Thermoluminescence properties of the isolated photosystem two reaction centre |
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Authors: | Imre Vass David J Chapman James Barber |
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Institution: | (1) Institute of Plant Physiology, Biological Research Center, Hungarian Academy of Sciences, P.O. Box 521, H-6701 Szeged, Hungary;(2) AFCR Photosynthesis Research Group, Department of Pure and Applied Biology, Imperial College, SW7 2BB London, U.K. |
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Abstract: | Formation of thermoluminescence signals is characteristics of energy- and charge storage in Photosystem II. In isolated D1/D2/cytochrome b-559 Photosystem II reaction centre preparation four thermoluminescence components were found. These appear at -180 (Z band), between -80 and -50 (Zv band), at -30 and at +35°C. The Z band arises from pigment molecules but not correlated with photosynthetic activity. The Zv and -30°C bands arise from the recombination of charge pairs stabilized in the Photosystem II reaction centre complex. The +35°C band probably corresponds to the artefact glow peak resulting from a pigment-protein-detergent interaction in subchloroplast preparations (Rózsa Zs, Droppa M and Horváth G (1989) Biochim Biophys Acta 973, 350–353).Abbreviations Chl
chlorophyll
- Cyt
cytochrome
- DCMU
3-(3,4-dichlorophenyl)-1,1 -dimethylurea
- D1
psbA gene product
- D2
psbD gene product
- P680
primary electron donor of PS II
- Pheo
pheophytin
- PS II
Photosystem II
- QA
primary quinone acceptor of PS II
- QB
secondary quinone acceptor of PS II
- RC
reaction centre of PS II
- TL
thermoluminescence |
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Keywords: | Photosystem II D1/D2/cytochrome b-599 thermoluminescence charge recombination |
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