Research article summary (published 7 Sep 2008):

Singlet oxygen production in photosystem II and related protection mechanism.

Full Abstract

High-light illumination of photosynthetic organisms stimulates the production of singlet oxygen by photosystem II (PSII) and causes photo-oxidative stress. In the PSII reaction centre, singlet oxygen is generated by the interaction of molecular oxygen with the excited triplet state of chlorophyll (Chl). The triplet Chl is formed via charge recombination of the light-induced charge pair. Changes in the midpoint potential of the primary electron donor P(680) of the primary acceptor pheophytin or of the quinone acceptor Q(A), modulate the pathway of charge recombination in PSII and influence the yield of singlet oxygen formation. The involvement of singlet oxygen in the process of photoinhibition is discussed. Singlet oxygen is efficiently quenched by beta-carotene, tocopherol or plastoquinone. If not quenched, it can trigger the up-regulation of genes, which are involved in the molecular defence response of photosynthetic organisms against photo-oxidative stress.

Author information

Author/s: Krieger-Liszkay, Anja (A); Fufezan, Christian (C); Trebst, Achim (A);

Affiliation: CEA, Institut de Biologie et Technologies de Saclay, CNRS URA 2096, Service de Bioénergétique Biologie Structurale et Mécanisme, 91191 Gif-sur-Yvette Cedex, France. anja.krieger-liszkay(-atsign-)cea.fr

Journal and publication information

Publication Type: Journal Article; Research Support, Non-U.S. Gov't; Review

Journal: Photosynthesis research (Photosynth Res), published in Netherlands. (Language: eng)

Reference: -2008 Oct-Dec; vol 98 (issue 1-3) : pp 551-64

Dates: Created 2008/12/10; Completed 2009/03/26;

PMID: 18780159, status: MEDLINE (last retrieved date: 3/26/2009)

Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.

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MeSH headings (categories)

This article was linked to the MeSH Headings (categories) shown below.

Animals Coenzymes - metabolism Gene Expression Regulation Light Oxidation-Reduction Photosystem II Protein Complex - metabolism

Photosystem II Protein Complex - metabolism Plastoquinone - metabolism Quinones - metabolism Singlet Oxygen - metabolism Stress, Physiological Tocopherols - metabolism

Note: Bold headings indicate primary MeSH headings or qualifiers.

Associated Chemicals: Coenzymes (0) ; Photosystem II Protein Complex (0) ; Quinones (0) ; Tocopherols (1406-66-2) ; Singlet Oxygen (17778-80-2) ; Plastoquinone (4299-57-4)

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