NDLI: PsbS-dependent enhancement of feedback de-excitation protects photosystem II from photoinhibition.

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PsbS-dependent enhancement of feedback de-excitation protects photosystem II from photoinhibition.

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PsbS-dependent enhancement of feedback de-excitation protects photosystem II from photoinhibition.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Li, Xiao-ping Niyogi, Krishna K. Gilmore, Adam M. Muller-moule, Patricia
Description	Author Affiliation: Li XP ( Department of Plant and Microbial Biology, University of California, Berkeley 94720-3102, USA.);
Abstract	Feedback de-excitation (qE) regulates light harvesting in plants to prevent inhibition of photosynthesis when light absorption exceeds photosynthetic capacity. Although the mechanism of qE is not completely understood, it is known to require a low thylakoid lumen pH, de-epoxidized xanthophylls, and the photosystem II protein PsbS. During a short-term 4-h exposure to excess light, three PsbS- and qE-deficient Arabidopsis thaliana mutants that differed in xanthophyll composition were more photoinhibited than the wild type. The extent of photoinhibition was the same in all of the mutants, suggesting that qE capacity rather than xanthophyll composition is critical for photoprotection in short-term high light, in contrast to longer-term high light conditions (days) when additional antioxidant roles of specific xanthophylls are evident. Plants with a 2-fold increase in qE capacity were generated by overexpression of PsbS, demonstrating that the level of PsbS limits the qE capacity in wild-type Arabidopsis. These results are consistent with the idea that variations in PsbS expression are responsible for species-specific and environmentally induced differences in qE capacity observed in nature. Furthermore, plants with higher qE capacity were more resistant to photoinhibition than the wild type. Increased qE was associated with decreased photosystem II excitation pressure and changes in the fractional areas of chlorophyll a fluorescence lifetime distributions, but not the lifetime centers, suggesting that qE protects from photoinhibition by preventing overreduction of photosystem II electron acceptors. Engineering of qE capacity by PsbS overexpression could potentially yield crop plants that are more resistant to environmental stress.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	23
Volume Number	99
Language	English
Publisher	National Academy of Sciences
Publisher Date	2002-11-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Arabidopsis Physiology Photosynthetic Reaction Center Complex Proteins Metabolism Photosystem II Protein Complex Plant Proteins Genetics Radiation Effects Arabidopsis Proteins Chlorophyll DNA Primers DNA, Plant Gene Expression Regulation, Plant Kinetics Light-Harvesting Protein Complexes Nuclear Proteins Oxygen Polymerase Chain Reaction Quantum Theory RNA, Plant Spectrometry, Fluorescence Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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