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.

中文翻译：

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外源硒提高黄瓜对镉胁迫的生理抗性

摘要 为了评价外源硒对两个品种黄瓜镉耐受性和积累的影响，进行了镉浓度为10 mg/kg土壤的盆栽试验。测定了植物生物量、镉生物积累、镉形态和抗氧化酶活性，包括超氧化物歧化酶、过氧化氢酶、过氧化物酶和抗坏血酸过氧化物酶。在黄瓜叶片上喷洒外源硒（S1 为 1 mg/L，S2 为 2 mg/L），这显着增加了两种黄瓜品种的根、茎、叶和果实的生物量。黄瓜中镉的生物蓄积量随着硒的增加而减少。随着硒的加入，果胶酸/蛋白质结合镉的含量增加，镉-有机酸复合物和无机镉的含量趋于减少。