MOE Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China.
MOE Key Laboratory of Pollution Processes and Environmental Criteria, Tianjin Key Laboratory of Urban Ecology Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300350, China.
J Environ Manage. 2020 Dec 15;276:111328. doi: 10.1016/j.jenvman.2020.111328. Epub 2020 Sep 12.
Phytoremediation enhanced by electrokinetic has been considered as a potential technology for remediating contaminated soils. However, the effects of electric fields on Cd accumulation and photosynthesis in Zea mays (as a cathode) is still unclear. In the present study, Zea mays seedlings were exposed to various doses of Cd (10, 50, 100 μM) to explore the impact of electric fields on Cd accumulation and photosynthesis of Zea mays. Results showed that upon exposure to a concentration of 100 μM Cd, electric fields significantly altered the Cd contents in maize shoots, whereas the concentration of 50 μM Cd increased the Cd contents in maize roots as well as affected the Cd transport from roots to shoots. Uptake index (UI) increased by 1.34%-66.16% with the application of electric fields. The variation of photosynthetic rates attributed to the open or closure of stoma was similar to the change of shoot fresh weight, particularly in maize exposed to high Cd stress. This study proposes a new technology in Cd phytoremediation and provides important information on physiological processes in maize when exposed to Cd stress and electric fields.
电动力学增强的植物修复技术被认为是一种修复污染土壤的潜在技术。然而，电场对玉米（作为阴极）中镉积累和光合作用的影响尚不清楚。本研究采用不同浓度的 Cd（10、50、100 μM）处理玉米幼苗，探讨电场对玉米镉积累和光合作用的影响。结果表明，在 100 μM Cd 浓度下，电场显著改变了玉米地上部分的 Cd 含量，而 50 μM Cd 浓度增加了玉米根部的 Cd 含量，并影响了 Cd 从根部向地上部分的运输。施加电场后，玉米的吸收指数（UI）增加了 1.34%至 66.16%。光合作用速率的变化归因于气孔的开放或关闭，这与地上部分鲜重的变化相似，特别是在玉米受到高 Cd 胁迫时。本研究提出了一种新的 Cd 植物修复技术，并为玉米在 Cd 胁迫和电场下的生理过程提供了重要信息。
