Short-duration exposure of 3-μm polystyrene microplastics affected morphology and physiology of watermilfoil (sp. roraima)
Short-duration exposure of 3-μm polystyrene microplastics affected morphology and physiology of watermilfoil (sp. roraima)
复制标题
短时间暴露于 3 μm 聚苯乙烯微塑料会影响水母叶 (sp. roraima) 的形态和生理学
DOI：
10.1007/s11356-022-18642-z
复制
发表时间：
2022
影响因子：
5.8
通讯作者：
Fujino Takeshi
中科院分区：
文献类型：
--
作者：
Senavirathna Mudalige Don Hiranya Jayasanka;Zhaozhi Liu;Fujino Takeshi
微塑料是全球讨论最广泛的环境问题之一。一些研究表明了微塑料暴露对海洋环境的影响;然而，缺乏对淡水系统的研究。本研究旨在探讨微塑料对水培挺水植物水苋（sp.roraima）在受控环境条件下的影响。将植物暴露于0 mg L−1（对照）、0.05 mg L −1、0.25 mg L−1、1.25 mg L−1和6 mg L− 1的3 µm聚苯乙烯微球中7天。分别分析了水体上部和水体下部的氧化应激、抗氧化反应、色素沉着、Fv/Fm和生长参数。进行显微镜观察以确认微塑料的组织吸收。接触微塑料改变了一些参数;然而，生长没有受到影响。对于大多数参数，微塑料的影响与接触浓度不呈线性关系，浓度在1.25至6 mg L− 1之间。响应趋势主要遵循二阶多项式分布。在1.25 mg L-1浓度下，根长、H2 O2含量、过氧化氢酶活性、花青素含量和Fv/Fm均发生显著变化。水面和水下部分的参数存在差异，微塑料的响应遵循不同的趋势。显微镜观察证实，附着的微塑料颗粒上新形成的根，除了老根或芽组织。
Microplastics are one of the most widely discussed environmental issues worldwide. Several studies have shown the effect of microplastic exposure on the marine environment; however, studies on freshwater systems are lacking. This study was conducted to investigate the effect of microplastics on hydroponically growing emergent freshwater macrophytes, watermilfoil (sp.roraima) under controlled environmental conditions. Plants were exposed to 0 mg L−1(control), 0.05 mg L−1, 0.25 mg L−1, 1.25 mg L−1, and 6 mg L−1of 3-µm polystyrene microspheres for 7 days. The oxidative stress, antioxidant response, pigmentations, Fv/Fm, and growth parameters in the above-water and below-water parts were analyzed separately. Microscopic observations were performed to confirm the tissue absorbance of the microplastics. Exposure to microplastics altered some parameters; however, growth was not affected. The effect of microplastics was not linear with the exposure concentration for most of the parameters and between 1.25 and 6 mg L−1concentrations. The response trends mostly followed the second-order polynomial distributions. Under the 1.25 mg L−1exposure, there were significant changes in root length, H2O2content, catalase activity, anthocyanin content, and Fv/Fm. There were differences in parameters between the above-water and below-water parts, and the responses of the microplastics followed different trends. Microscopic observations confirmed the attachment of microplastic particles onto newly formed roots, except for older roots or shoot tissues.