Tocopherol content and activities of tyrosine aminotransferase and cystine lyase in Arabidopsis under stress conditions.
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.
Holländer-Czytko
Heike
H
Plant Physiology, Faculty of Biology, Ruhr-University, 44870 Bochum, Germany. Heike.Hollaender-Czytko@ruhr-uni-bochum.de
Grabowski
Janine
J
Sandorf
Iris
I
Weckermann
Katrin
K
Weiler
Elmar W
EW
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*
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