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- W2149025034 abstract "Chilling-induced photoinhibition and subsequent recovery was studied in Arabidopsis thaliana exposed to 4°C and 150 µmol photons m–2 s–1. PSII showed progressive damage with a 14% decrease in quantum yield after 8 h exposure. In contrast, the damage to PSI leveled off after 8 h with a decrease in in vitro NADP+ photoreduction activity of around 32%. In vivo P700 measurements demonstrated that antenna efficiency was decreased by the photoinhibitory treatment. Measurements of P700 and immunoblotting demonstrated that the damaged PSI was not degraded during the 8 h light-chilling treatment, but after 12 h recovery at 20°C, no damaged PSI remained in the thylakoids. Thus, degradation of damaged PSI is a step in the recovery and not a direct result of photodamage. Unlike photodamaged PSII, the PSI core complex is not repaired but completely degraded. In contrast, light harvesting complex I proteins have a slow turnover. PSII recovered completely within 8 h after transfer to 20°C whereas PSI activity recovered very slowly, and the amount of PSI on a leaf area basis remained low even after 1 week at 20°C. The results show that damage, protein turnover and recovery are well separated processes in Arabidopsis." @default.
- W2149025034 created "2016-06-24" @default.
- W2149025034 creator A5019344762 @default.
- W2149025034 creator A5076583784 @default.
- W2149025034 date "2004-11-15" @default.
- W2149025034 modified "2023-10-14" @default.
- W2149025034 title "Photoinhibition of Photosystem I at Chilling Temperature and Subsequent Recovery in Arabidopsis thaliana" @default.
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- W2149025034 doi "https://doi.org/10.1093/pcp/pch180" @default.
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