Singlet oxygen and non-photochemical quenching contribute to oxidation of the plastoquinone-pool under high light stress in Arabidopsis

被引:20
作者
Kruk, Jerzy [1 ]
Szymanska, Renata [1 ]
机构
[1] Jagiellonian Univ, Dept Plant Physiol & Biochem, Fac Biochem Biophys & Biotechnol, PL-30387 Krakow, Poland
来源
BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS | 2012年 / 1817卷 / 05期
关键词
Arabidopsis; High light stress; Plastoquinone; Singlet oxygen; Non-photochemical quenching; Redox state; REDOX STATE; GENE-EXPRESSION; ASCORBATE-PEROXIDASE-2; EXPRESSION; PROTEIN-PHOSPHORYLATION; HYDROGEN-PEROXIDE; PHOTOSYSTEM-I; CHLOROPLAST; BIOSYNTHESIS; ACCLIMATION; LEAVES;
D O I
10.1016/j.bbabio.2012.02.011
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The redox state of plastoquinone-pool in chloroplasts is crucial for driving many responses to variable environment, from short-term effects to those at the gene expression level. In the present studies, we showed for the first time that the plastoquinone-pool undergoes relatively fast oxidation during high light stress of low light-grown Arabidopsis plants. This oxidation was not caused by photoinhibition of photosystem II, but mainly by singlet oxygen generated in photosystem II and non-photochemical quenching in light harvesting complex antenna of the photosystem, as revealed in experiments with a singlet oxygen scavenger and with Arabidopsis npq4 mutant The latter mechanism suppresses the influx of electrons to the plastoquinone-pool preventing its excessive reduction. The obtained results are of crucial importance in light of the function of the redox state of the plastoquinone-pool in triggering many high light-stimulated physiological responses of plants. (C) 2012 Elsevier B.V. All rights reserved.
引用
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页码:705 / 710
页数:6
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