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| DOI：10.13522/j.cnki.ggps.2019357 |
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| The Effects of Zn on Antioxidant Enzymes and Accumulation of Cadmium in Iris Pseudacorus under Cd stress |
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MA Huanhuan, GAO Feng, FAN Xiangyang, HU Chao, CUI Erping, LIU Cuncheng, MO Yu, ZHANG Qian
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1. Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China; 2. Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China; 3. Key Laboratory of High-efficient and Safe Utilization of Agriculture Water Resources of CAAS, Xinxiang 453002, China
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| Abstract: |
| 【Background】Soil contamination by Cd due to anthropogenic activities including application of agrichemicals and mining has become a global environmental concern. In China, the national soil pollution survey bulletin in 2014 showed that the national environment under threat and most pollutions originated from cultivated soils to which soil contamination by heavy metals contributed 7%, despite the cultivated land per capita in China being only 1/3 of the world average. Remediating Cd-contaminated soil is hence more pressing in China than in other countries.【Objective】This paper aims to unveil the mechanisms underlying the change in antioxidant enzymes in Iris pseudacorus under Cd stress in response to Zn concentration and its consequence for Cd accumulation in the plant.【Method】The experiment was conducted in hydroponic culture, where the Cd concentration was spiked to a certain level. We then amended the culture by adding Zn at different concentrations. The changes in antioxidant enzymes and the accumulation of Cd in different tissues in the plant were measured.【Result】①Adding zinc alleviated the stress of Cd on Iris pseudacorus; ②The SOD enzyme in the root was activated earlier than that in the leaves when the plant was under Cd stress; ③Adding zinc increased the POD enzyme activity in the roots, but reduced the POD enzyme activity in the leaves when Zn concentration was in the range of 50~100 mg/L. ④When the Cd concentration was 0.05 mg/L, adding Zn significantly boosted the activity of root CAT enzyme. ⑤The transport coefficients of Cd in the yellow calamus were all higher than unity. When the Cd concentration was 0.05 mg/L, adding Zn significantly increased the enrichment coefficient of Cd in both aboveground and underground parts of Iris pseudacorus.【Conclusion】Under Cd stress, adding Zn improved the antioxidant enzymes and the enrichment coefficient of Cd in Iris pseudacorus. |
| Key words: Iris pseudacorus; antioxidant enzyme system; cadmium; zinc; enrichment coefficient; translocation factor |
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