Department of Civil and Environmental Engineering, Shantou University, No. 243 Daxue Road, Shantou, 515063, China.
School of Environmental Science and Engineering, Tianjin Polytechnic University, Tianjin, 300387, China.
Environ Sci Pollut Res Int. 2021 Jul;28(26):34344-34354. doi: 10.1007/s11356-021-13024-3. Epub 2021 Mar 1.
A detailed study of nanomaterials has revealed their broad application prospects. However, the presence of carbon nanotubes (CNTs) in the environment has been increasing and has aroused concerns regarding their toxicity to crops when combined with heavy metals. In the present study, the effects of Cd on the photosynthetic capacity and antioxidant activity of wheat seedlings in the presence of single-walled CNTs (SW) and multi-walled CNTs (MW) were investigated. Our results indicated that SW (5-40 mg L) and MW (10-40 mg L) significantly increased the oxidative stress response of wheat seedlings to Cd. Compared with Cd alone, CNTs combined with Cd decreased net photosynthetic rate, stomatal conductance, transpiration rate, primary maximum photochemical efficiency of photosystem II, actual quantum yield, photosynthetic electron transport rate, root canal protein, and ribulose-1,5-bisphosphate carboxylase/oxygenase content. Moreover, combined treatments increased the content of superoxide anion, superoxide dismutase, guaiacol peroxidase, cytochrome, and malondialdehyde in wheat seedlings. Moreover, membrane lipid peroxidation was aggravated, causing serious damage to the wheat membrane system. In addition, the toxicity of the SW treatment and the combined treatment with SW and Cd was higher than that of the MW treatment.
对纳米材料的详细研究揭示了它们广泛的应用前景。然而，环境中碳纳米管（CNTs）的存在一直在增加，并且当与重金属结合时，它们对农作物的毒性引起了人们的关注。在本研究中，研究了单壁碳纳米管（SW）和多壁碳纳米管（MW）存在时 Cd 对小麦幼苗光合能力和抗氧化活性的影响。我们的结果表明，SW（5-40mg/L）和 MW（10-40mg/L）显著增加了小麦幼苗对 Cd 的氧化应激反应。与单独的 Cd 相比，CNTs 与 Cd 结合降低了净光合速率、气孔导度、蒸腾速率、光系统 II 的原初最大光化学效率、实际量子产量、光合电子传递速率、根管蛋白和核酮糖-1,5-二磷酸羧化酶/加氧酶含量。此外，联合处理增加了小麦幼苗中超氧阴离子、超氧化物歧化酶、愈创木酚过氧化物酶、细胞色素和丙二醛的含量。此外，膜脂过氧化加剧，导致小麦膜系统受到严重损害。此外，SW 处理和 SW 与 Cd 联合处理的毒性高于 MW 处理。
