PMID: 11607488Jul 19, 1994Paper

Photosystem II reaction center damage and repair cycle: chloroplast acclimation strategy to irradiance stress

Proceedings of the National Academy of Sciences of the United States of America
C Vasilikiotis, A Melis

Abstract

A daily occurrence in the life of a plant is the function of a photosystem II (PSII) damage and repair cycle in chloroplasts. This unique phenomenon involves the frequent turnover of D1, the 32-kDa reaction-center protein of PSII (chloroplast psbA gene product). In the model organism Dunaliella salina (a green alga), growth under low light (100 mol of photons per m2 per sec) entails damage, degradation, and replacement of D1 every 7 hr. Growth under irradiance stress (2200 micromol of photons per m2 per sec) entails damage to D1 every 20 min. The rate of de novo D1 biosynthesis under conditions of both low light and irradiance stress was found to be fairly constant on a per chloroplast or cell basis. The response of D. salina to the enhanced rate of damage entails an accumulation of photodamaged centers (80% of all PSII) and the formation of thylakoid membranes containing a smaller quantity of photosystem I (PSI) centers (about 10% of that in cells grown under low light). These changes contribute to a shift in the PSII/PSI ratio from 1.4:1 under low-light conditions to 15:1 under irradiance stress. The accumulation of photodamaged PSII under irradiance stress reflects a chloroplast inability to match the rate of D1 degradation ...Continue Reading

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Citations

Nov 25, 2005·Photosynthesis Research·Anastasios Melis, Hsu-Ching Chen
May 5, 2007·Photosynthesis Research·Aleel K Grennan, Donald R Ort
Feb 14, 2012·Journal of Theoretical Biology·Ioannis A PapadakisKonstadia Lika
Dec 9, 2014·Plant Signaling & Behavior·Dinesh GuptaChhandak Basu
Dec 8, 2004·Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology·I YakovlevaM Hidaka
Jun 11, 2010·Chemistry & Biology·Iain McConnellGary W Brudvig
Apr 20, 2006·Photochemistry and Photobiology·Josée Nina BouchardDouglas A Campbell
Nov 25, 2005·Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology·Kittisak YokthongwattanaAnastasios Melis
Oct 7, 2004·Plant Physiology·Tyler D B MackenzieDouglas A Campbell

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