High salt-induced PSI-supercomplex is associated with high CEF and attenuation of state transitions.

IF 2.9 3区 生物学 Q2 PLANT SCIENCES
Photosynthesis Research Pub Date : 2023-09-01 Epub Date: 2023-06-22 DOI:10.1007/s11120-023-01032-y
Isha Kalra, Xin Wang, Ru Zhang, Rachael Morgan-Kiss
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引用次数: 0

Abstract

While PSI-driven cyclic electron flow (CEF) and assembly of thylakoid supercomplexes have been described in model organisms like Chlamydomonas reinhardtii, open questions remain regarding their contributions to survival under long-term stress. The Antarctic halophyte, C. priscuii UWO241 (UWO241), possesses constitutive high CEF rates and a stable PSI-supercomplex as a consequence of adaptation to permanent low temperatures and high salinity. To understand whether CEF represents a broader acclimation strategy to short- and long-term stress, we compared high salt acclimation between the halotolerant UWO241, the salt-sensitive model, C. reinhardtii, and a moderately halotolerant Antarctic green alga, C. sp. ICE-MDV (ICE-MDV). CEF was activated under high salt and associated with increased non-photochemical quenching in all three Chlamydomonas species. Furthermore, high salt-acclimated cells of either strain formed a PSI-supercomplex, while state transition capacity was attenuated. How the CEF-associated PSI-supercomplex interferes with state transition response is not yet known. We present a model for interaction between PSI-supercomplex formation, state transitions, and the important role of CEF for survival during long-term exposure to high salt.

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高盐诱导的PSI超复杂度与高CEF和状态转变的衰减有关。
尽管PSI驱动的循环电子流(CEF)和类囊体超复合体的组装已经在莱茵衣藻等模式生物中进行了描述,但它们对长期应激下生存的贡献仍然存在悬而未决的问题。南极盐生植物C.priscuii UWO241(UWO241)由于适应永久低温和高盐度,具有组成性的高CEF率和稳定的PSI超复合体。为了了解CEF是否代表了对短期和长期胁迫的更广泛的驯化策略,我们比较了耐盐UWO241、盐敏模型C.reinhardtii和中等耐盐南极绿藻C.sp.ICE-MDV(ICE-MDV)之间的高盐驯化。CEF在高盐条件下被激活,并与所有三种衣藻的非光化学猝灭增加有关。此外,任一菌株的高盐驯化细胞形成PSI超复合体,而状态转换能力减弱。与CEF相关的PSI超复数如何干扰状态转换响应尚不清楚。我们提出了一个PSI超复合体形成、状态转变和CEF在长期暴露于高盐环境中对生存的重要作用之间相互作用的模型。
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来源期刊
Photosynthesis Research
Photosynthesis Research 生物-植物科学
CiteScore
6.90
自引率
8.10%
发文量
91
审稿时长
4.5 months
期刊介绍: Photosynthesis Research is an international journal open to papers of merit dealing with both basic and applied aspects of photosynthesis. It covers all aspects of photosynthesis research, including, but not limited to, light absorption and emission, excitation energy transfer, primary photochemistry, model systems, membrane components, protein complexes, electron transport, photophosphorylation, carbon assimilation, regulatory phenomena, molecular biology, environmental and ecological aspects, photorespiration, and bacterial and algal photosynthesis.
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