Advanced

Carotenoid cation formation and the regulation of photosynthetic light harvesting

Holt, N. E.; Zigmantas, Donatas LU ; Valkunas, L.; Li, X. P.; Niyogi, K. K. and Fleming, G. R. (2005) In Science 307(5708). p.433-436
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 chlorophyll-zeaxanthin heterodimer, which then undergoes charge separation, is the mechanism... (More)
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 chlorophyll-zeaxanthin heterodimer, which then undergoes charge separation, is the mechanism for excess energy dissipation during feedback deexcitation. (Less)
Please use this url to cite or link to this publication:
author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
photoprotection, complexes, state, arabidopsis mutants, photosystem-ii, xanthophyll cycle, purple bacteria, psbs protein, plants, energy
in
Science
volume
307
issue
5708
pages
433 - 436
publisher
The American Association for the Advancement of Science
external identifiers
  • Scopus:12344313072
ISSN
1095-9203
DOI
10.1126/science.1105833
language
English
LU publication?
no
id
fa85962b-86e6-4e2f-9bfa-be0c1c96459b (old id 1432940)
date added to LUP
2009-07-01 12:20:04
date last changed
2017-02-12 04:22:11
@article{fa85962b-86e6-4e2f-9bfa-be0c1c96459b,
  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 chlorophyll-zeaxanthin heterodimer, which then undergoes charge separation, is the mechanism for excess energy dissipation during feedback deexcitation.},
  author       = {Holt, N. E. and Zigmantas, Donatas and Valkunas, L. and Li, X. P. and Niyogi, K. K. and Fleming, G. R.},
  issn         = {1095-9203},
  keyword      = {photoprotection,complexes,state,arabidopsis mutants,photosystem-ii,xanthophyll cycle,purple bacteria,psbs protein,plants,energy},
  language     = {eng},
  number       = {5708},
  pages        = {433--436},
  publisher    = {The American Association for the Advancement of Science},
  series       = {Science},
  title        = {Carotenoid cation formation and the regulation of photosynthetic light harvesting},
  url          = {http://dx.doi.org/10.1126/science.1105833},
  volume       = {307},
  year         = {2005},
}