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Impaired Mitochondrial Transcription Termination Disrupts the Stromal Redox Poise in Chlamydomonas  (2017)

Authors:
Uhmeyer, Andreas; Cecchin, Michela; Ballottari, Matteo; Wobbe, Lutz
Title:
Impaired Mitochondrial Transcription Termination Disrupts the Stromal Redox Poise in Chlamydomonas
Year:
2017
Type of item:
Articolo in Rivista
Tipologia ANVUR:
Articolo su rivista
Language:
Inglese
Referee:
No
Name of journal:
Plant Physiology
ISSN of journal:
0032-0889
N° Volume:
174
Number or Folder:
3
:
ASSPP
Page numbers:
1399-1419
Keyword:
Photosynthesis, chloroplast, mitochondria, photoprotection, microalgae
Short description of contents:
In photosynthetic eukaryotes, the metabolite exchange between chloroplast and mitochondria ensures efficient photosynthesis under saturating light conditions. The Chlamydomonas reinhardtii mutant stm6 is devoid of the mitochondrial transcription termination factor MOC1 and aberrantly expresses the mitochondrial genome, resulting in enhanced photosynthetic hydrogen production and diminished light tolerance. We analyzed the modulation of mitochondrial and chlororespiration during the acclimation of stm6 and the MOC1-complemented strain to excess light. Although light stress stimulated mitochondrial respiration via the energy-conserving cytochrome c pathway in both strains, the mutant was unable to fine-tune the expression and activity of oxidative phosphorylation complex I in excess light, which was accompanied by an increased mitochondrial respiration via the alternative oxidase pathway. Furthermore, stm6 failed to fully activate chlororespiration and cyclic electron flow due to a more oxidized state of the chloroplast stroma, which is caused by an increased mitochondrial electron sink capacity. Increased susceptibility to photoinhibition of PSII in stm6 demonstrates that the MOC1-dependent modulation of mitochondrial respiration helps control the stromal redox poise as a crucial part of high-light acclimation in C. reinhardtii.
Product ID:
98379
Handle IRIS:
11562/966180
Last Modified:
March 20, 2018
Bibliographic citation:
Uhmeyer, Andreas; Cecchin, Michela; Ballottari, Matteo; Wobbe, Lutz, Impaired Mitochondrial Transcription Termination Disrupts the Stromal Redox Poise in Chlamydomonas «Plant Physiology» , vol. 174 , n. 32017pp. 1399-1419

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SOLENALGAE Department Biotecnologie Matteo Ballottari
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