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  The role of Delta pH-dependent dissipation of excitation energy in protecting photosystem II against light-induced damage in Arabidopsis thaliana

Grasses, T., Pesaresi, P., Schiavon, F., Varotto, C., Salamini, F., Jahns, P., et al. (2002). The role of Delta pH-dependent dissipation of excitation energy in protecting photosystem II against light-induced damage in Arabidopsis thaliana. Plant Physiology and Biochemistry, 40(1), 41-49.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-3E1E-9 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0012-3E21-0
Genre: Journal Article

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 Creators:
Grasses, T., Author
Pesaresi, P.1, Author              
Schiavon, F., Author
Varotto, C.1, 2, Author              
Salamini, F.1, Author              
Jahns, P., Author
Leister, D.1, Author              
Affiliations:
1Dept. of Plant Breeding and Yield Physiology (Francesco Salamini), MPI for Plant Breeding Research, Max Planck Society, ou_1113570              
2Dept. of Molecular Plant Genetics (Heinz Saedler), MPI for Plant Breeding Research, Max Planck Society, ou_1113568              

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Free keywords: Arabidopsis thaliana; mutant; non-photochemical quenching; photoprotection; photosystem II; PsbS; qE
 Abstract: The Arabidopsis thaliana subunit PsbS of photosystem II (PSII) is essential for the non-photochemical quenching of chlorophyll fluorescence and thus for DeltapH-dependent energy dissipation (qE). As a result of the excision of an En-transposon, a frameshift mutation in the psbS gene was obtained, which results in the complete absence of the PsbS protein and of qE. Two-dimensional gel analyses of thylakoid membranes indicated that the depletion of PsbS has no effect on PSII composition, excluding a structural role for PsbS in the organization of the PSII antenna. The susceptibility of mutant plants to photoinactivation of PSII was significantly increased during exposure to high light for up to 8 h. Divergence of mutant plants from wild-type levels of photoinactivation were most pronounced during the first 2 h of illumination, while after longer exposure times the rate of PSII inactivation were similar in both genotypes. The increased PSII inactivation in the mutant was not accompanied by an increased rate of D1 protein degradation, and recovery of PSII activity in the mutant under low Light was similar or even faster in comparison to wild-type plants. However, growth under high Light intensities resulted in decreased growth rates of psbs mutant plants. We conclude that energy dissipation in PSII related to qE is not primarily required for the protection of PSII against light-induced destruction, but may rather be involved in reducing the electron pressure on the photosynthetic electron transport chain at saturating light intensities. (C) 2002 Editions scientifiques et medicales Elsevier SAS. All rights reserved.

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Language(s): eng - English
 Dates: 2002-01
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 28823
ISI: 000174080300006
 Degree: -

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Title: Plant Physiology and Biochemistry
  Alternative Title : Plant Physiol. Biochem.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 40 (1) Sequence Number: - Start / End Page: 41 - 49 Identifier: ISSN: 0981-9428