Article (Scientific journals)
A dual strategy to cope with high light in Chlamydomonas reinhardtii
Allorent, G; Tokutsu, R; Roach, T et al.
2013In Plant Cell, 25 (2), p. 545-557
Peer Reviewed verified by ORBi
 

Files


Full Text
allorent_et_al_2013.pdf
Author preprint (2.11 MB)
Request a copy

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
photosynthesis; chlamydomonas; non-photochemical quenching; state transitions
Abstract :
[en] Absorption of light in excess of the capacity for photosynthetic electron transport is damaging to photosynthetic organisms. Several mechanisms exist to avoid photodamage, which are collectively referred to as nonphotochemical quenching. This term comprises at least two major processes. State transitions (qT) represent changes in the relative antenna sizes of photosystems II and I. High energy quenching (qE) is the increased thermal dissipation of light energy triggered by lumen acidification. To investigate the respective roles of qE and qT in photoprotection, a mutant (npq4 stt7-9) was generated in Chlamydomonas reinhardtii by crossing the state transition–deficient mutant (stt7-9) with a strain having a largely reduced qE capacity (npq4). The comparative phenotypic analysis of the wild type, single mutants, and double mutants reveals that both state transitions and qE are induced by high light. Moreover, the double mutant exhibits an increased photosensitivity with respect to the single mutants and the wild type. Therefore, we suggest that besides qE, state transitions also play a photoprotective role during high light acclimation of the cells, most likely by decreasing hydrogen peroxide production. These results are discussed in terms of the relative photoprotective benefit related to thermal dissipation of excess light and/or to the physical displacement of antennas from photosystem II.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Allorent, G
Tokutsu, R
Roach, T
Peers, G
Cardol, Pierre  ;  Université de Liège - ULiège > Département des sciences de la vie > Génétique
Girard-Bascou, J
Seigneurin-Berny, P
Kuntz, M
Breyton, C
Franck, Fabrice ;  Université de Liège - ULiège > Labo de Bioénergétique
Wollman, F-A
Niyogi, K
Krieger-Liszkay, A
Minagawa, J
Finazzi, G
More authors (5 more) Less
Language :
English
Title :
A dual strategy to cope with high light in Chlamydomonas reinhardtii
Publication date :
March 2013
Journal title :
Plant Cell
ISSN :
1040-4651
eISSN :
1532-298X
Publisher :
American Society of Plant Biologists, Rockville, United States - Maryland
Volume :
25
Issue :
2
Pages :
545-557
Peer reviewed :
Peer Reviewed verified by ORBi
European Projects :
FP7 - 245070 - SUNBIOPATH - Towards a better sunlight to biomass conversion efficiency in microalgae
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE]
CE - Commission Européenne [BE]
Available on ORBi :
since 24 May 2013

Statistics


Number of views
56 (12 by ULiège)
Number of downloads
5 (4 by ULiège)

Scopus citations®
 
167
Scopus citations®
without self-citations
129
OpenCitations
 
160

Bibliography


Similar publications



Contact ORBi