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微塑料和抗生素的复合污染改变了小麦和玉米根际土壤微生物群落组成和代谢。

Combined contamination of microplastic and antibiotic alters the composition of microbial community and metabolism in wheat and maize rhizosphere soil.

机构信息

State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau / College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China.

State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau / College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; College of Soil and Water Conservation Science and Engineering (Institute of Soil and Water Conservation), Northwest A&F University, Yangling, Shaanxi 712100, China; Institute of Soil and Water Conservation, Yangling, Chinese Academy of Sciences and Ministry of Water Resources, Shaanxi 712100, China; School of Biological Sciences, The University of Western Australia, Perth, WA 6009, Australia.

出版信息

J Hazard Mater. 2024 Jul 15;473:134618. doi: 10.1016/j.jhazmat.2024.134618. Epub 2024 May 15.

Abstract

The widespread application of antibiotics and plastic films in agriculture has led to new characteristics of soil pollution. The impacts of combined contamination of microplastics and antibiotics on plant growth and rhizosphere soil bacterial community and metabolisms are still unclear. We conducted a pot experiment to investigate the effects of polyethylene (0.2%) and norfloxacin/doxycycline (5 mg kg), as well as the combination of polyethylene and antibiotics, on the growth, rhizosphere soil bacterial community and metabolisms of wheat and maize seedlings. The results showed that combined contamination caused more serious damage to plant growth than individual contamination, and aggravated root oxidative stress responses. The diversity and structure of soil bacterial community were not markedly altered, but the composition of the bacterial community, soil metabolisms and metabolic pathways were altered. The co-occurrence network analysis indicated that combined contamination may inhibit the growth of wheat and maize seedings by simplifying the interrelationships between soil bacteria and metabolites, and altering the relative abundance of specific bacteria genera (e.g. Kosakonia and Sphingomonas) and soil metabolites (including sugars, organic acids and amino acids). The results help to elucidate the potential mechanisms of phytotoxicity of the combination of microplastic and antibiotics.

摘要

抗生素和塑料薄膜在农业中的广泛应用导致了土壤污染的新特征。微塑料和抗生素联合污染对植物生长和根际土壤细菌群落和代谢的影响尚不清楚。我们进行了盆栽实验,研究了聚乙烯(0.2%)和诺氟沙星/强力霉素(5mg/kg)以及聚乙烯和抗生素的组合对小麦和玉米幼苗生长、根际土壤细菌群落和代谢的影响。结果表明,联合污染比单一污染对植物生长造成更严重的损害,并加重了根的氧化应激反应。土壤细菌群落的多样性和结构没有明显改变,但群落组成、土壤代谢物和代谢途径发生了改变。共现网络分析表明,联合污染可能通过简化土壤细菌和代谢物之间的相互关系,并改变特定细菌属(如 Kosakonia 和 Sphingomonas)和土壤代谢物(包括糖、有机酸和氨基酸)的相对丰度,从而抑制小麦和玉米种子的生长。这些结果有助于阐明微塑料和抗生素组合的植物毒性的潜在机制。

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