopsis mutants.
- Chlorophyll enhances luminescence from oxidized lipids, and emission spectra align with oxidized lipids and chlorophyll interactions.
Conclusions:
- Spontaneous photon emission in plants primarily originates from oxidized lipids.
- Plant autoluminescence provides a sensitive, non-invasive method to map lipid oxidation patterns.
- This finding opens new avenues for plant stress monitoring and physiological studies.
