Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/51271
Título: | SiO₂ nanomaterial as a tool to improve Hordeum vulgare L. tolerance to nano-NiO stress |
Autor(es): | Soares, Cristiano Branco-Neves, Simão de Sousa, Alexandra Azenha, Manuel Cunha, Ana Pereira, Ruth Fidalgo, Fernanda |
Palavras-chave: | Antioxidant system Barley plants Nickel oxide nanomaterial Oxidative stress Photosynthesis Silicon dioxide nanomaterial |
Data: | 1-Mai-2018 |
Editora: | Elsevier B.V. |
Revista: | Science of the Total Environment |
Resumo(s): | This work was designed to assess the potential role of silicon dioxide nanomaterial (nano-SiO 2) in enhancing barley's tolerance to nickel oxide nanomaterial (nano-NiO). For this purpose, plants were grown for 14 days under nano-NiO (120 mg kg − 1 ) single and co-exposure with nano-SiO 2 (3 mg kg − 1 ). The exposure of barley to nano-NiO caused a significant decrease in growth-related parameters and induced a negative response on the photosynthetic apparatus. However, upon nano-SiO 2 co-exposure, the inhibitory effects of nano-NiO were partially reduced, with lower reductions in fresh and dry biomass, and with the recovery of the photosynthesis-related parameters. Plants growing under nano-NiO stress showed an overproduction of superoxide anion (O 2 − ), which favored the occurrence of oxidative stress and the enhancement of lipid peroxidation (LP), but the co-treatment with nano-SiO 2 reverted this tendency, generally lowering or maintaining the levels of LP and stimulating the redox pathway of thiols. The evaluation of the antioxidant (AOX) system revealed that nano-NiO induced the accumulation of proline, along with a decrease in ascorbate in leaves. Furthermore, superoxide dismutase (SOD) activity was significantly enhanced and catalase (CAT) and ascorbate peroxidase (APX) seemed to have a pivotal role in H 2 O 2 detoxification in leaves and roots, respectively. The response of the AOX system was even more prominent upon nano-SiO 2 co-exposure, reinforcing the ameliorating functions of this nanomaterial. Overall, the present study highlighted the protective role of nano-SiO 2 in barley plants under nano-NiO stress, possibly due to the Si-mediated protection against oxidative stress, by a more proactive performance of the plant AOX system. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/51271 |
DOI: | 10.1016/j.scitotenv.2017.12.002 |
ISSN: | 0048-9697 |
Arbitragem científica: | yes |
Acesso: | Acesso restrito UMinho |
Aparece nas coleções: | CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series DBio - Artigos/Papers |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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1-s2.0-S0048969717334216-main.pdf Acesso restrito! | 1,21 MB | Adobe PDF | Ver/Abrir |