Oxidative stress responses in transgenic tobacco containing altered levels of glutathione reductase activity
| العنوان: | Oxidative stress responses in transgenic tobacco containing altered levels of glutathione reductase activity |
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| المؤلفون: | P. Broadbent, Alan R. Wellburn, Philip M. Mullineaux, Gary Creissen, Baldeep Kular |
| المصدر: | The Plant Journal. 8:247-255 |
| بيانات النشر: | Wiley, 1995. |
| سنة النشر: | 1995 |
| مصطلحات موضوعية: | biology, Transgene, Nicotiana tabacum, Glutathione reductase, Cell Biology, Plant Science, Glutathione, biology.organism_classification, medicine.disease_cause, Molecular biology, Cytosol, chemistry.chemical_compound, Paraquat, chemistry, Biochemistry, Genetics, medicine, Solanaceae, Oxidative stress |
| الوصف: | A pea glutathione reductase cDNA was expressed in tobacco. Three classes of construct were used which gave a range of elevated levels of glutathione reductase (GR) activity in the cytosol (GR32), chloroplasts (GR36), or in both chloroplasts and mitochondria (GR46). In some transgenic progeny (T2) from self-fertilized GR32 and GR36 primary transformants, having approximately twofold elevation of GR activity as compared with recessive siblings, there was an amelioration of the effect on leaf discs of up to 15 µM paraquat. However, lines with similarly elevated levels of GR activity showed no decreased sensitivity to the herbicide. None of the GR32 and GR36 lines was less sensitive to ozone. Conversely, T2 progeny of GR46 lines, with greater than 4.5-fold elevations of GR activity, showed no reduced sensitivity to paraquat but two out of four of these lines were less sensitive to ozone fumigation. The differential response to stress co-segregated with the presence of the transgene but there was no relationship between the degree of stress response and the level of GR activity. There was an elevation in the total glutathione pool in all lines showing increased GR activity but there was no change in the ratio of oxidized to reduced glutathione. These results demonstrate that the mechanisms of protection against ozone and paraquat are different although both can be mediated by elevated GR activity. |
| تدمد: | 1365-313X 0960-7412 |
| DOI: | 10.1046/j.1365-313x.1995.08020247.x |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_________::ad6685d04aa66027d8ccab7d6dc323bd https://doi.org/10.1046/j.1365-313x.1995.08020247.x |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi...........ad6685d04aa66027d8ccab7d6dc323bd |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 1365313X 09607412 |
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| DOI: | 10.1046/j.1365-313x.1995.08020247.x |