Photoinactivation of the oxygen-evolving complex regulates the photosynthetic strategy of the seagrass Zostera marina

Zostera marina, a widespread seagrass, evolved from a freshwater ancestor of terrestrial monocots and successfully transitioned into a completely submerged seagrass. We found that its oxygen-evolving complex (OEC) was partially inactivated in response to light exposure, as evidenced by both the incr...

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Bibliographic Details
Published in:Journal of photochemistry and photobiology. B, Biology Biology, 2021-09, Vol.222, p.112259-112259, Article 112259
Main Authors: Zhao, Wei, Yang, Xiao-Qi, Zhang, Quan-Sheng, Tan, Ying, Liu, Zhe, Ma, Ming-Yu, Wang, Meng-Xin, Xu, Bin
Format: Article
Language:English
Subjects:
Alternative electron flows
Chemical synthesis
Energy dissipation
Evolution
Exponential functions
Exposure
Fluorescence
In vivo methods and tests
Malic acid
Oxygen
Oxygen-evolving complex
Photochemicals
Photoinactivation
Photorespiration
Photosynthesis
Proteins
Proteomes
Reactive oxygen species
Singlet oxygen
Terrestrial environments
Zostera marina
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Summary:Zostera marina, a widespread seagrass, evolved from a freshwater ancestor of terrestrial monocots and successfully transitioned into a completely submerged seagrass. We found that its oxygen-evolving complex (OEC) was partially inactivated in response to light exposure, as evidenced by both the increment of the relative variable fluorescence at the K-step and the downregulation of the OEC genes and proteins. This photosynthetic regulation was further addressed at both proteome and physiology levels by an in vivo study. The unchanged content of the ΔpH sensor PsbS protein and the non-photochemical quenching induction dynamics, described by a single exponential function, verified the absence of the fast qE component. Contents and activities of chlororespiration, Mehler reaction, malic acid synthesis, and photorespiration key enzymes were not upregulated, suggesting that alternative electron flows remained unactivated. Furthermore, neither significant production of singlet oxygen nor increment of total antioxidative capacity indicated that reactive oxygen species were not produced during light exposure. In summary, these low electron consumptions may allow Z. marina to efficiently use the limited electrons caused by partial OEC photoinactivation to maintain a normal carbon assimilation level. •Photoinactivation of the oxygen-evolving complex occurred in vivo in Zostera marina under visible light (400–750 nm).•The capacity of non-photochemical quenching was low.•Chlororespiration, Mehler reaction, malic acid synthesis, and photorespiration remained unactivated.•Reactive oxygen species were not produced.
ISSN:1011-1344
1873-2682
DOI:10.1016/j.jphotobiol.2021.112259