Abstract
Light and temperature affect state transitions through changes in the plastoquinone (PQ) redox state in photosynthetic organisms. We demonstrated that light and/or heat treatment induced preferential photosystem (PS) I excitation by binding light-harvesting complex II (LHCII) proteins. The photosystem of wheat was in state 1 after dark overnight treatment, wherein PQ was oxidized and most of LHCII was not bound to PSI. At the onset of the light treatment [25 °C in the light (100 µmol photons m−2 s−1)], two major LHCIIs, Lhcb1 and Lhcb2 were phosphorylated, and the PSI–LHCII supercomplex formed within 5 min, which coincided with an increase in the PQ oxidation rate. Heat treatment at 40 °C of light-adapted wheat led to further LHCII protein phosphorylation of, resultant cyclic electron flow promotion, which was accompanied by ultrafast excitation of PSI and structural changes of thylakoid membranes, thereby protecting PSII from heat damage. These results suggest that LHCIIs are required for the functionality of wheat plant PSI, as it keeps PQ oxidized by regulating photochemical electron flow, thereby helping acclimation to environmental changes.
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Abbreviations
- α-DM:
-
n-dodecyl-α-d-maltoside
- AL:
-
Actinic light
- BL:
-
Blue light
- BN-PAGE:
-
Blue native-polyacrylamide gel electrophoresis
- CEF:
-
Cyclic electron flow
- ETR:
-
Photosynthetic electron transport rate
- FR:
-
Far-red light
- LEF:
-
Linear electron flow
- LHCII:
-
Light-harvesting complex II
- NPQ:
-
Nonphotochemical quenching
- φII:
-
Photosystem II quantum efficiency
- PQ:
-
Plastoquinone
- PS:
-
Photosystem
- STN:
-
Ser–Thr kinase
- TEM:
-
Transmission electron microscopy
- TRFS:
-
Time-resolved fluorescence spectra
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Acknowledgments
This work was supported by Grant-in-Aids for Scientific Research (Y. Y., 23580456) from the Ministry of Education, Culture, Sports, Science and Technology, Japan, and JSPS Research Fellowship for Young Scientists (Y. M., 251843).
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Marutani, Y., Yamauchi, Y., Higashiyama, M. et al. Essential role of the PSI–LHCII supercomplex in photosystem acclimation to light and/or heat conditions by state transitions. Photosynth Res 131, 41–50 (2017). https://doi.org/10.1007/s11120-016-0295-1
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DOI: https://doi.org/10.1007/s11120-016-0295-1
Keywords
- Heat stress
- Photosynthetic electron flow
- Photosystem
- Protein phosphorylation
- State transition
- Thylakoid membrane
- Wheat