College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, Harbin, 150040, China; Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, Harbin, 150040, China.
College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, Harbin, 150040, China; Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, Harbin, 150040, China.
Environ Pollut. 2024 Aug 1;354:124188. doi: 10.1016/j.envpol.2024.124188. Epub 2024 May 20.
Cadmium is the most prevalent heavy metal pollutant in the environment and can be readily combined with micro/nanoplastics (M/NPs) to change their bioavailability. In the present study, we comprehensively investigated the effect of polystyrene (PS) NPs on dandelion plants grown under Cd stress. Cd exposure significantly inhibited the growth of dandelion seedlings, resulting in a decrease in seedling elongation from 26.47% to 28.83%, a reduction in biomass from 29.76% to 54.14%, and an exacerbation of lipid peroxidation and oxidative stress. The interaction between PS NPs and Cd resulted in the formation of larger aggregates, with the Cd bioavailability reduced by 12.56%. PS NPs affect ion absorption by regulating reactive oxygen production and increasing superoxide dismutase activity, thereby mitigating the adverse effects of Cd. PSCd aggregates induced significant changes in the metabolic profiles of dandelions, affecting various carbohydrates related to alcohols, organic acids, sugar metabolism, and bioactive components related to flavonoids and phenolic acids. Furthermore, based on a structural equation model, exposure to PSCd activated oxidative stress and nutrient absorption, thereby affecting plant growth and Cd accumulation. Overall, our study provides valuable insights into the effects of PS NPs on Cd bioavailability, accumulation, and plant growth, which are crucial for understanding the food safety of medicinal plants in a coexistence environment.
镉是环境中最普遍的重金属污染物，很容易与微/纳米塑料（M/NPs）结合，从而改变它们的生物利用度。在本研究中，我们全面研究了聚苯乙烯（PS）NPs 在镉胁迫下对蒲公英植物的影响。Cd 暴露显著抑制了蒲公英幼苗的生长，导致幼苗伸长率从 26.47%下降到 28.83%，生物量从 29.76%下降到 54.14%，脂质过氧化和氧化应激加剧。PS NPs 和 Cd 的相互作用导致形成更大的聚集体，Cd 的生物利用度降低了 12.56%。PS NPs 通过调节活性氧的产生和增加超氧化物歧化酶的活性来影响离子吸收，从而减轻 Cd 的不利影响。PSCd 聚集体诱导蒲公英的代谢谱发生显著变化，影响与醇、有机酸、糖代谢相关的各种碳水化合物以及与类黄酮和酚酸相关的生物活性成分。此外，基于结构方程模型，PSCd 的暴露激活了氧化应激和养分吸收，从而影响植物的生长和 Cd 的积累。总的来说，我们的研究提供了有价值的见解，了解 PS NPs 对 Cd 生物利用度、积累和植物生长的影响，这对于理解共存环境中药用植物的食品安全至关重要。
