Abstract
The effects of long-term NaCl and KCl treatment on plant growth and antioxidative responses were investigated in Chenopodium album, a salt-resistant species widely distributed in semi-arid and light-saline areas of Xinjiang, China. Growth parameters [plant height, branch number, leaf morphology and chlorophyll (Chl) content], the level of oxidative stress [superoxide anion radical (O2 −), hydrogen peroxide (H2O2) and malondialdehyde (MDA) concentrations], activity of antioxidant enzymes [superoxide dismutase (SOD), catalase (CAT), peroxidase (POX)], the contents of non-enzymatic antioxidants [carotenoids (Car) and ascorbic acid (AsA)] and expression of selected genes were investigated. Plants were grown in the presence of 0, 50, and 300 mM NaCl or KCl for 2 months. Growth was stimulated by 50 mM NaCl or KCl, maintained stable at 300 mM NaCl, but was inhibited by 300 mM KCl. Three hundred mM NaCl did not affect O2 −, H2O2, MDA, Car and AsA, but increased the activities of SOD, CAT and POX compared to the controls. RT-PCR analysis suggested that expression of some genes encoding antioxidant enzymes could be induced during long-term salt stress, which was consistent with the enzyme activities. Treatment with 300 mM KCl was associated with elevated oxidative stress, and significantly decreased Car and AsA contents. These results suggest that an efficient antioxidant machinery is important for overcoming oxidative stress induced by treatment with high NaCl concentrations in C. album. Other strategies of ion regulation may also contribute to the differential tolerance to Na and K at higher concentrations.
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Abbreviations
- AsA:
-
Ascorbic acid
- Car:
-
Carotenoids
- CAT:
-
Catalase
- Chl:
-
Chlorophyll
- H2O2 :
-
Hydrogen peroxide
- MDA:
-
Malondialdehyde
- NBT:
-
Nitroblue tetrazolium
- O2 − :
-
Superoxide anion radical
- POX:
-
Peroxidase
- ROS:
-
Reactive oxygen species
- RuBisCo:
-
Ribulose-1,5-bisphosphate carboxylase/oxygenase
- RuBisCo activase:
-
Ribulose-1,5-bisphosphate carboxylase/oxygenase activase
- SOD:
-
Superoxide dismutase
- TBA:
-
Thiobarbituric acid
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (No.30660012), the Xinjiang Municipal Major Science and Technology Project (200731138-3) and the Open Fund of the Xinjiang Key Laboratory of Biological Resources and Genetic Engineering (XJDX0201-2007-03) (XJDX0201-2009-06).
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Yao, S., Chen, S., Xu, D. et al. Plant growth and responses of antioxidants of Chenopodium album to long-term NaCl and KCl stress. Plant Growth Regul 60, 115–125 (2010). https://doi.org/10.1007/s10725-009-9426-4
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DOI: https://doi.org/10.1007/s10725-009-9426-4