Abstract
Under a moderately heat-stressed condition, the photosystems of higher plants are damaged in the dark more easily than they are in the presence of light. To obtain a better understanding of this heat-derived damage mechanism that occurs in the dark, we focused on the involvement of the light-independent electron flow that occurs at 40 °C during the damage. In various plant species, the maximal photochemical quantum yield of photosystem (PS) II (F v/F m) decreased as a result of heat treatment in the dark. In the case of wheat, the most sensitive plant species tested, both F v/F m and oxygen evolution rapidly decreased by heat treatment at 40 °C for 30 min in the dark. In the damage, specific degradation of D1 protein was involved, as shown by immunochemical analysis of major proteins in the photosystem. Because light canceled the damage to PSII, the light-driven electron flow may play a protective role against PSII damage without light. Light-independent incorporation of reducing power from stroma was enhanced at 40 °C but not below 35 °C. Arabidopsis mutants that have a deficit of enzymes which mediate the incorporation of stromal reducing power into thylakoid membranes were tolerant against heat treatment at 40 °C in the dark, suggesting that the reduction of the plastoquinone pool may be involved in the damage. In conclusion, the enhanced introduction of reducing power from stroma into thylakoid membranes that occurs around 40 °C causes over-reduction of plastoquinone, resulting in the damage to D1 protein under heat stress without linear electron flow.
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Abbreviations
- CBB:
-
Coomassie Brilliant Blue
- CEF:
-
Cyclic electron flow
- Fd:
-
Ferredoxin
- FNR:
-
Fd-NADPH reductase
- F v/F m :
-
Maximal photochemical quantum yield of photosystem II
- NDH:
-
NAD(P)H dehydrogenase
- NPQ:
-
Non-photochemical quenching
- OEC:
-
Oxygen-evolution complex
- OEC33:
-
OEC 33 kDa protein
- PQ:
-
Plastoquinone
- PS:
-
Photosystem
- ROS:
-
Reactive oxygen species
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Acknowledgments
This study was supported by a Grant-in-Aid for Exploratory Research (Y.Y., 21658112) and Grant-in-Aid for Scientific Research (Y.Y., 23580456) from the Ministry of Education, Culture, Sports, Science and Technology, Japan.
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The authors Y. Marutani and Y. Yamauchi contributed equally to this work.
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Marutani, Y., Yamauchi, Y., Kimura, Y. et al. Damage to photosystem II due to heat stress without light-driven electron flow: involvement of enhanced introduction of reducing power into thylakoid membranes. Planta 236, 753–761 (2012). https://doi.org/10.1007/s00425-012-1647-5
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DOI: https://doi.org/10.1007/s00425-012-1647-5