The salt-stress signal transduction pathway that activates the gpx1 promoter is mediated by intracellular H2O2, different from the pathway induced by extracellular H2O2

Plant Physiology
Orna Avsian-KretchmerG Ben-Hayyim

Abstract

Several genes encoding putative glutathione peroxidase have been isolated from a variety of plants, all of which show the highest homology to the phospholipid hydroperoxide isoform. Several observations suggest that the proteins are involved in biotic and abiotic stress responses. Previous studies on the regulation of gpx1, the Citrus sinensis gene encoding phospholipid hydroperoxide isoform, led to the conclusion that salt-induced expression of gpx1 transcript and its encoded protein is mediated by oxidative stress. In this paper, we describe the induction of gpx1 promoter:uidA fusions in stable transformants of tobacco (Nicotiana tabacum) cultured cells and plants. We show that the induction of gpx1 by salt and oxidative stress occurs at the transcriptional level. gpx1 promoter analysis confirmed our previous assumption that the salt signal is transduced via oxidative stress. We used induction of the fusion construct to achieve better insight into, and to monitor salt-induced oxidative stress. The gpx1 promoter responded preferentially to oxidative stress in the form of hydrogen peroxide, rather than to superoxide-generating agents. Antioxidants abolished the salt-induced expression of gpx1 promoter, but were unable to elimin...Continue Reading

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Citations

Jul 9, 2008·Planta·Yardena Gueta-DahanGozal Ben-Hayyim
Dec 6, 2005·Functional & Integrative Genomics·Kanako KawauraYasunari Ogihara
Dec 6, 2011·Acta Crystallographica. Section F, Structural Biology and Crystallization Communications·Larissa C TextorIgor Polikarpov
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Jun 19, 2008·The Plant Journal : for Cell and Molecular Biology·Masaru SakamotoKappei Kobayashi
Jul 12, 2012·The Plant Journal : for Cell and Molecular Biology·Georgia TanouAthanassios Molassiotis
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