Dehydroascorbate and glutathione regulate the cellular development of <Emphasis Type="Italic">Nicotiana tabacum</Emphasis> L. SR-1 protoplasts |
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| Authors: | Geert Potters Marcel A K Jansen Nele Horemans Yves Guisez Taras Pasternak |
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| Institution: | 1.Department of Bioscience Engineering,University of Antwerp,Antwerp,Belgium;2.Department of Plant Sciences (ZEPS),University College Cork,Cork,Ireland;3.Biosphere Impact Studies,Belgian Nuclear Research Centre (SCK?CEN),Mol,Belgium;4.Department of Biology,University of Antwerp,Antwerp,Belgium;5.Institut für Biologie II & Zentrum für Angewandte Biowissenschaften,University of Freiburg,Freiburg,Germany |
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| Abstract: | A Nicotiana tabacum L. SR-1 leaf protoplast system was used to study the effects of dehydroascorbate and glutathione on cellular development.
We found that dehydroascorbate is readily taken up by protoplasts and internally reduced to ascorbate. Concomitantly, cell
division was inhibited and cell expansion stimulated. In this respect, dehydroascorbate counteracted auxin-mediated leaf protoplast
development. In contrast to the effects of dehydroascorbate, glutathione-induced cell dedifferentiation, and this effect is
similar to that mediated by high auxin concentrations. We conclude that dehydroascorbate and glutathione affect the auxin-mediated
regulation of cellular development. Therefore, the biological role of these compounds extends beyond stress tolerance and
defense. |
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