Abstract
Non-photochemical quenching (NPQ) of photosystem II (PSII) fluorescence is one of the most important protective mechanisms enabling the survival of phototropic organisms under high-light conditions. A low-efficiency NPQ, characterized by weak NPQ induction capacity and a low level of protective NPQ, was observed in the marine angiosperm Zostera marina, which inhabits the shallow water regions. Furthermore, chlorophyll fluorescence and Western blot analysis verified that the fast-inducted component of NPQ, i.e., the energy-dependent quenching (qE), was not present in this species. In contrast with the lack of PSII antenna quenching sites for qE induction in brown algae and the lack of functional XC in Ulvophyceae belonging to green algae, all the antenna proteins and the functional XC are present in Z. marina. A novel underlying mechanism was observed that the limited construction of the trans-thylakoid proton gradient (ΔpH) caused by photoinactivation of the oxygen evolving complex (OEC) did not induce protonation of PsbS, thus explaining the inability to form quenching sites for qE induction. Although the ΔpH established under light exposure activated violaxanthin (V) de-epoxidase enzyme to catalyze conversion of V via antheraxanthin (A) and then to zeaxanthin (Z), the quenching capacity of de-epoxidized pigment was weak in Z. marina. We suggest that the low-efficiency NPQ was conducive to efficiently utilize the limited electrons to perform photosynthesis, resisting the adverse effect of OEC photoinactivation on the photosynthetic rate.
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This work was supported by the National Natural Science Foundation of China (Grant No. 41376154) and the Yantai Municipal Key Research and Development Project (Grant No. 2019XDHZ096).
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WZ and QSZ conceived and designed the research, WZ, YT, and ZL conducted the experiments and the data analysis, WZ and QSZ wrote the manuscript. All authors discussed the results and commented on the manuscript.
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Zhao, W., Zhang, Q.S., Tan, Y. et al. An underlying mechanism of qE deficiency in marine angiosperm Zostera marina. Photosynth Res 148, 87–99 (2021). https://doi.org/10.1007/s11120-021-00836-0
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DOI: https://doi.org/10.1007/s11120-021-00836-0