Effects of copper oxide nanoparticles on growth of lettuce (Lactuca sativa L.) seedlings and possible implications of nitric oxide in their antioxidative defense
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Environmental Monitoring and Assessment
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Copper oxide nanoparticles (CuO NPs) have
been extensively explored for use in agriculture. Previous
studies have indicated that application of CuO NPs
might be promising for development and conservation
of plants, pest control, and for the recovery of degraded
soils. However, depending on the applied concentration
copper can cause phytotoxic effects. In this work,
biosynthesized CuO NPs (using green tea extract) were
evaluated on their effects on lettuce (Lactuca sativa L.)
seedling growth, which were exposed at concentrations
ranged between 0.2 and 300 μg mL−1. From the
biosynthesized were obtained ultra-small CuO NPs
(~ 6.6 nm), with high stability in aqueous suspension. Toxicity bioassays have shown that at low concentrations
(up to 40 μg mL−1), CuO NPs did not affect or
even enhanced the seed germination. At higher concentrations
(higher than 40 μg mL−1), inhibition of seed
germination and radicle growth ranging from 35 to 75%
was observed. With the increase of CuO NPs concentrations,
nitrite and S-nitrosothiols levels in radicles
increased, whereas superoxide dismutase and total antioxidant
activities decreased. The nitrite and Snitrosothiols
levels in lettuce radicles showed a direct
dose response to CuO NP application, which may indicate
nitric oxide-dependent signaling pathways in the
plant responses. Therefore, the results demonstrated that
at low concentrations (≤ 20 μg mL−1) of CuO NPs,
beneficial effects are obtained from seedlings, enhancing
plant growth, and the involvement of nitric oxide
signaling in the phytotoxic effects induced by high
concentration of this formulation.
Como referenciar
PELEGRINO, MILENA T.; KOHATSU, MARCIO Y.; SEABRA, AMEDEA B.; MONTEIRO, LUCILENA R.; GOMES, DIEGO G.; OLIVEIRA, HALLEY C.; ROLIM, WALLACE R.; JESUS, TATIANE A. de; BATISTA, BRUNO L.; LANGE, CAMILA N. Effects of copper oxide nanoparticles on growth of lettuce (Lactuca sativa L.) seedlings and possible implications of nitric oxide in their antioxidative defense. Environmental Monitoring and Assessment, v. 192, n. 4, p. 1-14, 2020. DOI: 10.1007/s10661-020-8188-3. Disponível em: http://repositorio.ipen.br/handle/123456789/31360. Acesso em: 30 Dec 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.