Article (Scientific journals)
The onset of NPQ and Deltamu(H)+ upon illumination of tobacco plants studied through the influence of mitochondrial electron transport.
Cardol, Pierre; De Paepe, Rosine; Franck, Fabrice et al.
2010In Biochimica et Biophysica Acta, 1797 (2), p. 177-88
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Keywords :
Adenosine Triphosphate/metabolism; Carbon Dioxide/metabolism; Electron Transport/physiology; Electron Transport Complex I/genetics/metabolism; Light; Membrane Potential, Mitochondrial; Mitochondria/metabolism; Photochemistry; Photosynthesis; Plant Leaves/metabolism/radiation effects; Tobacco/radiation effects
Abstract :
[en] The relationship between the development of photoprotective mechanisms (non-photochemical quenching, NPQ), the generation of the electrochemical proton gradient in the chloroplast and the capacity to assimilate CO(2) was studied in tobacco dark-adapted leaves at the onset of illumination with low light. These conditions induce the generation of a transient NPQ, which relaxes in the light in parallel with the activation of the Calvin cycle. Wild-type plants were compared with a CMSII mitochondrial mutant, which lacks the respiratory complex I and shows a delayed activation of photosynthesis. In the mutant, a slower onset of photosynthesis was mirrored by a decreased capacity to develop NPQ. This correlates with a reduced efficiency to reroute electrons at the PSI reducing side towards cyclic electron flow around PSI and/or other alternative acceptor pools, and with a smaller ability to generate a proton motive force in the light. Altogether, these data illustrate the tight relationship existing between the capacity to evacuate excess electrons accumulated in the intersystem carriers and the capacity to dissipate excess photons during a dark to light transition. These data also underline the essential role of respiration in modulating the photoprotective response in dark-adapted leaves, by poising the cellular redox state.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Cardol, Pierre  ;  Université de Liège - ULiège > Département des sciences de la vie > Génétique
De Paepe, Rosine
Franck, Fabrice ;  Université de Liège - ULiège > Biochimie végétale
Forti, Giorgio
Finazzi, Giovanni
Language :
English
Title :
The onset of NPQ and Deltamu(H)+ upon illumination of tobacco plants studied through the influence of mitochondrial electron transport.
Publication date :
2010
Journal title :
Biochimica et Biophysica Acta
ISSN :
0006-3002
eISSN :
1878-2434
Publisher :
Elsevier, Amsterdam, Netherlands
Volume :
1797
Issue :
2
Pages :
177-88
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
2009 Elsevier B.V. All rights reserved.
Available on ORBi :
since 13 May 2010

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