Institute of Environmental Processes and Pollution Control, School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China.
Institute of Agricultural Resources and Environment, Sichuan Academy of Agricultural Sciences, Chengdu 610066, China.
Environ Sci Technol. 2022 Dec 6;56(23):17385-17395. doi: 10.1021/acs.est.2c05828. Epub 2022 Nov 9.
To promote the sustainable and safe application of nanotechnology employing engineered nanoparticles (NPs) in agroecosystems, it is crucial to pay more attention to the NP-mediated biological response process and environmental impact assessment simultaneously. Herein, 50 mg kg LaO NPs were added to soils without and with earthworms for cherry radish growth for 50 days to investigate the response changes of metabolites in radish above- and below-ground organs and rhizosphere bacterial communities. We found that LaO NP exposure, especially with earthworms, notably increased the La bioavailability and uptake by taproots and eventually increased radish leaf sucrose content and plant biomass. The LaO NP exposure significantly altered metabolite profiles in taproot flesh and peel tissues, and particularly LaO NP exposure combined with earthworms was more conducive to LaO NPs to promote radish taproot peel to synthesize more secondary antioxidant metabolites. Moreover, compared with the control, the LaO NP exposure resulted in weaker and fewer correlations between rhizosphere bacteria and taproot metabolites, but this was recovered somewhat after the inoculation of earthworms. Altogether, our results provide novel insights into the soil-fauna-driven biological and biochemical impact of LaO NP exposure on edible root crops and the long-term environmental risks to the rhizosphere microbiota in agroecosystems.
为了促进在农业生态系统中采用工程纳米粒子（NPs）的可持续和安全应用纳米技术，同时关注 NP 介导的生物反应过程和环境影响评估至关重要。在此，将 50 mg kg LaO NPs 添加到没有和有蚯蚓的土壤中，用于樱桃萝卜生长 50 天，以研究萝卜地上和地下器官以及根际细菌群落中代谢物的响应变化。我们发现，LaO NP 暴露，特别是与蚯蚓结合，明显增加了 La 的生物可利用性和根系吸收，并最终增加了萝卜叶片蔗糖含量和植物生物量。LaO NP 暴露显著改变了肉质根皮组织的代谢物谱，特别是 LaO NP 暴露与蚯蚓结合更有利于 LaO NPs 促进萝卜肉质根皮合成更多的次生抗氧化代谢物。此外，与对照组相比，LaO NP 暴露导致根际细菌与萝卜肉质根代谢物之间的相关性减弱和变少，但在接种蚯蚓后有所恢复。总的来说，我们的结果为 LaO NP 暴露对可食用根作物的土壤-动物群驱动的生物和生化影响以及农业生态系统中根际微生物区系的长期环境风险提供了新的见解。
