Abstract
Background and aims
Cadmium (Cd) could activate activity of mitogen-activated protein kinase MPK6 in plants. In this study, we investigated the role of MPK6 in mediating Cd toxicity in plants.
Methods
The wild type Arabidopsis plants (WT) and the mpk6-2 mutants were subjected either 0 (Control) or 10 μM Cd treatment. Kinase activity of MPK6, nitric oxide (NO) level, Cd concentration, and oxidative stress were measured.
Results
In WT plants, Cd exposure rapidly stimulated kinase activity of MPK6. However, upon Cd exposure, mpk6-2 showed better growth than the WT. Although Cd-induced production of NO in roots was greater in WT than in mpk6-2, there was no difference in Cd concentration between the two plants. Nevertheless, the Cd-induced hydroperoxide burst, lipid peroxidation and loss of membrane integrity, were all more severe in the WT than in mpk6-2. Foliar applications of antioxidant ascorbic acid, vigorously improved the growth of both the WT and mpk6-2 under Cd exposure. Thereby the growth difference between these two plants was minimized.
Conclusions
Mutation of mpk6 enhances Cd tolerance in plants by alleviating oxidative stress, but did not affect cadmium accumulation in plants.
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Acknowledgments
This work was financially supported by the Natural Science foundation of China (Grant Nos 31270041, 30900170), the Zhejiang Province Natural Science Foundation (No.Y5090106). We thank Professor Jianhua Zhang (Chinese University of Hong Kong, Hong Kong) for kindly providing mpk6-3 mutant seeds.
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Jin, CW., Mao, QQ., Luo, BF. et al. Mutation of mpk6 enhances cadmium tolerance in Arabidopsis plants by alleviating oxidative stress. Plant Soil 371, 387–396 (2013). https://doi.org/10.1007/s11104-013-1699-8
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DOI: https://doi.org/10.1007/s11104-013-1699-8