Hydrogen Peroxide-dependent Synthesis of Flavonols in Mesophyll Cells of Vicia faba L. |
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Authors: | Takahama Umeo; Egashira Takeshi; Wakamatsu Kunimitsu |
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Institution: | 1Department of Biology, Kyushu Dental College Kitakyushu, 803 Japan
2Department of Biology, Fukuoka Women's University Fukuoka, 813 Japan |
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Abstract: | Mesophyll cells of Vicia faba contain kaempferol and quercetinglycosides. When isolated mesophyll cells were treated with0.1 mM H2O2 for 2 h, the levels of these flavonols increasedby 1070% of the control values (mean values, 19.6% and34.4% for kaempferol and quercetin glycosides, respectively).Such increases in levels of flavonols were also observed inisolated vacuoles of mesophyll cells. However, when mesophyllcells and vacuoles were treated with 10 mM H2O2)degradationof flavonols was observed. These data suggest that H2O2 hastwo effects on the metabolism of flavonols: induction of theirsynthesis and stimulation of their oxidation. (Received March 6, 1989; Accepted July 10, 1989) |
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