Key Laboratory of Pollution Control Chemistry and Environmental Functional Materials for Qinghai-Tibet Plateau of the National Ethnic Affairs Commission and Key Laboratory of General Chemistry of the National Ethnic Affairs Commission, School of Chemistry and Environment, Southwest Minzu University, Chengdu 610041, China.
School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China.
Ecotoxicol Environ Saf. 2022 Sep 1;242:113885. doi: 10.1016/j.ecoenv.2022.113885. Epub 2022 Jul 15.
Vanadium dioxide nanoparticles (VO NPs) have been massively produced due to their excellent metal-insulator transition characteristics for various applications. Pilot studies indicated the toxicity of VO NPs to bacteria and mammalian cells, but the environmental hazards of VO NPs to plants have been unrevealed to date. In this study, we reported the inhibitive effects of VO NPs to the growth and photosynthesis of pea seedlings. Laboratory synthesized monoclinic VO NPs (N-VO), commercial nanosized VO NPs (S-VO), and commercial microsized VO particles (M-VO) were carefully characterized for environmental toxicity evaluations. VO particles were supplemented to culture medium for seed germination and seedling growth. All three VO samples did not affect the germination rates of pee seeds, while serious growth inhibition of pea seedlings was observed at 10 mg/L for S-VO and N-VO, and 100 mg/L for M-VO. VO particles had no impact on the chlorophyll contents, but the photosynthesis of leaf was significantly decreased following the consequence of N-VO > S-VO > M-VO. The inhibition of photosynthesis was attributed to the damage of acceptor side of photosystem II by VO particles at high concentrations. Abundant bioaccumulations of vanadium in roots aroused oxidative damage and changed the root structure. Our results collectively indicated that the phytotoxicity of VO NPs was related to the concentration, size and crystalline degree.
二氧化钒纳米粒子（VO NPs）因其具有优异的金属-绝缘体转变特性，已被大量生产，可应用于各种领域。初步研究表明，VO NPs 对细菌和哺乳动物细胞具有毒性，但迄今为止，其对植物的环境危害尚未被揭示。在本研究中，我们报道了 VO NPs 对豌豆幼苗生长和光合作用的抑制作用。实验室合成的单斜晶 VO NPs（N-VO）、商业纳米级 VO NPs（S-VO）和商业微米级 VO 颗粒（M-VO）经过精心表征，用于环境毒性评估。将 VO 颗粒添加到培养基中进行种子萌发和幼苗生长实验。三种 VO 样品均不影响豌豆种子的发芽率，但 S-VO 和 N-VO 的 10mg/L 以及 M-VO 的 100mg/L 浓度显著抑制了豌豆幼苗的生长。VO 颗粒对叶绿素含量没有影响，但光合作用明显下降，其抑制作用为 N-VO＞S-VO＞M-VO。光合作用的抑制归因于高浓度 VO 颗粒对光系统 II 受体侧的破坏。大量的钒在根中积累，引起氧化损伤并改变了根的结构。我们的研究结果表明，VO NPs 的植物毒性与浓度、尺寸和结晶度有关。
