Document Detail

Redox regulation of photosynthetic gene expression.
MedLine Citation:
PMID:  23148274     Owner:  NLM     Status:  MEDLINE    
Redox chemistry and redox regulation are central to the operation of photosynthesis and respiration. However, the roles of different oxidants and antioxidants in the regulation of photosynthetic or respiratory gene expression remain poorly understood. Leaf transcriptome profiles of a range of Arabidopsis thaliana genotypes that are deficient in either hydrogen peroxide processing enzymes or in low molecular weight antioxidant were therefore compared to determine how different antioxidant systems that process hydrogen peroxide influence transcripts encoding proteins targeted to the chloroplasts or mitochondria. Less than 10 per cent overlap was observed in the transcriptome patterns of leaves that are deficient in either photorespiratory (catalase (cat)2) or chloroplastic (thylakoid ascorbate peroxidase (tapx)) hydrogen peroxide processing. Transcripts encoding photosystem II (PSII) repair cycle components were lower in glutathione-deficient leaves, as were the thylakoid NAD(P)H (nicotinamide adenine dinucleotide (phosphate)) dehydrogenases (NDH) mRNAs. Some thylakoid NDH mRNAs were also less abundant in tAPX-deficient and ascorbate-deficient leaves. Transcripts encoding the external and internal respiratory NDHs were increased by low glutathione and low ascorbate. Regulation of transcripts encoding specific components of the photosynthetic and respiratory electron transport chains by hydrogen peroxide, ascorbate and glutathione may serve to balance non-cyclic and cyclic electron flow pathways in relation to oxidant production and reductant availability.
Guillaume Queval; Christine H Foyer
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Philosophical transactions of the Royal Society of London. Series B, Biological sciences     Volume:  367     ISSN:  1471-2970     ISO Abbreviation:  Philos. Trans. R. Soc. Lond., B, Biol. Sci.     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-11-13     Completed Date:  2013-04-22     Revised Date:  2014-01-10    
Medline Journal Info:
Nlm Unique ID:  7503623     Medline TA:  Philos Trans R Soc Lond B Biol Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  3475-85     Citation Subset:  IM    
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MeSH Terms
Arabidopsis / enzymology,  genetics,  metabolism
Arabidopsis Proteins / genetics,  metabolism
Ascorbate Peroxidases / genetics,  metabolism
Ascorbic Acid / genetics,  metabolism
Cell Respiration
Chloroplasts / genetics,  metabolism
Electron Transport
Gene Expression Profiling / methods
Gene Expression Regulation, Plant*
Genes, Plant*
Glutathione / genetics,  metabolism
Hydrogen Peroxide / metabolism
Mitochondria / genetics,  metabolism
Peroxisomes / genetics,  metabolism
Photosynthesis / genetics*
Photosystem II Protein Complex / genetics,  metabolism
Plant Leaves / genetics,  metabolism
Reactive Oxygen Species / metabolism
Signal Transduction
Thylakoid Membrane Proteins / genetics,  metabolism
Reg. No./Substance:
0/Arabidopsis Proteins; 0/Photosystem II Protein Complex; 0/Reactive Oxygen Species; 0/Thylakoid Membrane Proteins; BBX060AN9V/Hydrogen Peroxide; EC protein, Arabidopsis; EC Peroxidases; EC protein, Arabidopsis; GAN16C9B8O/Glutathione; PQ6CK8PD0R/Ascorbic Acid

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