PMID: 11333308May 3, 2001Paper

Physiological significance of the regulation of photosystem stoichiometry upon high light acclimation of Synechocystis sp. PCC 6803

Plant & Cell Physiology
Kintake SonoikeMasahiko Ikeuchi

Abstract

We characterized the photosynthetic properties of the pmgA mutant of Synechocystis PCC 6803, which cannot change its photosystem stoichiometry under a high-light condition (200 micromol x m(-2) x s(-1)), in order to clarify the physiological significance of the regulation of photosystem stoichiometry. We found that (1) PSII activity was inhibited more in wild-type cells on the first day under the high-light conditions than in mutant cells. (2) The growth of the mutants following the initial imposition of high light was faster than that of wild-type cells. (3) However, growth was severely inhibited in the mutants after the third day of exposure to high light. (4) The growth inhibition in the mutants under the extended high-light conditions was reversed by the addition of sublethal concentrations of 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU), which seemed to mimic photoinhibition of PSII. These results suggest that the main role of adjusting the photosystem stoichiometry with respect to light intensity is not to maintain efficient photosynthesis, but to down regulate electron transfer. Failure to down regulate electron flow leads to cell death under prolonged exposure to high light in this cyanobacterium.

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Citations

Oct 19, 2011·Journal of Plant Research·Masayuki Muramatsu, Yukako Hihara
Jun 6, 2007·Plant & Cell Physiology·Hirotaka ChidaTadatake Oku
Oct 7, 2004·Plant Physiology·Tyler D B MackenzieDouglas A Campbell
Aug 15, 2013·The Plant Journal : for Cell and Molecular Biology·Takashi OsanaiMasami Yokota Hirai
Dec 7, 2010·Physiologia Plantarum·Kintake Sonoike
Jan 9, 2008·Toxicology in Vitro : an International Journal Published in Association with BIBRA·R S MacedoL R Rörig
Feb 28, 2015·Journal of Photochemistry and Photobiology. B, Biology·Takako Ogawa, Kintake Sonoike
May 18, 2006·Plant & Cell Physiology·Masayuki Muramatsu, Yukako Hihara
Nov 4, 2006·Plant & Cell Physiology·Hideyuki TakahashiHirofumi Uchimiya
Jul 16, 2019·Biochimica Et Biophysica Acta. Bioenergetics·Noam AdirDvir Harris

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