Abstract
Plant glutathione S-transferases (GSTs) are involved in protecting plants against both diverse biotic and abiotic stresses. In the present study, a novel GST gene (LbGST1) was cloned from Limonium bicolor (Bunge) Kuntze (Plumbaginaceae). To characterize its function in salt tolerance, tobacco lines transformed with LbGST1 were generated. Compared with wild-type (WT) tobacco, transgenic plants overexpressing LbGST1 exhibited both GST and glutathione peroxidase activities. Moreover, superoxide dismutase, peroxidase (POD), and catalase activities in transgenic plants were significantly higher than those in WT plants, particularly when grown under conditions of salt stress. Similarly, levels of proline in transgenic plants were also higher than those in WT plants grown under NaCl stress conditions. Whereas, Malondialdehyde contents in transgenic plants were lower than those in WT plants under NaCl conditions. Furthermore, Na+ content in transgenic plants was lower than that in WT plants under these stress conditions. Subcellular localization analysis revealed that the LbGST1 protein was localized in the nucleus. These results suggested that overexpression of LbGST1 gene can affect many physiological processes associated with plant salt tolerance. Therefore, we hypothesize that LbGST1 gene can mediate many physiological pathways that enhance stress resistance in plants.
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Abbreviations
- bp:
-
base pair
- CAT:
-
catalase
- GPX:
-
glutathione peroxidase
- GST:
-
gluthathione S-transferase
- GFP:
-
green fluorescent protein
- MDA:
-
malondialdehyde
- RLG:
-
relative rate of length growth
- PCR:
-
polymerase chain reaction
- POD:
-
peroxidase
- SOD:
-
superoxide dismutase
- WT:
-
wild type
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Acknowledgments
This work has been supported by Program for New Century Excellent Talents in University (NCET-08-0751), Foundation for the Author of National Excellent Doctoral Dissertation of China (200973), and Science foundation of Northeast Forestry University (09040).
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Diao, G., Wang, Y., Wang, C. et al. Cloning and Functional Characterization of a Novel Glutathione S-Transferase Gene from Limonium bicolor . Plant Mol Biol Rep 29, 77–87 (2011). https://doi.org/10.1007/s11105-010-0212-2
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DOI: https://doi.org/10.1007/s11105-010-0212-2