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231224s2014 xx |||||o 00| ||eng c |
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|a 10.1016/j.plaphy.2014.01.014
|2 doi
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|a pubmed24n0785.xml
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|a (NLM)24529497
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|a (PII)S0981-9428(14)00028-X
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|a DE-627
|b ger
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|e rakwb
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|a eng
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|a Stamatakis, Kostas
|e verfasserin
|4 aut
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|a On the question of the light-harvesting role of β-carotene in photosystem II and photosystem I core complexes
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|c 2014
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 30.03.2015
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|a Date Revised 30.09.2020
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Copyright © 2014 Elsevier Masson SAS. All rights reserved.
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|a β-Carotene is the only carotenoid present in the core complexes of Photosystems I and II. Its proximity to chlorophyll a molecules enables intermolecular electronic interactions, including β-carotene to chlorophyll a electronic excitation transfers. However, it has been well documented that, compared to chlorophylls and to phycobilins, the light harvesting efficiency of β-carotenes for photosynthetic O2 evolution is poor. This is more evident in cyanobacteria than in plants and algae because they lack accessory light harvesting pigments with absorptions that overlap the β-carotene absorption. In the present work we investigated the light harvesting role of β-carotenes in the cyanobacterium Synechococcus sp. PCC 7942 using selective β-carotene excitation and selective Photosystem detection of photo-induced electron transport to and from the intersystem plastoquinones (the plastoquinone pool). We report that, although selectively excited β-carotenes transfer electronic excitation to the chlorophyll a of both photosystems, they enable only the oxidation of the plastoquinone pool by Photosystem I but not its reduction by Photosystem II. This may suggest a light harvesting role for the β-carotenes of the Photosystem I core complex but not for those of the Photosystem II core complex. According to the present investigation, performed with whole cyanobacterial cells, the lower photosynthesis yields measured with β-Car-absorbed light can be attributed to the different excitation trapping efficiencies in the reaction centers of PSI and PSII
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|a Journal Article
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|a 77 K fluorescence spectra
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|a Chlorophyll fluorescence
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|a Cyanobacteria
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|a State transitions
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|a β-Carotene
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|a Photosystem I Protein Complex
|2 NLM
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|a Photosystem II Protein Complex
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|a beta Carotene
|2 NLM
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|a 01YAE03M7J
|2 NLM
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|a Chlorophyll
|2 NLM
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|a 1406-65-1
|2 NLM
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|a Oxygen
|2 NLM
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|a S88TT14065
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|a Tsimilli-Michael, Merope
|e verfasserin
|4 aut
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|a Papageorgiou, George C
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Plant physiology and biochemistry : PPB
|d 1991
|g 81(2014) vom: 14. Aug., Seite 121-7
|w (DE-627)NLM098178261
|x 1873-2690
|7 nnns
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|g volume:81
|g year:2014
|g day:14
|g month:08
|g pages:121-7
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|u http://dx.doi.org/10.1016/j.plaphy.2014.01.014
|3 Volltext
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