| Thioredoxin m4 controls photosynthetic alternative electron pathways in Arabidopsis. | |
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MedLine Citation:
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PMID: 23151348 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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In addition to the linear electron flow (LEF), a cyclic electron flow (CEF) around photosystem I (PSI) occurs in chloroplasts. In CEF, electrons flow back from the donor site of PSI to the plastoquinone pool (PQ) via two main routes: one that involves the PGR5/PGRL1 complex (PGR), and one that is dependent on the NADH dehydrogenase-like complex (NDH). While the importance of CEF in photosynthesis and photoprotection has been clearly established, little is known about its regulation. In this study we have examined the possibility of a redox regulation and surveyed the putative role of chloroplastic thioredoxins (TRX). Using Arabidopsis mutants lacking different TRX isoforms, we demonstrated in vivo that TRXm4 specifically plays a role in the down-regulation of the NDH-dependent plastoquinone reduction pathway. This result was confirmed in tobacco plants overexpressing the TRXm4 orthologous gene. In vitro assays performed with isolated chloroplasts and purified TRXm4 indicated that TRXm4 also negatively controls the PGR pathway. The physiological significance of this regulation was investigated under steady-state photosynthesis and in the pgr5 mutant background. Lack of TRXm4 reversed the growth phenotype of the pgr5 mutant, but it did not compensate for the impaired photosynthesis and photoinhibition sensitivity. This suggests that the physiological role of TRXm4 occurs in vivo by a mechanism distinct from the direct up-regulation of CEF. |
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Authors:
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Agathe Courteille; Simona Vesa; Ruth Sanz-Barrio; Anne-Claire Cazalé-Noël; Noëlle Becuwe-Linka; Immaculada Farran; Michel Havaux; Pascal Rey; Dominique Rumeau |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-11-15 |
Journal Detail:
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Title: Plant physiology Volume: - ISSN: 1532-2548 ISO Abbreviation: Plant Physiol. Publication Date: 2012 Nov |
Date Detail:
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Created Date: 2012-11-16 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0401224 Medline TA: Plant Physiol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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1 iBEB, SBVME, LEMP, UMR-CNRS 7265; |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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