Carotenoid Cation Formation and the Regulation of Photosynthetic Light Harvesting
Lawrence Berkeley National Laboratory · University of California, Berkeley
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…
Citation impact
- FWCI
- 18.83
- Percentile
- 100%
- References
- 25
Authors
6- NENancy E. HoltCorresponding
Lawrence Berkeley National Laboratory, University of California, Berkeley
- DZDonatas ZigmantasCorresponding
Lawrence Berkeley National Laboratory, University of California, Berkeley
- LVLeonas ValkūnasCorresponding
Lawrence Berkeley National Laboratory, University of California, Berkeley
- XLXiaoping Li
Lawrence Berkeley National Laboratory, University of California, Berkeley
- KNKrishna Niyogi
Lawrence Berkeley National Laboratory, University of California, Berkeley
Topics & keywords
- Photosynthesis
- Carotenoid
- Thylakoid
- Photochemistry
- Chemistry
- Photosystem II
- Chlorophyll
- Violaxanthin
- Affordable and clean energy