English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

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

MPS-Authors
/persons/resource/persons40135

Pesaresi,  P.
Dept. of Plant Breeding and Yield Physiology (Francesco Salamini), MPI for Plant Breeding Research, Max Planck Society;

/persons/resource/persons39954

Varotto,  C.
Dept. of Plant Breeding and Yield Physiology (Francesco Salamini), MPI for Plant Breeding Research, Max Planck Society;
Dept. of Molecular Plant Genetics (Heinz Saedler), MPI for Plant Breeding Research, Max Planck Society;

/persons/resource/persons40180

Salamini,  F.
Dept. of Plant Breeding and Yield Physiology (Francesco Salamini), MPI for Plant Breeding Research, Max Planck Society;

/persons/resource/persons40073

Leister,  D.
Dept. of Plant Breeding and Yield Physiology (Francesco Salamini), MPI for Plant Breeding Research, Max Planck Society;

External Resource
No external resources are shared
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

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.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0012-3E1E-9
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.