Utilize este identificador para referenciar este registo:
https://hdl.handle.net/10316/3909
Título: | Comparative effects of the herbicides dicamba, 2,4-D and paraquat on non-green potato tuber calli | Autor: | Peixoto, Francisco P. Gomes-Laranjo, José Vicente, Joaquim A. Madeira, Vítor M. C. |
Palavras-chave: | Dicamba; Herbicide; Oxidative stress; Paraquat | Data: | 2008 | Citação: | Journal of Plant Physiology. 165:11 (2008) 1125-1133 | Resumo: | The effects of the herbicides 1,1'-dimethyl-4,4'-bipyridylium dichloride (paraquat), 3,6-dichloro-2-metoxybenzoic acid (dicamba) and 2,4-dichlorophenoxyacetic acid (2,4-D) on cell growth of non-green potato tuber calli are described. We attempted to relate the effects with toxicity, in particular the enzymes committed to the cellular antioxidant system. Cell cultures were exposed to the herbicides for a period of 4 weeks. Cellular integrity on the basis of fluorescein release was strongly affected by 2,4-D, followed by dicamba, and was not affected by paraquat. However, the three herbicides decreased the energy charge, with paraquat and 2,4-D being very efficient. Paraquat induced catalase (CAT) activity at low concentrations (1 [mu]M), whereas at higher concentrations, inhibition was observed. Dicamba and 2,4-D stimulated CAT as a function of concentration. Superoxide dismutase (SOD) activity was strongly stimulated by paraquat, whereas dicamba and 2,4-D were efficient only at higher concentrations. Glutathione reductase (GR) activity was induced by all the herbicides, suggesting that glutathione and glutathione-dependent enzymes are putatively involved in the detoxification of these herbicides. Paraquat slightly inhibited glutathione S-transferase (GST), whereas 2,4-D and dicamba promoted significant activation. These results indicate that the detoxifying mechanisms for 2,4-D and dicamba may be different from the mechanisms of paraquat detoxification. However, the main cause of cell death induced by paraquat and 2,4-D is putatively related with the cell energy charge decrease. | URI: | https://hdl.handle.net/10316/3909 | DOI: | 10.1016/j.jplph.2007.12.013 | Direitos: | openAccess |
Aparece nas coleções: | FCTUC Ciências da Vida - Artigos em Revistas Internacionais |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
---|---|---|---|---|
file333da63406284eda9d81659cb4745639.pdf | 307.4 kB | Adobe PDF | Ver/Abrir |
Citações SCOPUSTM
30
Visto em 11/nov/2022
Citações WEB OF SCIENCETM
31
Visto em 2/ago/2024
Visualizações de página
377
Visto em 20/ago/2024
Downloads 50
596
Visto em 20/ago/2024
Google ScholarTM
Verificar
Altmetric
Altmetric
Todos os registos no repositório estão protegidos por leis de copyright, com todos os direitos reservados.