Abstract
Background and aims
Nickel (Ni) has become a major heavy metal contaminant. The form of nitrogen nutrition remarkably affects IRT1 expression in roots. IRT1 has an activity of transporting Ni2+ into root cells. Therefore, nitrogen-form may affect Ni accumulation and toxicity in plants. The assumption was investigated in this study.
Methods
The Arabidopsis plants were treated in Ni-contained growth solutions with either nitrate (NO3 −) or ammonium (NH4 +) as the sole N source. After 7-day treatments, Ni concentration, IRT1 expression, Ni-induced toxic symptoms and oxidative stress in plants were analyzed.
Results
The NO3 −-fed plants contained a higher Ni concentration, had a greater IRT1 expression in roots, and developed more severe toxic symptoms in the youngest fully expanded leaves, compared with the NH4 +-fed plants. The Ni-induced growth inhibition was also more significant in NO3 −-fed plants. Interestingly, Ni exposure resulted in greater hydrogen peroxide (H2O2) and superoxide radical (O2 . −) accumulations, more severe lipid peroxidation and more cell death in NO3 −-fed plants, whereas the opposite was true for NH4 +-fed plants. Furthermore, the Ni-enhanced peroxidase (POD) and superoxide dismutase (SOD) activities were greater in NO3 −-fed plants
Conclusion
NO3 − nutrition promotes Ni uptake, and enhances Ni-induced growth inhibition and oxidative stress in plants compared with NH4 + nutrition.
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Abbreviations
- NH4 + :
-
ammonium
- H2O2 :
-
hydrogen peroxide
- MDA:
-
malondialdehyde
- Ni:
-
nickel
- NO3 − :
-
nitrate
- O2 . − :
-
superoxide radical
- POD:
-
peroxidase
- SOD:
-
superoxide dismutase
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Acknowledgments
This work was financially supported by Natural Science Foundation of China (Grant No. 31270041), the Department of Science & Technology of Zhejiang Province (2011C22077). Innovation Research Training Programme of Zhejiang Province for College Students.
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Yan Hu, Nai Shan Wang and Xu Jun Hu contributed equally to this work.
Responsible Editor: Juan Barcelo.
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Hu, Y., Wang, N.S., Hu, X.J. et al. Nitrate nutrition enhances nickel accumulation and toxicity in Arabidopsis plants. Plant Soil 371, 105–115 (2013). https://doi.org/10.1007/s11104-013-1682-4
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DOI: https://doi.org/10.1007/s11104-013-1682-4