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  The back and forth of energy transfer between carotenoids and chlorophylls and its role in the regulation of light harvesting.

Holleboom, C. P., & Walla, P. J. (2014). The back and forth of energy transfer between carotenoids and chlorophylls and its role in the regulation of light harvesting. Photosynthesis Research, 119(1-2), 215-221. doi:10.1007/s11120-013-9815-4.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-0F44-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-CB60-5
Genre: Journal Article

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1900361.pdf (Publisher version), 497KB
 
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 Creators:
Holleboom, C. P., Author
Walla, P. J.1, Author              
Affiliations:
1Research Group of Biomolecular Spectroscopy and Single-Molecule Detection, MPI for biophysical chemistry, Max Planck Society, ou_578565              

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Free keywords: Light-harvesting; Carotenoids; Chlorophylls; Carotenoid-phthalocyanine dyads; Energy transfer; Excitonic interactions
 Abstract: Many aspects in the regulation of photosynthetic light-harvesting of plants are still quite poorly understood. For example, it is still a matter of debate which physical mechanism(s) results in the regulation and dissipation of excess energy in high light. Many researchers agree that electronic interactions between chlorophylls (Chl) and certain states of carotenoids are involved in these mechanisms. However, in particular, the role of the first excited state of carotenoids (Car S-1) is not easily revealed, because of its optical forbidden character. The use of two-photon excitation is an elegant approach to address directly this state and to investigate the energy transfer in the direction Car S-1 -> Chl. Meanwhile, it has been applied to a large variety of systems starting from simple carotenoid-tetrapyrrole model compounds up to entire plants. Here, we present a systematic summary of the observations obtained by two-photon excitation about Car S-1 -> Chl energy transfer in systems with increasing complexity and the correlation to fluorescence quenching. We compare these observations directly with the energy transfer in the opposite direction, Chl -> Car S-1, for the same systems as obtained in pump-probe studies. We discuss what surprising aspects of this comparison led us to the suggestion that quenching excitonic Car-Chl interactions could contribute to the regulation of light harvesting, and how this suggestion can be connected to other models proposed.

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Language(s): eng - English
 Dates: 2014-02
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1007/s11120-013-9815-4
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Title: Photosynthesis Research
Source Genre: Journal
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Pages: - Volume / Issue: 119 (1-2) Sequence Number: - Start / End Page: 215 - 221 Identifier: -