College of Biological Chemical Science and Engineering, Jiaxing University, Jiaxing 314001, PR China; School of Life Science, Linyi University, Linyi 276000, PR China.
School of Life Science, Linyi University, Linyi 276000, PR China.
J Hazard Mater. 2018 Jan 5;341:168-176. doi: 10.1016/j.jhazmat.2017.07.061. Epub 2017 Jul 27.
The wide application and unique properties of graphene oxide (GO) make it to interact with other pollutants and subsequently alter their behavior and toxicity. We evaluated the influences of GO at different concentrations (1 and 5mg/L) on copper (Cu) stress in duckweed (Lemna minor L.) GO below a concentration of 5mg/L showed no adverse effects on L. minor. The addition of Cu above 10μM represented a stress condition, which was evidenced by various parameters such as frond number, percent inhibition of growth rate (I), total chlorophyll content, dry weight, superoxide dismutase (SOD), catalase (CAT), and peroxidase (POD). When L. minor was simultaneously exposed to GO and Cu, especially at a GO concentration of 5mg/L and a Cu level above 10μM, the increase of I and decrease of chlorophyll content were inhibited, suggesting that the Cu stress was diminished in the presence of GO. The addition of Cu alone, ranging between 5 and 20μM, increased Cu, B, Mn, Fe, Co, and Zn uptake, but decreased P uptake. Our results suggest that GO can lessen Cu stress in L. minor via Cu adsorption, thereby protecting the plants from the damaging effects of high Cu concentrations.
氧化石墨烯（GO）的广泛应用和独特性质使其能够与其他污染物相互作用，从而改变它们的行为和毒性。我们评估了不同浓度（1 和 5mg/L）的 GO 对浮萍（Lemna minor L.）的铜（Cu）胁迫的影响。浓度低于 5mg/L 的 GO 对浮萍没有不良影响。超过 10μM 的 Cu 添加代表了一种胁迫条件，这可以通过各种参数来证明，如叶片数、生长率抑制百分比（I）、总叶绿素含量、干重、超氧化物歧化酶（SOD）、过氧化氢酶（CAT）和过氧化物酶（POD）。当浮萍同时暴露于 GO 和 Cu 时，特别是在 GO 浓度为 5mg/L 和 Cu 水平高于 10μM 时，I 的增加和叶绿素含量的减少受到抑制，这表明在存在 GO 的情况下，Cu 胁迫减轻了。单独添加 Cu，浓度在 5 到 20μM 之间，增加了 Cu、B、Mn、Fe、Co 和 Zn 的吸收，但减少了 P 的吸收。我们的结果表明，GO 可以通过 Cu 吸附减轻浮萍中的 Cu 胁迫，从而保护植物免受高浓度 Cu 的破坏作用。
