Abstract
Tocopherol biosynthesis was investigated in ein3-1, etr1-1 and eto1-1 mutants of Arabidopsis thaliana, which show a defect in ethylene signaling, perception and over-produce ethylene, respectively. A mutation in the EIN3 gene delayed the water-stress related increase in alpha-tocopherol and caused a reduction in the levels of this antioxidant by ca. 30% compared to the wild type. In contrast to the wild type and ein3-1 mutants, both etr1-1 and eto1-1 mutants showed a sharp (up to 5-fold) increase in alpha-tocopherol levels during leaf aging. It is concluded that ethylene perception and signaling may be involved in the regulation of tocopherol biosynthesis during water stress and leaf aging.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Arabidopsis / genetics*
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Arabidopsis / growth & development
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Arabidopsis / metabolism*
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Arabidopsis Proteins / genetics
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DNA-Binding Proteins
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Dehydration / genetics
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Dehydration / metabolism
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Ethylenes / pharmacology*
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Gene Expression Regulation, Plant / drug effects
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Nuclear Proteins / genetics
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Plant Growth Regulators / pharmacology
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Plant Leaves / drug effects
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Plant Leaves / genetics
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Plant Leaves / growth & development
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Plant Leaves / metabolism
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Plants, Genetically Modified
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Receptors, Cell Surface / genetics
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Seedlings / metabolism
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Signal Transduction / drug effects
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Signal Transduction / genetics
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Signal Transduction / physiology*
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Time Factors
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Tocopherols / metabolism*
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Transcription Factors / genetics
Substances
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Arabidopsis Proteins
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DNA-Binding Proteins
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EIN3 protein, Arabidopsis
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ETO1 protein, Arabidopsis
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ETR1 protein, Arabidopsis
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Ethylenes
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Nuclear Proteins
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Plant Growth Regulators
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Receptors, Cell Surface
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Transcription Factors
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ethylene
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Tocopherols