Toward an understanding of the mechanism of nonphotochemical quenching in green plants

Biochemistry
Nancy E HoltKrishna K Niyogi

Abstract

Oxygenic photosynthesis in plants involves highly reactive intermediates and byproducts that can damage the photosynthetic apparatus and other chloroplast constituents. The potential for damage is exacerbated when the amount of absorbed light exceeds the capacity for light energy utilization in photosynthesis, a condition that can lead to decreases in photosynthetic efficiency. A feedback de-excitation mechanism (qE), measured as a component of nonphotochemical quenching of chlorophyll fluorescence, regulates photosynthetic light harvesting in excess light in response to a change in thylakoid lumen pH. qE involves de-excitation of the singlet excited state of chlorophyll in the light-harvesting antenna of photosystem II, thereby minimizing the deleterious effects of high light via thermal dissipation of excess excitation energy. While the physiological importance of qE has been recognized for many years, a description of its physical mechanism remains elusive. We summarize recent biochemical and spectroscopic results that have brought us closer to the goal of a mechanistic understanding of this fundamental photosynthetic regulatory process.

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Citations

May 5, 2007·Photosynthesis Research·Aleel K Grennan, Donald R Ort
Apr 17, 2008·Photosynthesis Research·Raymond J Ritchie
Sep 10, 2008·Photosynthesis Research·Anja Krieger-LiszkayAchim Trebst
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Mar 1, 2012·Physical Chemistry Chemical Physics : PCCP·Daniel B TurnerGregory D Scholes
Apr 23, 2010·Proceedings of the National Academy of Sciences of the United States of America·Arren Bar-EvenRon Milo
Mar 20, 2013·Proceedings of the National Academy of Sciences of the United States of America·Laura WilkWerner Kühlbrandt
Nov 3, 2010·The Journal of Biological Chemistry·Cristian IlioaiaAlexander V Ruban
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Nov 12, 2009·BMC Plant Biology·Michel HavauxChristian Triantaphylidès

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