Economic photoprotection in photosystem II that retains a complete light-harvesting system with slow energy traps

被引：79

作者：

Belgio, Erica ^{[1
]}

Kapitonova, Ekaterina ^{[1
]}

Chmeliov, Jevgenij ^{[2
,3
]}

Duffy, Christopher D. P. ^{[1
]}

Ungerer, Petra ^{[1
]}

Valkunas, Leonas ^{[2
,3
]}

Ruban, Alexander V. ^{[1
]}

机构：

[1] Queen Mary Univ London, Sch Biol & Chem Sci, London E1 4NS, England

[2] Vilnius Univ, Fac Phys, Dept Theoret Phys, LT-10222 Vilnius, Lithuania

[3] Ctr Phys Sci & Technol, Inst Phys, LT-01108 Vilnius, Lithuania

来源：

NATURE COMMUNICATIONS | 2014年 / 5卷

基金：

英国生物技术与生命科学研究理事会; 英国工程与自然科学研究理事会;

关键词：

CHLOROPHYLL FLUORESCENCE; STROMA LAMELLAE; HIGHER-PLANTS; ANTENNA; DISSIPATION; ZEAXANTHIN; LEAVES; IDENTIFICATION; MEMBRANES; DYNAMICS;

D O I：

10.1038/ncomms5433

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The light-harvesting antenna of higher plant photosystem II has an intrinsic capability for self-defence against intense sunlight. The thermal dissipation of excess energy can be measured as the non-photochemical quenching of chlorophyll fluorescence. It has recently been proposed that the transition between the light-harvesting and self-defensive modes is associated with a reorganization of light-harvesting complexes. Here we show that despite structural changes, the photosystem II cross-section does not decrease. Our study reveals that the efficiency of energy trapping by the non-photochemical quencher(s) is lower than the efficiency of energy capture by the reaction centres. Consequently, the photoprotective mechanism works effectively for closed rather than open centres. This type of defence preserves the exceptional efficiency of electron transport in a broad range of light intensities, simultaneously ensuring high photosynthetic productivity and, under hazardous light conditions, sufficient photoprotection for both the reaction centre and the light-harvesting pigments of the antenna.

引用

页数：8

共 35 条

[1] Higher Plant Photosystem II Light-Harvesting Antenna, Not the Reaction Center, Determines the Excited-State Lifetime-Both the Maximum and the Nonphotochemically Quenched [J].