Abstract
Plants convert light energy from the sun into chemical energy by photosynthesis. Since they are sessile, they have to deal with a wide range of conditions in their immediate environment. Many abiotic and biotic parameters exhibit considerable fluctuations which can have detrimental effects especially on the efficiency of photosynthetic light harvesting. During evolution, plants, therefore, evolved a number of acclimation processes which help them to adapt photosynthesis to such environmental changes. This includes protective mechanisms such as excess energy dissipation and processes supporting energy redistribution, e.g. state transitions or photosystem stoichiometry adjustment. Intriguingly, all these responses are triggered by photosynthesis itself via the interplay of its light reaction and the Calvin–Benson cycle with the residing environmental condition. Thus, besides its primary function in harnessing and converting light energy, photosynthesis acts as a sensing system for environmental changes that controls molecular acclimation responses which adapt the photosynthetic function to the environmental change. Important signalling parameters directly or indirectly affected by the environment are the pH gradient across the thylakoid membrane and the redox states of components of the photosynthetic electron transport chain and/or electron end acceptors coupled to it. Recent advances demonstrate that these signals control post-translational modifications of the photosynthetic protein complexes and also affect plastid and nuclear gene expression machineries as well as metabolic pathways providing a regulatory framework for an integrated response of the plant to the environment at all cellular levels.
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Abbreviations
- Chl:
-
Chlorophyll
- CP:
-
Chloroplast
- CSK:
-
Chloroplast sensor kinase
- Cyt b 6 f :
-
Cytochrome b 6 f complex
- FTR:
-
Ferredoxin–thioredoxin oxidoreductase
- LHC:
-
Light-harvesting systems
- LHCIIb:
-
The major light-harvesting chlorophyll a/b complexes of photosystem II
- LTR:
-
Long-term response
- PAR:
-
Photosynthetic active radiation
- PEP:
-
Plastid encoded RNA polymerase
- P-LHCIIb:
-
Phosphorylated LHCIIb
- PQ:
-
Plastoquinone
- PS:
-
Photosystem
- PTK:
-
Plastid transcription kinase
- RC:
-
Reaction centre
- RubisCO:
-
Ribulose-1,5-bisphosphate carboxylase/oxygenase
- SIG1:
-
Sigma factor 1
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Work in the laboratories of the authors is supported by grants from the Deutsche Forschungsgemeinschaft (DFG), the Chinese Academy of Science and the National Natural Science Foundation of China (NSFC).
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Pfannschmidt, T., Yang, C. The hidden function of photosynthesis: a sensing system for environmental conditions that regulates plant acclimation responses. Protoplasma 249 (Suppl 2), 125–136 (2012). https://doi.org/10.1007/s00709-012-0398-2
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DOI: https://doi.org/10.1007/s00709-012-0398-2