title: Tocopherol content and activities of tyrosine aminotransferase and cystine lyase in Arabidopsis under stress conditions.
abstract: Tocopherols are presumed to be important antioxidants and scavengers of lipid radicals and reactive oxygen species in plants. Age is known to be a condition under which oxidative stress increases. In leaves of aging Arabidopsis thaliana plants, the content of alpha-tocopherol as well as of gamma-tocopherol increased significantly. The activity of tyrosine aminotransferase, which supplies the biosynthetic pathway with 4-hydroxyphenylpyruvate, was increased as well. On the other hand, coronatine, a phytotoxin mimicking octadecanoids and leading to symptoms of senescence, caused a moderate increase in alpha-tocopherol as well as some enhancement of gamma-tocopherol.
authors: Plant Physiology, Faculty of Biology, Ruhr-University, 44870 Bochum, Germany. Heike.Hollaender-Czytko@ruhr-uni-bochum.de
authors: Heike
authors: H
authors: Holländer-Czytko
authors: Janine
authors: J
authors: Grabowski
authors: Iris
authors: I
authors: Sandorf
authors: Katrin
authors: K
authors: Weckermann
authors: Elmar W
authors: EW
authors: Weiler
mesh_terms: D000596:Amino Acids / Q000494:pharmacology; D017360:Arabidopsis / Q000201:enzymology / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000378:metabolism; D013437:Carbon-Sulfur Lyases / Q000037:antagonists & inhibitors / Q000378:metabolism*; D007192:Indenes / Q000494:pharmacology; D018384:Oxidative Stress; D013997:Time Factors; D024505:Tocopherols / Q000378:metabolism*; D014444:Tyrosine Transaminase / Q000037:antagonists & inhibitors / Q000378:metabolism*
chemical_list: D000596:Amino Acids; D029681:Arabidopsis Proteins; D007192:Indenes; C058487:coronatine; D014444:Tyrosine Transaminase; D013437:Carbon-Sulfur Lyases; C105473:L-cysteine-cystine C-S lyase; D024505:Tocopherols