Abstract
Wheat (Triticum aestivum L.) has relatively high tolerance to cadmium (Cd), but the underlying mechanisms are poorly understood. Growth and physiological parameters of wheat exposed to different Cd concentrations (0, 0.5, 5 and 50 µM) were characterized. The fresh weight, leaf chlorophyll and carotenoid concentrations and photosynthesis parameters did not differ among Cd treatments, suggesting relatively high Cd tolerance in wheat. However, the soluble sugar concentrations increased with the increasing Cd concentration and the soluble protein concentrations decreased in both shoots and roots, suggesting that the Cd application promoted nitrogen metabolism over carbon metabolism. In addition, the higher concentrations of MDA, GSH and AsA and activities of antioxidant enzymes (SOD, POD, and CAT) were observed in leaves and roots in the Cd50 treatment. Our results reveal that wheat can tolerate Cd by enhancing the antioxidant enzymes activities and increasing the concentration of ascorbate and glutathione.
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Acknowledgements
We thank Prof. Zed Rengel (University of Western Australia, Australia) for critical reviewing and revision of the manuscript. This work was financially supported by the Doctoral Scientific Research Foundation of Henan Agricultural University (Grant No. 30500592), National Key R&D Program of China (Grant No. 2017YFD0201700), and Henan Province Science and Technology Research Project (Grant No. 172102110060).
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Qin, S., Liu, H., Nie, Z. et al. AsA–GSH Cycle and Antioxidant Enzymes Play Important Roles in Cd Tolerance of Wheat. Bull Environ Contam Toxicol 101, 684–690 (2018). https://doi.org/10.1007/s00128-018-2471-9
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DOI: https://doi.org/10.1007/s00128-018-2471-9