Abstract
Main conclusion
The photosystem-II (PSII) repair cycle is essential for the maintenance of photosynthesis in plants. A number of novel findings have illuminated the regulatory mechanisms of the PSII repair cycle.
Abstract
Photosystem II (PSII) is a large pigment–protein complex embedded in the thylakoid membrane. It plays a vital role in photosynthesis by absorbing light energy, splitting water, releasing molecular oxygen, and transferring electrons for plastoquinone reduction. However, PSII, especially the PsbA (D1) core subunit, is highly susceptible to oxidative damage. To prevent irreversible damage, plants have developed a repair cycle. The main objective of the PSII repair cycle is the degradation of photodamaged D1 and insertion of newly synthesized D1 into the PSII complex. While many factors are known to be involved in PSII repair, the exact mechanism is still under investigation. In this review, we discuss the primary steps of PSII repair, focusing on the proteolytic degradation of photodamaged D1 and the factors involved.
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This work was supported by the National Natural Science Foundation of China under Grant no. 32000197, and the China Postdoctoral Science Foundation under Grant no. 2019T120467.
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Su, J., Jiao, Q., Jia, T. et al. The photosystem-II repair cycle: updates and open questions. Planta 259, 20 (2024). https://doi.org/10.1007/s00425-023-04295-w
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DOI: https://doi.org/10.1007/s00425-023-04295-w