John Wiley & Sons, Ltd.

Natural organic matter‐induced alleviation of the phytotoxicity to rice (Oryza sativa L.) caused by CuO nanoparticles

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Natural organic matter (NOM) can interact with engineered nanoparticles (NPs) in the environment and modify their behavior and toxicity to organisms. In the present study, the phytotoxicity of copper oxide (CuO) NPs to rice seedlings in the presence of humic acid (HA) as a model NOM was investigated. The results showed that CuO NPs induced the inhibition of root elongation, aberrations in root morphology and ultrastructures, and losses of cell viability and membrane integrity. The adverse effects were partly resulted from the generation of reactive oxygen species (ROS) caused by CuO NPs, which led to lipid peroxidation, mitochondrial dysfunction, and programmed cell death (PCD) in rice seedlings. However, all the phytotoxicity was alleviated with the addition of HA because that HA coatings on nanoparticle (NP) surfaces enhanced electrostatic and steric repulsion between the CuO NPs and the plant cell wall/membrane so that the contact between NPs and plant and CuO NP‐induced oxidative damage to plant cells were reduced. Our results shed light on the mechanism underlying NP phytotoxicity and highlight the influence of NOM on the bioavailability and toxicity of NPs. This article is protected by copyright. All rights reserved

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