Root Adsorption of Microplastic Particles Affects the Submerged Freshwater Macrophyte Egeria densa
Root Adsorption of Microplastic Particles Affects the Submerged Freshwater Macrophyte Egeria densa
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DOI：
10.1007/s11270-022-05556-2
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发表时间：
2022-02
期刊：
影响因子：
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通讯作者：
M. D. H. J. Senavirathna;Liu Zhaozhi;Takeshi Fujino
中科院分区：
文献类型：
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作者：
M. D. H. J. Senavirathna;Liu Zhaozhi;Takeshi Fujino
微塑料在全球范围内造成了广泛的水环境污染。因此，淡水系统中的微塑料近年来受到越来越多的关注。然而，微塑料对淡水大型植物的影响仍然知之甚少。本研究探讨了微塑料对淡水沉水巨藻的影响。通过控制光照、温度和营养条件下的室内实验，探讨了暴露于低浓度微塑料对e的伸长、色素沉淀、氧化应激、抗氧化反应和叶绿素荧光参数的影响。densa.E。分别于0.05、0.25、1.25和6 mg L - 1的3µm聚苯乙烯微球中暴露7天。即使暴露于最低浓度的微塑料后，也观察到色素沉着、氧化应激、抗氧化剂和叶绿素荧光参数的变化。这些反应都与微塑料浓度的增加无关。伸长和光合色素变化不显著。显微观察证实，微塑料颗粒没有被吸收到组织中，而是被吸附到根部。微塑料浓度为0.25 mg L−1为阈值浓度forE。densa。我们的研究结果强调了微塑料对淡水大型植物的重大影响。需要进一步的研究来调查对微塑料暴露的长期反应。
Microplastics cause extensive contamination of water environments worldwide. As such, microplastics in freshwater systems have received increased attention in recent years. However, the effects of microplastics on freshwater macrophytes remain poorly understood. This study investigates the effects of microplastics on the submerged freshwater macrophyteEgeria densa. A laboratory experiment with controlled light, temperature, and nutrient conditions was conducted to explore the effects of exposure to low-concentration microplastics on the elongation, pigmentation, oxidative stress, antioxidant responses, and chlorophyll fluorescence parameters ofE. densa.E. densa, planted soilless in aquaria, were exposed to 0.05, 0.25, 1.25, and 6 mg L−1of 3-µm polystyrene microspheres for 7 days. Changes in pigmentation, oxidative stress, antioxidants, and chlorophyll fluorescence parameters were observed even after exposure to the lowest concentration of microplastics. None of these responses correlated with increasing microplastic concentration. Elongation and photosynthetic pigments did not change significantly. Microscopic observations confirmed that the microplastic particles were not absorbed into tissues but were adsorbed to the roots. The microplastic concentration of 0.25 mg L−1was the threshold concentration value forE. densa. Our findings highlight the significant effects of microplastic on freshwater macrophytes. Further research is required to investigate the long-term responses to microplastic exposure.