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Responses of the photosynthetic electron transport system to excess light energy caused by water deficit in wild watermelon
- Source :
- Physiologia plantarum. 142(3)
- Publication Year :
- 2011
-
Abstract
- In plants, drought stress coupled with high levels of illumination causes not only dehydration of tissues, but also oxidative damage resulting from excess absorbed light energy. In this study, we analyzed the regulation of electron transport under drought/high-light stress conditions in wild watermelon, a xerophyte that shows strong resistance to this type of stress. Under drought/high-light conditions that completely suppressed CO(2) fixation, the linear electron flow was diminished between photosystem (PS) II and PS I, there was no photoinhibitory damage to PS II and PS I and no decrease in the abundance of the two PSs. Proteome analyses revealed changes in the abundance of protein spots representing the Rieske-type iron-sulfur protein (ISP) and I and K subunits of NAD(P)H dehydrogenase in response to drought stress. Two-dimensional electrophoresis and immunoblot analyses revealed new ISP protein spots with more acidic isoelectric points in plants under drought stress. Our findings suggest that the modified ISPs depress the linear electron transport activity under stress conditions to protect PS I from photoinhibition. The qualitative changes in photosynthetic proteins may switch the photosynthetic electron transport from normal photosynthesis mode to stress-tolerance mode.
- Subjects :
- Iron-Sulfur Proteins
Photoinhibition
Light
Physiology
Molecular Sequence Data
Dehydrogenase
Plant Science
Biology
Photosynthesis
Thylakoids
Citrullus
Electron Transport
Soil
Stress, Physiological
Genetics
medicine
Electrophoresis, Gel, Two-Dimensional
Dehydration
Amino Acid Sequence
Photosystem
Plant Proteins
food and beverages
Membrane Proteins
Water
Cell Biology
General Medicine
medicine.disease
Electron transport chain
Droughts
Plant Leaves
Kinetics
Isoelectric point
Biochemistry
Solubility
NAD+ kinase
Sequence Alignment
Subjects
Details
- ISSN :
- 13993054
- Volume :
- 142
- Issue :
- 3
- Database :
- OpenAIRE
- Journal :
- Physiologia plantarum
- Accession number :
- edsair.doi.dedup.....30d75a56fc7fc6a6fa71647ae87cfb56