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Interactions between pyrene and heavy metals and their fates in a soil-maize (Zea mays L.) system: Perspectives from the root physiological functions and rhizosphere microbial community
Environmental Pollution ( IF 7.6 ) Pub Date : 2021-06-18 , DOI: 10.1016/j.envpol.2021.117616 Yuhui Wang 1 , Manjie Li 2 , Zhaowei Liu 2 , Juanjuan Zhao 1 , Yongcan Chen 3
Environmental Pollution ( IF 7.6 ) Pub Date : 2021-06-18 , DOI: 10.1016/j.envpol.2021.117616 Yuhui Wang 1 , Manjie Li 2 , Zhaowei Liu 2 , Juanjuan Zhao 1 , Yongcan Chen 3
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The co-occurrence of polycyclic aromatic hydrocarbons (PAHs) and heavy metals in agricultural soils has become a worldwide food crop security concern. Pot experiments, rhizosphere microbial metagenomic sequencing, and root metatranscriptomic sequencing were performed to investigate the interactions among pyrene, Cu, and Cd in a soil-maize ( L.) system. This study provided direct evidence that the co-presence of PAHs and heavy metals changed the root physiological functions and the rhizosphere microbial community, which subsequently influenced the fate of the contaminants. Co-contamination at low levels tended to enhance the uptake potential and biodegradation performance of the plant, whereas increased contaminant concentrations produced opposite effects. The co-presence of 1000 mg/kg Cu decreased the abundance of in the rhizosphere and reduced pyrene degradation by 12%–16%. The presence of 400–750 mg/kg pyrene altered the metabolic processes, molecular binding functions, and catalytic activity of enzymes in the maize roots, thus impeding the phytoextraction of Cu and Cd. Competitive absorption between Cu and Cd was observed for the 800–1000 mg/kg Cu and 50–100 mg/kg Cd co-treatment, in which Cu showed a competitive advantage, enhancing its root-to-shoot translocation. These findings provide important information for the production of safe crops and for the development of phytoremediation technologies.
中文翻译：
芘和重金属之间的相互作用及其在土壤-玉米（Zea mays L.）系统中的命运：根生理功能和根际微生物群落的视角
多环芳烃（PAH）和重金属在农业土壤中的共存已成为全球粮食作物安全问题。通过盆栽实验、根际微生物宏基因组测序和根宏转录组测序来研究土壤-玉米 (L.) 系统中芘、铜和镉之间的相互作用。这项研究提供了直接证据，证明多环芳烃和重金属的共存改变了根部生理功能和根际微生物群落，从而影响了污染物的命运。低水平的共污染往往会增强植物的吸收潜力和生物降解性能，而污染物浓度的增加则会产生相反的效果。 1000 mg/kg Cu 的共存降低了根际的丰度，并减少了芘降解 12%–16%。 400-750 mg/kg 芘的存在改变了玉米根部酶的代谢过程、分子结合功能和催化活性，从而阻碍了铜和镉的植物提取。在 800-1000 mg/kg Cu 和 50-100 mg/kg Cd 共处理中观察到 Cu 和 Cd 之间的竞争性吸收，其中 Cu 显示出竞争优势，增强了其从根到地上部的易位。这些发现为安全作物的生产和植物修复技术的发展提供了重要信息。
更新日期：2021-06-18
中文翻译：
芘和重金属之间的相互作用及其在土壤-玉米（Zea mays L.）系统中的命运：根生理功能和根际微生物群落的视角
多环芳烃（PAH）和重金属在农业土壤中的共存已成为全球粮食作物安全问题。通过盆栽实验、根际微生物宏基因组测序和根宏转录组测序来研究土壤-玉米 (L.) 系统中芘、铜和镉之间的相互作用。这项研究提供了直接证据，证明多环芳烃和重金属的共存改变了根部生理功能和根际微生物群落，从而影响了污染物的命运。低水平的共污染往往会增强植物的吸收潜力和生物降解性能，而污染物浓度的增加则会产生相反的效果。 1000 mg/kg Cu 的共存降低了根际的丰度，并减少了芘降解 12%–16%。 400-750 mg/kg 芘的存在改变了玉米根部酶的代谢过程、分子结合功能和催化活性，从而阻碍了铜和镉的植物提取。在 800-1000 mg/kg Cu 和 50-100 mg/kg Cd 共处理中观察到 Cu 和 Cd 之间的竞争性吸收，其中 Cu 显示出竞争优势，增强了其从根到地上部的易位。这些发现为安全作物的生产和植物修复技术的发展提供了重要信息。
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