微塑料
生物累积
水生植物
化学
过氧化氢酶
环境化学
动物科学
生物
氧化应激
生态学
生物化学
作者
Mudalige Don Hiranya Jayasanka Senavirathna,Zhaozhi Liu,Takeshi Fujino
出处
期刊:Research Square - Research Square
日期:2021-07-26
标识
DOI:10.21203/rs.3.rs-644505/v1
摘要
Abstract 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 − 1 of 3 µm polystyrene microspheres for seven days. The oxidative stress, antioxidant response, pigmentations, Fv/Fm, and growth parameters in 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 mg L − 1 and 6 mg L − 1 concentrations. The response trends mostly followed the second-order polynomial distributions. Under the 1.25 mg L − 1 exposure, there were significant changes in root length, H 2 O 2 content, 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.
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