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Abstract
To evaluate the effects of exogenous selenium on cadmium tolerance and accumulation in two varieties of cucumber, pot experiments with cadmium at 10 mg/kg soil were conducted. Plant biomass, cadmium bioaccumulation, cadmium speciation, and antioxidative enzyme activity, including superoxide dismutase, catalase, peroxidase, and ascorbate peroxidase were determined. Exogenous selenium (1 mg/L for S1 and 2 mg/L for S2) was sprayed on the leaves on cucumbers, which significantly increased the biomasses of the roots, stems, leaves, and fruits in both cucumber varieties. The cadmium bioaccumulation in the cucumbers decreased with the increase of selenium. The contents of pectate/protein-bound cadmium increased and the cadmium − organic acid complexes and inorganic cadmium tended to decrease with the selenium addition. Supplementation with selenium improved the activities of superoxide dismutase, peroxidase, catalase, and ascorbate peroxidase in the two cucumber varieties.
Author contributions
Jiang, P. P. and J. Liu: conceived the study; Chen, M. H. and S. H. You: performed statistical analyses and literature review; Jiang, P.P. and S. H. You: collected data and prepared the data for analysis; Chen, M. H. and G. Yu: performed statistical analyses and literature review; Jiang, P. P.: wrote the main manuscript text; Yu, G., S. H. You and J. Y. Li: improved the draft; All authors contributed to the interpretation of results and revised the manuscript critically; All authors approved the final manuscript.
Disclosure statement
No potential conflict of interest was reported by the author(s).