Abstract
During steady-state photosynthesis in low-light, 830-nm absorption (A830) by leaves was close to that in darkness in Arabidopsis, indicating that the primary donor P700 in the reaction center of photosystem I (PSI) was in reduced form. However, P700 was not fully oxidized by a saturating light pulse, suggesting the presence of a population of PSI centers with reduced P700 that remains thermodynamically stable during the application of the saturating light pulse (i.e., reduced-inactive P700). To substantiate this, the effects of methyl viologen (MV) and far-red light on P700 oxidation by the saturating light pulse were analyzed, and the cumulative effects of repetitive application of the saturating light pulse on photosynthesis were analyzed using a mutant crr2-2 with impaired PSI cyclic electron flow. We concluded that the reduced-inactive P700 in low-light as revealed by saturating light pulse indicates limitations of electron flow at the PSI acceptor side.
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Abbreviations
- A830 :
-
Leaf absorption at 830 nm
- Chl:
-
Chlorophyll
- Fm and Fm′:
-
Maximum fluorescence level in the dark- and light-adapted leaf, respectively
- Fs and Fo :
-
Steady state- and minimum-fluorescence level, respectively
- FR:
-
Far-red light
- MV:
-
Methyl viologen
- P700:
-
Primary donor pigment in the reaction center of PSI
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Acknowledgments
We thank Dr. Toshiharu Shikanai (Kyoto University) for helpful discussions and suggestions. This work was supported by a Grant-in-aid for Young Scientists B (18780117) from MEXT to Michito Tsuyama, for Young Scientists from Kyushu University to Michito Tsuyama, and for Scientific Research on Priority Areas (16085206) from MEXT to Toshiharu Shikanai.
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Tsuyama, M., Kobayashi, Y. Reduction of the primary donor P700 of photosystem I during steady-state photosynthesis under low light in Arabidopsis . Photosynth Res 99, 37–47 (2009). https://doi.org/10.1007/s11120-008-9379-x
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DOI: https://doi.org/10.1007/s11120-008-9379-x