Photosynthetica 2021, 59(4):600-605 | DOI: 10.32615/ps.2021.051

Photoprotective roles of ascorbate and PSII cyclic electron flow in the response of the seagrass Zostera marina to oxygen-evolving complex photoinactivation

W. ZHAO, Q.S. ZHANG, Y. TAN, Z. LIU, M.Y. MA, M.X. WANG, C.Y. LUO
Ocean School, Yantai University, 264005 Yantai, China

The oxygen-evolving complex (OEC) of Zostera marina is prone to deactivation under visible light, which results in a formation of the long-lived radical P680+. The mechanism to prevent damage caused by P680+ remains unclear. In this study, following light exposure, the upregulation in ascorbate (AsA) content and the presence of PSII cyclic electron flow (PSII-CEF) provide evidence that AsA and PSII-CEF donate electrons to PSII. Furthermore, a factorial design experiment with different combinations of inhibition of AsA and PSII-CEF demonstrates that both inhibition treatments lead to decreases in maximal photochemical yield of PSII, increases in relative variable fluorescence at the K-step, as well as the net loss of PSII reaction center proteins and further degradation of OEC peripheral proteins. These results suggest that AsA and PSII-CEF play photoprotective roles by providing electrons to efficiently prevent damage to PSII from the highly oxidizing radical P680+ in Z. marina.

Additional key words: alternative electron donor; ascorbate; cstylePSII cyclic electron flow; cstyle

Received: July 4, 2021; Revised: October 4, 2021; Accepted: October 27, 2021; Prepublished online: November 18, 2021; Published: December 17, 2021  Show citation

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ZHAO, W., ZHANG, Q.S., TAN, Y., LIU, Z., MA, M.Y., WANG, M.X., & LUO, C.Y. (2021). Photoprotective roles of ascorbate and PSII cyclic electron flow in the response of the seagrass Zostera marina to oxygen-evolving complex photoinactivation. Photosynthetica59(4), 600-605. doi: 10.32615/ps.2021.051
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