Liu Zhouli, Tian Lei, Chen Mengdi, Zhang Luhua, Lu Qingxuan, Wei Jianbing, Duan Xiangbo
Liaoning Key Laboratory of Urban Integrated Pest Management and Ecological Security, College of Life Science and Engineering, Shenyang University, Shenyang 110044, China.
Northeast Geological S&T Innovation Center of China Geological Survey, Shenyang 110000, China.
Plants (Basel). 2023 Feb 18;12(4):933. doi: 10.3390/plants12040933.
"Hormesis" is considered a dose-response phenomenon mainly observed at hyperaccumulator plants under heavy metals stress. In this study, the effects of electric fields on hormesis responses in Thunb. under cadmium (Cd) treatments were investigated by assessing the plant growth and photosynthetic characteristics. Under Cd treatments without electric fields, the parameters of plant growth and photosynthetic characteristics increased significantly when exposed to 5 mg L Cd, and decreased slightly when exposed to 25 mg L Cd, showing an inverted U-shaped trend, which confirmed that low concentration Cd has a hormesis effect on . Under electric fields, different voltages significantly promoted the inverted U-shaped trend of the hormesis effect on the plant, especially by 2 V cm voltage. Under 2 V cm voltage, the dry weight of the root and leaf biomass exposed to 5 mg L Cd increased significantly by 38.38% and 42.14%, and the photosynthetic pigment contents and photosynthetic parameters were also increased significantly relative to the control, indicating that a suitable electric field provides better improvements for the hormesis responses of the plant under Cd treatments. The synergistic benefits of the 5 mg L Cd and 2 V cm electric field in terms of the enhanced hormesis responses of growth and photosynthetic characteristics could contribute to the promoted application of electro-phytotechnology.
“兴奋效应”被认为是一种主要在重金属胁迫下的超积累植物中观察到的剂量反应现象。在本研究中，通过评估植物生长和光合特性，研究了电场对镉（Cd）处理下的海州香薷兴奋效应反应的影响。在无电场的镉处理下，当暴露于5mg/L镉时，植物生长和光合特性参数显著增加，而当暴露于25mg/L镉时略有下降，呈现倒U形趋势，这证实了低浓度镉对海州香薷有兴奋效应。在电场作用下，不同电压显著促进了对植物兴奋效应的倒U形趋势，尤其是2V/cm的电压。在2V/cm电压下，暴露于5mg/L镉的根和叶生物量干重分别显著增加了38.38%和42.14%，光合色素含量和光合参数相对于对照也显著增加，表明合适的电场对镉处理下植物的兴奋效应反应有更好的改善作用。5mg/L镉和2V/cm电场在增强生长和光合特性的兴奋效应反应方面的协同效益，可能有助于促进电植物技术的应用。
