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Measuring redox changes in vivo in leaves: prospects and technical challenges
Philip M Mullineaux1, Tracy Lawson
1Department of Biological Sciences, University of Essex, Colchester, Essex, UK.
Methods in Molecular Biology (Clifton, N.J.)
|January 23, 2009
Summary
Scientists developed a new tool to measure the glutathione redox state in plants in real-time. This reporter protein, roGFP1-12, allows for spatial and temporal monitoring of oxidative stress in plant cells.
Area of Science:
- Plant Biology
- Biochemistry
- Molecular Biology
Background:
- Protein function in plant leaves under oxidative stress relies on the glutathione redox state.
- Current methods for measuring glutathione are destructive, labor-intensive, and underestimate redox state.
- A need exists for in vivo tools to measure glutathione redox state spatially and temporally.
Purpose of the Study:
- To highlight the potential of redox-sensitive green fluorescent proteins (roGFPs) as real-time redox reporters in intact plants.
- To assess the practical application of roGFPs in different leaf cell types under environmental change.
- To identify an optimal roGFP variant for plant redox monitoring.
Main Methods:
- Utilizing redox-sensitive green fluorescent proteins (roGFPs) as bioindicators.
- Evaluating different GFP variants for their suitability in plant leaves.
- Focusing on roGFP1-12 due to its specific advantageous characteristics.
- Considering the use of cell-specific promoters for targeted compartment analysis.
Main Results:
- roGFPs offer a non-destructive, real-time method for assessing glutathione redox state in vivo.
- roGFP1-12 exhibits dual excitation peaks for ratiometric analysis, pH/halide insensitivity, and rapid response times.
- roGFP1-12 has suitable emission wavelengths for effective use in plant leaves.
- Specific cell promoters can target roGFP1-12 to distinct cellular compartments and tissues.
Conclusions:
- roGFP1-12 is an ideal candidate for developing a whole-plant redox reporter system.
- Targeted expression of roGFP1-12 allows monitoring of glutathione redox state changes in specific cellular compartments.
- This tool can determine the effects of reactive oxygen species on cellular components in real-time.
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