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

Title:

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

Creator:

Zhao, W., Zhang, Q.S., Tan, Y., Liu, Z., Ma, M.Y., Wang, M.X., and Luo, C.Y.

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:2023d101-0bef-4bd1-abdf-bc89a9359a24
uuid:2023d101-0bef-4bd1-abdf-bc89a9359a24
doi:10.32615/ps.2021.051

Subject:

alternative electron donor, ascorbate, cstylePSII cyclic electron flow, and cstyle

Type:

model:article and TEXT

Format:

počítač and online zdroj

Description:

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.

Language:

Multiple languages

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Coverage:

600-605

Source:

Photosynthetica | 2021 Volume:59 | Number:4

Harvested from:

CDK

Metadata only:

false