Abstract
Photosynthetic 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.
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Dates
Type | When |
---|---|
Created | 20 years, 7 months ago (Jan. 20, 2005, 4:11 p.m.) |
Deposited | 1 year, 7 months ago (Jan. 9, 2024, 11:45 p.m.) |
Indexed | 1 week, 2 days ago (Aug. 27, 2025, 12:38 p.m.) |
Issued | 20 years, 7 months ago (Jan. 21, 2005) |
Published | 20 years, 7 months ago (Jan. 21, 2005) |
Published Print | 20 years, 7 months ago (Jan. 21, 2005) |
@article{Holt_2005, title={Carotenoid Cation Formation and the Regulation of Photosynthetic Light Harvesting}, volume={307}, ISSN={1095-9203}, url={http://dx.doi.org/10.1126/science.1105833}, DOI={10.1126/science.1105833}, number={5708}, journal={Science}, publisher={American Association for the Advancement of Science (AAAS)}, author={Holt, Nancy E. and Zigmantas, Donatas and Valkunas, Leonas and Li, Xiao-Ping and Niyogi, Krishna K. and Fleming, Graham R.}, year={2005}, month=jan, pages={433–436} }