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Role of the two PsaE isoforms on O 2 reduction at photosystem I in Arabidopsis thaliana.
- Source :
-
Biochimica et biophysica acta. Bioenergetics [Biochim Biophys Acta Bioenerg] 2020 Jan 01; Vol. 1861 (1), pp. 148089. Date of Electronic Publication: 2019 Nov 06. - Publication Year :
- 2020
-
Abstract
- Leaves of Arabidopsis thaliana plants grown in short days (8 h light) generate more reactive oxygen species in the light than leaves of plants grown in long days (16 h light). The importance of the two PsaE isoforms of photosystem I, PsaE1 and PsaE2, for O <subscript>2</subscript> reduction was studied in plants grown under these different growth regimes. In short day conditions a mutant affected in the amount of PsaE1 (psae1-1) reduced more efficiently O <subscript>2</subscript> than a mutant lacking PsaE2 (psae2-1) as shown by spin trapping EPR spectroscopy on leaves and by following the kinetics of P700 <superscript>+</superscript> reduction in isolated photosystem I. In short day conditions higher O <subscript>2</subscript> reduction protected photosystem II against photoinhibition in psae1-1. In contrast in long day conditions the presence of PsaE1 was clearly beneficial for photosynthetic electron transport and for the stability of the photosynthetic apparatus under photoinhibitory conditions. We conclude that the two PsaE isoforms have distinct functions and we propose that O <subscript>2</subscript> reduction at photosystem I is beneficial for the plant under certain environmental conditions.<br /> (Copyright © 2019 Elsevier B.V. All rights reserved.)
- Subjects :
- Arabidopsis genetics
Arabidopsis Proteins genetics
Electron Transport physiology
Isoenzymes genetics
Isoenzymes metabolism
Oxidation-Reduction
Photosystem I Protein Complex genetics
Arabidopsis enzymology
Arabidopsis Proteins metabolism
Oxygen metabolism
Photosynthesis physiology
Photosystem I Protein Complex metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1879-2650
- Volume :
- 1861
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Biochimica et biophysica acta. Bioenergetics
- Publication Type :
- Academic Journal
- Accession number :
- 31669487
- Full Text :
- https://doi.org/10.1016/j.bbabio.2019.148089