title: Function of isoprenoid quinones and chromanols during oxidative stress in plants.
abstract: Isoprenoid quinones and chromanols in plants fulfill both signaling and antioxidant functions under oxidative stress. The redox state of the plastoquinol pool (PQ-pool), which is modulated by interaction with reactive oxygen species (ROS) during oxidative stress, has a major regulatory function in both short- and long-term acclimatory responses. By contrast, the scavenging of ROS by prenyllipids affects signaling pathways where ROS play a role as signaling molecules. As the primary antioxidants, isoprenoid quinones and chromanols are synthesized under high-light stress in response to any increased production of ROS. During photo-oxidative stress, these prenyllipids are continuously synthesized and oxidized to other compounds. In turn, their oxidation products (hydroxy-plastochromanol, plastoquinol-C, plastoquinone-B) can still have an antioxidant function. The oxidation products of isoprenoid quinones and chromanols formed specifically in the face of singlet oxygen, can be indicators of singlet oxygen stress.
authors.affiliation: Department of Plant Physiology and Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387 Kraków, Poland. Electronic address: jerzy.kruk@uj.edu.pl.
authors.forename: Jerzy
authors.initials: J
authors.lastname: Kruk
authors.affiliation: Department of Medical Physics and Biophysics, Faculty of Physics and Applied Computer Science, AGH University of Science and Technology, Reymonta 19, 30-059 Kraków, Poland.
authors.forename: Renata
authors.initials: R
authors.lastname: Szymańska
authors.affiliation: Department of Plant Physiology and Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387 Kraków, Poland.
authors.forename: Beatrycze
authors.initials: B
authors.lastname: Nowicka
authors.affiliation: Department of Plant Physiology and Biochemistry, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387 Kraków, Poland.
authors.forename: Jolanta
authors.initials: J
authors.lastname: Dłużewska
mesh_terms: D000975:Antioxidants / Q000378:metabolism; D001709:Biotechnology; D002839:Chromans / Q000378:metabolism*; D010084:Oxidation-Reduction; D018384:Oxidative Stress; D010944:Plants / Q000378:metabolism*; D010971:Plastoquinone / Q000378:metabolism; D011809:Quinones / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism; D015398:Signal Transduction; D013729:Terpenes / Q000378:metabolism*; D024505:Tocopherols / Q000378:metabolism
chemical_list: D000975:Antioxidants; D002839:Chromans; D011809:Quinones; D017382:Reactive Oxygen Species; D013729:Terpenes; D010971:Plastoquinone; D024505:Tocopherols