Ethylene signaling may be involved in the regulation of tocopherol biosynthesis in Arabidopsis thaliana.
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.
Cela
Jana
J
Departament de Biologia Vegetal, Facultat de Biologia, Universitat de Barcelona, Barcelona, Spain.
Falk
Jon
J
Munné-Bosch
Sergi
S
D017360:Arabidopsis / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000235:genetics; D004268:DNA-Binding Proteins; D003681:Dehydration / Q000235:genetics / Q000378:metabolism; D005030:Ethylenes / Q000494:pharmacology*; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D009687:Nuclear Proteins / Q000235:genetics; D010937:Plant Growth Regulators / Q000494:pharmacology; D018515:Plant Leaves / Q000187:drug effects / Q000235:genetics / Q000254:growth & development / Q000378:metabolism; D030821:Plants, Genetically Modified; D011956:Receptors, Cell Surface / Q000235:genetics; D036226:Seedlings / Q000378:metabolism; D015398:Signal Transduction / Q000187:drug effects / Q000235:genetics / Q000502:physiology*; D013997:Time Factors; D024505:Tocopherols / Q000378:metabolism*; D014157:Transcription Factors / Q000235:genetics
D029681:Arabidopsis Proteins; D004268:DNA-Binding Proteins; C106987:EIN3 protein, Arabidopsis; C485242:ETO1 protein, Arabidopsis; C494590:ETR1 protein, Arabidopsis; D005030:Ethylenes; D009687:Nuclear Proteins; D010937:Plant Growth Regulators; D011956:Receptors, Cell Surface; D014157:Transcription Factors; C036216:ethylene; D024505:Tocopherols