Journal
CHEMICAL PHYSICS LETTERS
Volume 483, Issue 4-6, Pages 262-267Publisher
ELSEVIER
DOI: 10.1016/j.cplett.2009.10.085
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Funding
- Deutsche Forschungsgemeinschaft [SFB 663]
- European Union [MRTN-CT-2003-505069]
- Project 'Samba per 2'
- Regional Development Fund
- Trento Research Council, Italy
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The regulation of light-harvesting (called non-photochemical quenching, NPQ) is an essential photoprotective mechanism active in plants. Total NPQ is dependent on PsbS, a pH-sensing protein, and on the action of the xanthophyll carotenoid zeaxanthin (Zx). Using ultrafast fluorescence on intact leaves we demonstrate two independent NPQ quenching sites in vivo which depend differently on the actions of PsbS and Zx. The first site is formed in the functionally detached major light-harvesting complex of PS II and depends strictly on PsbS. The second site is in the minor antennae of photosystem (PS) II and quenching depends on the presence of Zx. (C) 2009 Elsevier B.V. All rights reserved.
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