Antioxidant response of Nicotiana tabacum cv. Bright Yellow 2 cells to cadmium and nickel stress

Plant Cell, Tissue and Organ Culture - Tập 94 - Trang 73-83 - 2008
Priscila L. Gratão1, Georgia B. Pompeu2, Flávia R. Capaldi1, Victor A. Vitorello3, Peter J. Lea4, Ricardo A. Azevedo1
1Departamento de Genética, Escola Superior de Agricultura Luiz de Queiroz, Universidade de São Paulo (USP), Piracicaba, Brazil
2Laboratório de Ecotoxicologia, Centro de Energia Nuclear na Agricultura (CENA), Piracicaba, Brazil
3Laboratório de Biologia Celular e Molecular, Centro de Energia Nuclear na Agricultura (CENA), Piracicaba, Brazil
4Department of Biological Sciences, University of Lancaster, Lancaster, UK

Tóm tắt

Plant cell cultures are a suitable model system for investigation of the physiological mechanisms of tolerance to environmental stress. We have determined the effects of Cd (0.1 and 0.2 mM CdCl2) and Ni (0.075 and 0.75 mM NiCl2) on Nicotiana tabacum L. cv. Bright Yellow (TBY-2) cell suspension cultures over a 72-h period. Inhibition of growth, loss of cell viability and lipid peroxidation occurred, in general, only when the TBY-2 cells were grown at 0.2 mM CdCl2 and at 0.75 mM NiCl2. At 0.1 mM CdCl2, a significant increase in growth was determined at the end of the experiment. Increases in the activities of all of the four enzymatic antioxidant defence systems tested, were induced by the two concentrations of Cd and Ni, but at different times during the period of metal exposure. Overall, the cellular antioxidant responses to Cd and Ni were similar and were apparently sufficient to avoid oxidative stress at the lower concentrations of Cd and Ni. The activities of glutathione reductase and glutathione S-transferase increased early but transiently, whereas the activities of catalase and guaiacol peroxidase increased in the latter half of the experimental period. Therefore it is likely that the metabolism of reduced glutathione was enhanced during the initial onset of the stress, while catalase and guaiacol-type peroxidase appeared to play a more important role in the antioxidant response once the stress became severe.

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