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Abstract
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Photosynthetic electron transport regulates the expression of cytosolic ascorbate peroxidase genes in Arabidopsis during excess light stress.

S Karpinski, C Escobar, B Karpinska, G Creissen, P M Mullineaux
S Karpinski
Department of Applied Genetics, John Innes Centre, Norwich Research Park, Colney, United Kingdom. stanislaw.karpinski@genfys.slu.se
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C Escobar
Department of Applied Genetics, John Innes Centre, Norwich Research Park, Colney, United Kingdom. stanislaw.karpinski@genfys.slu.se
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B Karpinska
Department of Applied Genetics, John Innes Centre, Norwich Research Park, Colney, United Kingdom. stanislaw.karpinski@genfys.slu.se
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G Creissen
Department of Applied Genetics, John Innes Centre, Norwich Research Park, Colney, United Kingdom. stanislaw.karpinski@genfys.slu.se
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P M Mullineaux
Department of Applied Genetics, John Innes Centre, Norwich Research Park, Colney, United Kingdom. stanislaw.karpinski@genfys.slu.se
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Published April 1997. DOI: https://doi.org/10.1105/tpc.9.4.627

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Abstract

Exposure of Arabidopsis plants that were maintained under low light (200 mumol of photons m-2 sec-1) to excess light (2000 mumol of photons m-2 sec-1) for 1 hr caused reversible photoinhibition of photosynthesis. Measurements of photosynthetic parameters and the use of electron transport inhibitors indicated that a novel signal transduction pathway was initiated at plastoquinone and regulated, at least in part, by the redox status of the plastoquinone pool. This signal, which preceded the photooxidative burst of hydrogen peroxide (H2O2) associated with photoinhibition of photosynthesis, resulted in a rapid increase (within 15 min) in mRNA levels of two cytosolic ascorbate peroxidase genes (APX1 and APX2). Treatment of leaves with exogenous reduced glutathione abolished this signal, suggesting that glutathione or the redox status of the glutathione pool has a regulatory impact on this signaling pathway. During recovery from photooxidative stress, transcripts for cytosolic glutathione reductase (GOR2) increased, emphasizing the role of glutathione in this stress.

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Photosynthetic electron transport regulates the expression of cytosolic ascorbate peroxidase genes in Arabidopsis during excess light stress.
S Karpinski, C Escobar, B Karpinska, G Creissen, P M Mullineaux
The Plant Cell Apr 1997, 9 (4) 627-640; DOI: 10.1105/tpc.9.4.627

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Photosynthetic electron transport regulates the expression of cytosolic ascorbate peroxidase genes in Arabidopsis during excess light stress.
S Karpinski, C Escobar, B Karpinska, G Creissen, P M Mullineaux
The Plant Cell Apr 1997, 9 (4) 627-640; DOI: 10.1105/tpc.9.4.627
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