Shi Ruiying, Liu Weitao, Lian Yuhang, Zeb Aurang, Wang Qi
MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; Tianjin Engineering Research Center of Environmental Diagnosis and Contamination Remediation, Tianjin 300350, China.
MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; Tianjin Engineering Research Center of Environmental Diagnosis and Contamination Remediation, Tianjin 300350, China.
Sci Total Environ. 2023 Feb 10;859(Pt 1):160025. doi: 10.1016/j.scitotenv.2022.160025. Epub 2022 Nov 8.
Much attention has been paid to the prevalence of microplastics (MPs) in terrestrial systems. MPs have been shown to affect the physio-biochemical properties of plants. Different MPs may have distinctive behaviors and diverse effects on plant growth. In the present study, the effects of polystyrene (PS), polyethylene (PE), and polypropylene (PP) MPs on physio-biochemical properties, root exudates, and metabolomics of tomato (Lycopersicon esculentum L.) under hydroponic conditions were investigated. Our results show that MPs exposure has adverse effects on tomato growth. MPs exposure had a significant type-dependent effect (p < 0.001) on photosynthetic gas parameters, chlorophyll content, and antioxidant enzyme activities. After exposure to MPs, the content of low molecular weight organic acids in tomato root exudates was significantly increased, which was considered as a strategy to alleviate the toxicity of MPs. In addition, MPs treatment significantly changed the metabolites of tomato root and leaf. Metabolic pathway analysis showed that MPs treatment had a great effect on amino acid metabolism. We also found that plants exposed to PS and PP MPs produced more significant metabolic reprogramming than those exposed to PE MPs. This study provides important implications for the mechanism studies on the toxic effect of various MPs on crops and their future risk assessment.
微塑料（MPs）在陆地系统中的普遍性已受到广泛关注。研究表明，微塑料会影响植物的生理生化特性。不同的微塑料对植物生长可能具有不同的行为和多样的影响。在本研究中，研究了聚苯乙烯（PS）、聚乙烯（PE）和聚丙烯（PP）微塑料在水培条件下对番茄（Lycopersicon esculentum L.）生理生化特性、根系分泌物和代谢组学的影响。我们的结果表明，暴露于微塑料对番茄生长具有不利影响。微塑料暴露对光合气体参数、叶绿素含量和抗氧化酶活性具有显著的类型依赖性影响（p < 0.001）。暴露于微塑料后，番茄根系分泌物中低分子量有机酸的含量显著增加，这被认为是一种减轻微塑料毒性的策略。此外，微塑料处理显著改变了番茄根和叶的代谢物。代谢途径分析表明，微塑料处理对氨基酸代谢有很大影响。我们还发现，暴露于PS和PP微塑料的植物比暴露于PE微塑料的植物产生更显著的代谢重编程。本研究为各种微塑料对作物毒性效应的机制研究及其未来风险评估提供了重要启示。
