Tocopherol content and activities of tyrosine aminotransferase and cystine lyase in Arabidopsis under stress conditions.

Heike Holländer-Czytko, Janine Grabowski, Iris Sandorf, Katrin Weckermann, Elmar W Weiler

Plant Physiology, Faculty of Biology, Ruhr-University, 44870 Bochum, Germany. Heike.Hollaender-Czytko@ruhr-uni-bochum.de

Journal of plant physiology 2005 Jul

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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.

Citation

Heike Holländer-Czytko, Janine Grabowski, Iris Sandorf, Katrin Weckermann, Elmar W Weiler. Tocopherol content and activities of tyrosine aminotransferase and cystine lyase in Arabidopsis under stress conditions. Journal of plant physiology. 2005 Jul;162(7):767-70