Singlet oxygen production in photosystem II and related protection mechanism

被引：409

作者：

Krieger-Liszkay, Anja ^{[1
]}

Fufezan, Christian ^{[2
]}

Trebst, Achim ^{[3
]}

机构：

[1] CEA, Inst Biol & Technol Saclay, CNRS, Serv Bioenerget Biol Struct,URA 2096, F-91191 Gif Sur Yvette, France

[2] Univ Munster, Inst Biochem & Biotechnol, D-48143 Munster, Germany

[3] Ruhr Univ Bochum, D-44780 Bochum, Germany

来源：

PHOTOSYNTHESIS RESEARCH | 2008年 / 98卷 / 1-3期

关键词：

Photoinhibition; Photosystem II; Q(A) midpoint potential; Singlet oxygen;

D O I：

10.1007/s11120-008-9349-3

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

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.

引用

页码：551 / 564

页数：14

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