NDLI: The glutathione peroxidase homologous gene Gpxh in Chlamydomonas reinhardtii is upregulated by singlet oxygen produced in photosystem II

Content Provider	Springer Nature Link
Author	Fischer, Beat B. Eggen, Rik I. L. Trebst, Achim Krieger Liszkay, Anja
Copyright Year	2005
Abstract	The expression of the glutathione peroxidase homologous gene Gpxh, known to be specifically induced by the formation of singlet oxygen (1O2), was analyzed in cells of Chlamydomonas reinhardtii exposed to environmental conditions causing photoinhibition. Illumination with high light intensities, leading to an increased formation of 1O2 in photosystem II, continuously induced the expression of Gpxh in cell for at least 2 h. Phenolic herbicides like dinoterb, raise the rate of 1O2 formation by increasing the probability of charge recombination in photosystem II via the formation of the primary radical pair and thereby 3P680 formation (Fufezan C et al. 2002, FEBS Letters 532, 407–410). In the presence of dinoterb the light-induced loss of the D1 protein in C. reinhardtii was increased and the high light-induced Gpxh expression was further stimulated. DCMU, a urea-type herbicide, causing reduced 1O2 generation in photosystem II, protected the D1 protein slightly against degradation and downregulated the expression of the Gpxh gene compared to untreated cells exposed to high light intensities. This indicates that the Gpxh expression is induced by 1O2 under environment conditions causing photoinhibition.
Starting Page	583
Ending Page	590
Page Count	8
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	223
Issue Number	3
e-ISSN	14322048
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-09-14
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Photooxidative stress Photosystem II Singlet oxygen Herbicides Spin-trapping EPR Forestry Ecology Agriculture Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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