A pigment-binding protein essential for regulation of photosynthetic light harvesting

Nature
X P LiK K Niyogi

Abstract

Photosynthetic light harvesting in plants is regulated in response to changes in incident light intensity. Absorption of light that exceeds a plant's capacity for fixation of CO2 results in thermal dissipation of excitation energy in the pigment antenna of photosystem II by a poorly understood mechanism. This regulatory process, termed nonphotochemical quenching, maintains the balance between dissipation and utilization of light energy to minimize generation of oxidizing molecules, thereby protecting the plant against photo-oxidative damage. To identify specific proteins that are involved in nonphotochemical quenching, we have isolated mutants of Arabidopsis thaliana that cannot dissipate excess absorbed light energy. Here we show that the gene encoding PsbS, an intrinsic chlorophyll-binding protein of photosystem II, is necessary for nonphotochemical quenching but not for efficient light harvesting and photosynthesis. These results indicate that PsbS may be the site for nonphotochemical quenching, a finding that has implications for the functional evolution of pigment-binding proteins.

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Citations

Mar 16, 2013·Extremophiles : Life Under Extreme Conditions·Shanli MouMeiling An
Aug 10, 2006·Plant Molecular Biology·Mikko TikkanenAro Eva-Mari
Sep 10, 2005·Photosynthesis Research·Alexander RubanAnne-Lise Etienne
Sep 7, 2005·Photosynthesis Research·Jun Minagawa, Yuichiro Takahashi
Jul 29, 2005·Photosynthesis Research·Esa TyystjärviPäivi Sarvikas
Jul 29, 2005·Photosynthesis Research·Hanna-Leena BreitholtzEevi Rintamäki
Jun 7, 2006·Photosynthesis Research·Giorgio FortiGiuseppe Zucchelli
Oct 4, 2007·Photosynthesis Research·Galyna KufrykChristiane Funk
Sep 30, 2008·Photosynthesis Research·Alexander G IvanovNorman P A Huner
Jan 8, 2010·Photosynthesis Research·Doron EisenstadtAaron Kaplan
Mar 13, 2010·Photosynthesis Research·Reimund Goss, Torsten Jakob
Jul 3, 2010·Photosynthesis Research·Jonathan A D Neilson, Dion G Durnford
Aug 24, 2010·Photosynthesis Research·Marius C CodreaEsa Tyystjärvi
Aug 25, 2010·Photosynthesis Research·Martine Bertrand
Feb 9, 2011·Photosynthesis Research·Nikolaos E IoannidisKiriakos Kotzabasis
Feb 18, 2011·Photosynthesis Research·Bernard LepetitChristian Wilhelm
Jul 10, 2012·Photosynthesis Research·José Ignacio García-PlazaolaAlbert Porcar-Castell

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