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28 March 2024
 
  » pubmed » pmid15662017

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Carotenoid cation formation and the regulation of photosynthetic light harvesting
Nancy E Holt ; Donatas Zigmantas ; Leonas Valkunas ; Xiao-Ping Li ; Krishna K Niyogi ; Graham R Fleming ;
Date 21 Jan 2005
Journal Science, 307 (5708), 433-6
AbstractPhotosynthetic light harvesting in excess light is regulated by a process known as feedback deexcitation. Femtosecond transient absorption measurements on thylakoid membranes show selective formation of a carotenoid radical cation upon excitation of chlorophyll under conditions of maximum, steady-state feedback deexcitation. Studies on transgenic Arabidopsis thaliana plants confirmed that this carotenoid radical cation formation is correlated with feedback deexcitation and requires the presence of zeaxanthin, the specific carotenoid synthesized during high light exposure. These results indicate that energy transfer from chlorophyll molecules to a chlorophyllzeaxanthin heterodimer, which then undergoes charge separation, is the mechanism for excess energy dissipation during feedback deexcitation.
Source PubMed, pmid15662017 doi: 10.1126/science.1105833
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