Journal
FEBS LETTERS
Volume 582, Issue 25-26, Pages 3625-3631Publisher
WILEY
DOI: 10.1016/j.febslet.2008.09.044
Keywords
LHCII; Aggregation; Chlorophyll fluorescence; Non-photochemical quenching; Violaxanthin; Zeaxanthin; Arabidopsis mutant
Funding
- Deutsche Forschungsgemeinschaft (DFG) [SFB 663]
- Heinrich-Heine-Universitat Dusseldorf
- Max-Planck-Institute, Germany
- Netherlands Organization for Scientific Research (NWO)
- European Union
- Regional Development Fund
- Trento Research Council, Italy
- Hungarian Fund for Basic Research [OTKA K 63252]
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Time-resolved fluorescence on oligomers of the main light-harvesting complex from higher plants indicate that in vitro oligomerization leads to the formation of a weakly coupled inter-trimer chlorophyll-chlorophyll (Chl) exciton state which converts in tens of ps into a state which is spectrally broad and has a strongly far-red enhanced fluorescence spectrum. Both its lifetime and spectrum show striking similarity with a 400 ps fluorescence component appearing in intact leaves of Arabidopsis when non-photochemical quenching (NPQ) is induced. The fluorescence components with high far-red/red ratio are thus a characteristic marker for NPQ conditions in vivo. The far-red emitting state is shown to be an emissive Chl-Chl charge transfer state which plays a crucial part in the quenching. (c) 2008 Federation of European Biochemical Societies. Published by Elsevier B. V. All rights reserved.
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