State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China.
State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China; Shangtex Architectural Design Research Institute, Shanghai, 200060, China.
Chemosphere. 2019 May;222:399-406. doi: 10.1016/j.chemosphere.2019.01.119. Epub 2019 Jan 29.
Nickel contamination may lead to the destruction of food, ecological safety and its toxicity to plants remains to be studied in depth. In our present study, the translocation factors (TF and TF) revealed a significant logarithmic decline with the increase of Ni exposure. In lettuce roots, Ni played an important protective role against high Ni stress and the ratio of Ni with high activity (Ni and Ni) in root decreased with the addition of Ni. The activities of antioxidant enzymes (CAT, POD and SOD) in the lettuce roots were increased and might be the way for lettuce to adapt Ni stress. CAT and POD can be great indicators of Ni pollution exhibiting better dose-effect relationships with Ni. Under high Ni stress, lettuce roots contained higher levels of MDA suffering greater pressure than shoots. Expression levels of gene GST 23-like indicated a remarkable (P < 0.05) down-regulation and then this trend would be alleviated after high Ni exposure, and it was positively correlated with GST concentrations (R = 0.704). We believe that our research would open up the new avenues for effective understanding ecological risks of Ni.
镍污染可能导致食物破坏，其对植物的生态安全性和毒性仍需深入研究。在本研究中，转运因子（TF 和 TF）随着镍暴露的增加呈显著对数下降。在生菜根中，镍对高镍胁迫起到了重要的保护作用，且高活性镍（Ni 和 Ni）在根中的比例随着镍的添加而降低。生菜根中的抗氧化酶（CAT、POD 和 SOD）活性增加，这可能是生菜适应镍胁迫的一种方式。CAT 和 POD 可以作为镍污染的良好指标，与镍的剂量效应关系更好。在高镍胁迫下，生菜根中 MDA 的含量高于地上部分，表明生菜根受到的压力更大。GST 23 样基因的表达水平显著下调（P < 0.05），然后在高镍暴露后这种趋势会得到缓解，并且与 GST 浓度呈正相关（R = 0.704）。我们相信，我们的研究将为有效理解镍的生态风险开辟新途径。
