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• W4291796127 abstract "Abstract While light is the driving force of photosynthesis, excessive light can be harmful. Photoinhibition, or light-induced photo-damage, is one of the key processes limiting photosynthesis. When the absorbed light exceeds the amount that can be dissipated by photosynthetic electron flow and other processes, damaging radicals are formed that mostly inactivate photosystem II (PSII). A well-defined mechanism that protects the photosynthetic apparatus from photoinhibition has been described in the model green alga Chlamydomonas reinhardtii and plants. Chlorella oha-dii is a green micro-alga, isolated from biological desert soil crusts, that thrives under extreme high light (HL) in which other organisms do not survive. Here, we show that this alga evolved unique protection mechanisms distinct from those of C. reinhardtii and plants. When grown under extreme HL, significant structural changes were noted in the C. ohadii thylakoids, including a drastic reduction in the antennae and the formation of stripped core PSII, lacking its outer and inner antennae. This is accompanied by a massive accumulation of protective carotenoids and proteins that scavenge harmful radicals. At the same time, several elements central to photoinhibition protection in C. reinhardtii , such as psbS, the stress-related light harvesting complex, PSII protein phosphorylation and state-transitions are entirely absent or were barely detected in C. ohadii . Taken together, a unique photoinhibition protection mechanism evolved in C. ohadii , enabling the species to thrive under extreme-light intensities where other photo-synthetic organisms fail to survive." @default.
• W4291796127 created "2022-08-16" @default.
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• W4291796127 date "2022-08-15" @default.
• W4291796127 modified "2023-09-27" @default.
• W4291796127 title "A desert green alga that thrives at extreme high-light intensities using a unique photoin-hibition protection mechanism" @default.
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• W4291796127 doi "https://doi.org/10.1101/2022.08.14.503881" @default.
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