| 微塑料对黑麦草吸收和累积水体中环丙沙星的影响 |
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| 引用本文： | 单宁,祖木热提·艾比布,米丽班·霍加艾合买提,努扎艾提·艾比布.微塑料对黑麦草吸收和累积水体中环丙沙星的影响[J].环境科学研究,2020,33(12):2906-2912. |
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| 作者姓名： | 单宁 祖木热提·艾比布 米丽班·霍加艾合买提 努扎艾提·艾比布 |
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| 作者单位： | 1.新疆师范大学化学化工学院, 新疆 乌鲁木齐 830054 |
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| 基金项目： | 新疆维吾尔自治区自然科学基金青年项目（No.2017D01B31） |
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| 摘 要： | 微塑料（microplastics，MPs）和抗生素作为新型环境污染物，引起了国内外学者对其生态风险的关注.以黑麦草（Lolium perenne L.）为供试植物，以聚苯乙烯微塑料和环丙沙星（ciprofloxacin，CIP）为研究对象，探讨微塑料对水培黑麦草吸收和富集抗生素的影响及MPs-CIP复合污染对植物生长的毒性作用.结果表明:黑麦草对单一CIP和MPs-CIP复合污染中的CIP均有吸收去除能力，底物中微塑料的存在会促进黑麦草对低浓度CIP的吸收去除，去除率最高可达100%，但对高浓度（1.0、2.0 mg/L）CIP吸收的影响不显著（P>0.05）.同时，微塑料可促进黑麦草根部积累的CIP向地上部转运，当CIP浓度分别为0.1、2.0 mg/L时，投加微塑料后根部积累的CIP含量与单一CIP处理组相比分别降低了44.0%、21.2%，叶片中CIP的积累量分别增加了2.9、3.0倍.微塑料的加入显著加重了CIP对黑麦草生长和叶绿素含量的抑制作用.与2.0 mg/L CIP处理组相比，50.0 mg/L MPs-2.0 mg/L CIP复合污染处理组对黑麦草根长和鲜质量的抑制率分别增加了53.7%和79.6%，而叶绿素a、b含量则分别降低了38.5%和44.4%.研究显示，水体中微塑料与CIP的共存会影响黑麦草吸收和体内积累CIP，并加重CIP对植物生长的毒性作用.
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| 关 键 词： | 微塑料 环丙沙星 黑麦草 复合污染物 |
| 收稿时间： | 2020/6/12 0:00:00 |
| 修稿时间： | 2020/10/8 0:00:00 |
Effects of Microplastics on Ryegrass (Lolium perenne L.) Uptake and Accumulation of Ciprofloxacin |
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| SHAN Ning,HABIBUL Zumrat,HOJAHMAT Mihriban,HABIBUL Nuzahat.Effects of Microplastics on Ryegrass (Lolium perenne L.) Uptake and Accumulation of Ciprofloxacin[J].Research of Environmental Sciences,2020,33(12):2906-2912. |
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| Authors: | SHAN Ning HABIBUL Zumrat HOJAHMAT Mihriban HABIBUL Nuzahat |
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| Affiliation: | 1.Institute of Chemistry and Chemical Technology, Xinjiang Normal University, Urumqi 830054, China2.Changji Vocational and Technical College, Changji 831100, China |
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| Abstract: | Microplastics (MPs) and antibiotics are emerging pollutants that have received broad concern for their ecological threats. Previous research has shown that MPs may act as carriers for harmful chemicals transport in the aquatic environment. However, the potential effects of MPs on the assimilation of antibiotics by higher plants are not well understood. In this study, the effects of polystyrene MPs on ryegrass uptake of ciprofloxacin (CIP) were assessed. At the same time, the toxicity of MPs-CIP mixture on the specific root and leaf growth and the chlorophyll content in the leaves were also determined. The results of hydroponic experiments indicate that ryegrass could uptake CIP from hydroponic solution with and without MPs. MPs could enhance root uptake of CIP at 0.1 mg/L (100%), while there was no significant difference in the uptake of 1 mg/L and 2 mg/L CIP with or without MPs (P>0.05). MPs also increased the translocation of CIP from roots to leaves. Compared to CIP treatment alone, the CIP contents in roots treated with 50.0 mg/L MPs-0.1 mg/L CIP and 50.0 mg/L MPs-2.0 mg/L CIP decreased by 44.0% and 21.2%, respectively. However, CIP contents in leaves increased by 2.9 times and 3.0 times, respectively (P<0.05). Furthermore, MPs significantly increased the toxic effects of CIP to ryegrass root/leaf elongation and chlorophyll contents. Compared to only 2.0 mg/L CIP treatment, 50.0 mg/L MPs-2.0 mg/L CIP treatment resulted in inhibition of root length and weight by 53.7% and 79.6%, respectively, while the contents of chlorophyll a and chlorophyll decreased by 38.5% and 44.4%, respectively. Our results indicate that the presence of microplastics in freshwater ecosystems might enhance plant uptake and accumulation of antibiotics. |
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| Keywords: | microplastics ciprofloxacin ryegrass combined pollutant |
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