Zhao Chen, Zhipeng Guo, Nan Xu, Md. Zulfikar Khan and Junpeng Niu
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引用次数: 0
Abstract
Nanotechnology has a wide range of applications, and the pollution and toxicity of their overuse must also be taken seriously. The dual effects of cerium oxide nanoparticles (CeO2 NPs) on alfalfa (Medicago sativa L.) through regulating programmed cell death (PCD) were investigated. Herein, foliar spray of CeO2 NPs on alfalfa revealed a dose-dependent effect of CeO2 NPs. CeO2 NPs at low concentrations had a positive effect but those at high concentrations had phytotoxicity. Specifically, 100 mg L−1 CeO2 NPs improved the morphology, biomass, pigments, photosynthesis, stomatal opening, ultrastructure, osmotic and redox homeostasis, the antioxidant enzyme and the anti-PCD genes, and several hormones, accompanied by lower PCD-promoting gene expression and cellular features. Conversely, 1000 mg L−1 CeO2 NPs induced PCD by causing oxidative damage, along with negative morphology, reduced quality, high Ce accumulation, weak photosynthesis, stomatal closure, lipid peroxidation, apoptosis, impaired cellular ultrastructure, DNA fragmentation, osmotic and redox instability, gene alterations, and hormonal fluctuations. Overall, alfalfa responds to the duality of CeO2 NPs by controlling PCD, which is regulated by a complex network. This study proposes a fresh outlook on the rational utilization of CeO2 NPs, the promotion of sustainable agriculture, and the prevention of environmental pollution caused by nanomaterials.
期刊介绍:
Environmental Science: Nano serves as a comprehensive and high-impact peer-reviewed source of information on the design and demonstration of engineered nanomaterials for environment-based applications. It also covers the interactions between engineered, natural, and incidental nanomaterials with biological and environmental systems. This scope includes, but is not limited to, the following topic areas:
Novel nanomaterial-based applications for water, air, soil, food, and energy sustainability
Nanomaterial interactions with biological systems and nanotoxicology
Environmental fate, reactivity, and transformations of nanoscale materials
Nanoscale processes in the environment
Sustainable nanotechnology including rational nanomaterial design, life cycle assessment, risk/benefit analysis