Tocopherol content and activities of tyrosine aminotransferase and cystine lyase in Arabidopsis under stress conditions |
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Authors: | Holländer-Czytko Heike Grabowski Janine Sandorf Iris Weckermann Katrin Weiler Elmar W |
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Institution: | Plant Physiology, Faculty of Biology, Ruhr-University, 44870 Bochum, Germany. Heike.Hollaender-Czytko@ruhr-uni-bochum.de |
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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. |
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Keywords: | Arabidopsis Cystine lyase Senescence Tocopherol Tyrosine aminotransferase |
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