Summary
Photosynthetic organisms must respond to several external stimuli to adjust their photosynthetic performances in order to keep a high capacity of carbon assimilation and avoid photodamage. They do so integrating processes occurring at different time scales starting from very fast light harvesting, down to slow changes of electron flow and protein composition of the photosynthetic apparatus. Central to these regulatory mechanisms is the cytochrome b 6 f complex, which regulates intersystem electron flow via photosynthetic control and modulates light harvesting capacity by acting as a redox sensor to trigger an acclimation process named state transitions. In this chapter we describe how the cytochrome b 6 f complex performs to regulate these different functions in both plants and microalgae, proposing new mechanisms of regulation, and critically discussing how these processes are compatible with the existing literature on the structure and function of this complex.
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Abbreviations
- CBB:
-
Calvin Benson Bassham cycle
- CEF:
-
Cyclic electron flow
- Cyt:
-
b 6 f the cytochrome b 6 f complex
- Cyt:
-
Cytochrome
- Fd:
-
Ferredoxin
- FNR:
-
Ferredoxin-NADP+ oxidoreductase
- FQR:
-
Ferredoxin quinone reductase
- GAPDH:
-
Glyceraldehyde-3-phosphate dehydrogenase
- LEF:
-
Linear electron flow
- NDH:
-
NAD(P)H dehydrogenase
- NPQ:
-
Non Photochemical Quenching
- P700 :
-
Primary electron donor to PSI
- PC:
-
Plastocyanin
- PQ:
-
Plastoquinone
- PQH2 :
-
Plastoquinol
- PS:
-
Photosystem
- ROS:
-
Reactive oxygen species
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Acknowledgments
We would like to thank Dr. Cecile Breyton for her help in preparing Fig. 22.1. GF acknowledges the Marie Curie Initial Training Network Accliphot [FP7-PEPOPLE-2012-ITN, grant agreement number 316427], the French National Agency “DiaDomOil” [ANR-NT09_567009], a grant from the region Rhone Alpes and the Centre National de la Recherche Scientifique program “Defi PF-ENRS13-1 Milli_Oil”. JM was supported by JSPS and NEDO through KAKENHI (26251033) and a project for the strategic development of next-generation bioenergy utilization technology (P07015). GNJ acknowledges support from the UK Biotechnology and Biological Sciences Research Council (BB/C508877/1) and the Royal Society (ref: 24718)
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Finazzi, G., Minagawa, J., Johnson, G.N. (2016). The Cytochrome b 6 f Complex: A Regulatory Hub Controlling Electron Flow and the Dynamics of Photosynthesis?. In: Cramer, W., Kallas, T. (eds) Cytochrome Complexes: Evolution, Structures, Energy Transduction, and Signaling. Advances in Photosynthesis and Respiration, vol 41. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-7481-9_22
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