State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, Nanjing University, Nanjing 210046, China.
Environmental Science and Engineering PhD program, The University of Texas at El Paso, El Paso, TX 79968, United States; University of California Center for Environmental Implications of Nanotechnology (UC CEIN), The University of Texas at El Paso, El Paso, TX 79968, United States.
Sci Total Environ. 2018 Mar 15;618:306-312. doi: 10.1016/j.scitotenv.2017.11.042. Epub 2017 Nov 10.
The effects of metallic copper nanoparticles (nCu) in plants are not well understood. In this study, soil grown oregano (Origanum vulgare) was exposed for 60days to nCu and Cu microparticles (μCu) at 0-200mgCu/kg. At harvest, Cu accumulation, biomass production, nutrient composition, and Cu fractions in soil were measured. Except for μCu at 50mg/kg, both nCu and μCu increased root Cu (28.4-116.0%) and shoot Cu (83.0-163.0% and 225.4-652.5%, respectively), compared with control. Copper accumulation from μCu increased as the external μCu increased. nCu and μCu did not affect shoot length, malondialdehyde, or chlorophyll, but increased water content (6.9-12.5%) and reduced shoot biomass (21.6-58.5%), compared with control. In addition, at 50mg/kg, μCu decreased root biomass and length (48.6% and 20.5%, respectively) and water content (1.8% and 3.9% at 100 and 200mg/kg, respectively). All treatments modified root and shoot Ca, Fe, Mg, and Mn (p≤0.05). Additionally, all Cu treatments decreased starch (33.9-58.5%), total sugar (39.5-55.7%), and reducing sugar (13.6-33.9%) in leaves. Results showed that metallic Cu nanoparticles/microparticles affected agronomical and physiological parameters in oregano, which could impact human nutrition. However, smaller size particles do not necessarily imply greater toxicity.
金属铜纳米颗粒（nCu）对植物的影响尚不清楚。在这项研究中，土壤中生长的牛至（Origanum vulgare）在 60 天内分别暴露于 nCu 和 Cu 微颗粒（μCu）浓度为 0-200mgCu/kg 的环境中。收获时，测量了 Cu 积累、生物量生产、营养成分以及土壤中 Cu 形态。与对照相比，除了 50mg/kg 的 μCu 之外，nCu 和 μCu 均增加了根 Cu（28.4-116.0%）和茎 Cu（83.0-163.0%和 225.4-652.5%），而 μCu 则随外部 μCu 的增加而增加 Cu 积累。nCu 和 μCu 不影响茎长、丙二醛或叶绿素，但与对照相比，增加了含水量（6.9-12.5%）和减少了茎生物量（21.6-58.5%）。此外，在 50mg/kg 时，μCu 降低了根生物量和长度（分别为 48.6%和 20.5%）和含水量（100mg/kg 和 200mg/kg 时分别为 1.8%和 3.9%）。所有处理均改变了根和茎中的 Ca、Fe、Mg 和 Mn（p≤0.05）。此外，所有 Cu 处理均降低了叶片中的淀粉（33.9-58.5%）、总糖（39.5-55.7%）和还原糖（13.6-33.9%）。结果表明，金属 Cu 纳米颗粒/微颗粒影响了牛至的农艺和生理参数，这可能会影响人类营养。然而，较小的颗粒尺寸并不一定意味着更大的毒性。
