title: Role of singlet oxygen in chloroplast to nucleus retrograde signaling in Chlamydomonas reinhardtii.
abstract: High light illumination of photosynthetic organisms stimulates the production of singlet oxygen by photosystem II and causes photooxidative stress. In Chlamydomonas reinhardtii, singlet oxygen also induces the expression of the nuclear-encoded glutathione peroxidase homologous gene GPXH. We provide evidence that singlet oxygen stimulates GPXH expression by activating a signaling mechanism outside the thylakoid membrane. Singlet oxygen from photosystem II could be detected with specific probes in the aqueous phase of isolated thylakoid suspensions and the cytoplasm of high light stressed cells. This indicates that singlet oxygen can stimulate a response farther from its production site than generally believed.
authors.affiliation: Department of Environmental Toxicology, Eawag, Swiss Federal Institute of Aquatic Science and Technology, Ueberlandstrasse 133, 8600, Dübendorf, Switzerland.
authors.forename: Beat B
authors.initials: BB
authors.lastname: Fischer
authors.forename: Anja
authors.initials: A
authors.lastname: Krieger-Liszkay
authors.forename: Eva
authors.initials: E
authors.lastname: Hideg
authors.forename: Iva
authors.initials: I
authors.lastname: Snyrychová
authors.forename: Manuela
authors.initials: M
authors.lastname: Wiesendanger
authors.forename: Rik I L
authors.initials: RI
authors.lastname: Eggen
mesh_terms: D000818:Animals; D002467:Cell Nucleus / Q000378:metabolism*; D016825:Chlamydomonas reinhardtii / Q000235:genetics / Q000378:metabolism*; D002736:Chloroplasts / Q000378:metabolism*; D005979:Glutathione Peroxidase / Q000235:genetics / Q000378:metabolism; D008027:Light; D045332:Photosystem II Protein Complex / Q000378:metabolism; D012395:Rose Bengal / Q000737:chemistry / Q000378:metabolism; D015398:Signal Transduction; D026082:Singlet Oxygen / Q000378:metabolism*; D019097:Spin Trapping
chemical_list: D045332:Photosystem II Protein Complex; D026082:Singlet Oxygen; D012395:Rose Bengal; D005979:Glutathione Peroxidase