Cyclic electron transport around photosystem I has been proposed to play dual roles in the regulation of photosynthetic electron transport: down-regulating PS II and adjusting the ATP/NADPH ratio. Recent molecular genetics revealed that cyclic electron flow is essential for normal photosynthesis and growth. The water-water-cycle would also play a role similar to cyclic electron transport, in addition to the effective scavenging of reactive oxygen species generated in PS I. Though their rates of electron flux are lower than that of linear electron transport at steady state, these alternative electron flows are indispensable for acute responses to environmental changes and stress. Recent biochemical and molecular studies at the protein and gene level have clarified the components participating in the alternative electron transport. These new findings, including the dual functions of cyclic electron flow and the water-water cycle, and their respective roles in stress responses, are discussed in this chapter.
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Endo, T., Asada, K. (2008). Photosystem I and Photoprotection: Cyclic Electron Flow and Water-Water Cycle. In: Demmig-Adams, B., Adams, W.W., Mattoo, A.K. (eds) Photoprotection, Photoinhibition, Gene Regulation, and Environment. Advances in Photosynthesis and Respiration, vol 21. Springer, Dordrecht. https://doi.org/10.1007/1-4020-3579-9_14
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