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Interactions of zinc and cadmium toxicity in their effects on growth and in antioxidative systems in tomato plants (Solanum lycopersicum)
作者姓名:Jaouhra Cherif  Chamseddine Mediouni  Wided Ben Ammar  Fatma Jemal
作者单位:Unit of Research “Nitrogenized Nutrition and Metabolism and Stress Proteins” UR 99/09-20, Department of Biology, Faculty of Science, University of Tunis, Tunis 2092, Tunisia. E-mail: jaouhra.cherif@yahoo.fr,Unit of Research “Nitrogenized Nutrition and Metabolism and Stress Proteins” UR 99/09-20, Department of Biology, Faculty of Science, University of Tunis, Tunis 2092, Tunisia.,Unit of Research “Nitrogenized Nutrition and Metabolism and Stress Proteins” UR 99/09-20, Department of Biology, Faculty of Science, University of Tunis, Tunis 2092, Tunisia. and Unit of Research “Nitrogenized Nutrition and Metabolism and Stress Proteins” UR 99/09-20, Department of Biology, Faculty of Science, University of Tunis, Tunis 2092, Tunisia.
摘    要:

关 键 词:锌浓度  镉积累  相互作用  抗氧化系统  经济增长  毒性  植株  番茄
收稿时间:4/9/2010 12:00:00 AM
修稿时间:6/4/2010 12:00:00 AM

Interactions of zinc and cadmium toxicity in their e ects on growth and in antioxidative systems in tomato plants (Solanum lycopersicum)
Jaouhra Cherif,Chamseddine Mediouni,Wided Ben Ammar,Fatma Jemal.Interactions of zinc and cadmium toxicity in their e ects on growth and in antioxidative systems in tomato plants (Solanum lycopersicum)[J].Journal of Environmental Sciences,2011,23(5):837-844.
Authors:Jaouhra Cherif  Chamseddine Mediouni  Wided Ben Ammar and Fatma Jemal
Institution:20, Department of Biology, Faculty of Science, University of Tunis, Tunis 2092, Tunisia. E-mail: jaouhra.cherif@yahoo.fr
Abstract:The interaction between zinc and cadmium was investigated in tomato plants (Solanum lycopersicum). Ten-day-old seedlings were treated with 10 mol/L CdCl2 associated to di erent concentrations of ZnCl2 (10, 50, 100, and 150 mol/L). Zn supply clearly reduced Cd accumulation in leaves and simultaneously increased Zn concentration. Cd induced oxidative stress in leaves as indicated by an increase in thiobarbituric acid-reactive substances (TBARS) level and chlorophyll breakdown. Furthermore, compared with control, Cdtreated plants had significantly higher activities of superoxide dismutase (SOD, EC 1.15.1.1), whereas, catalase (CAT, EC 1.111.1.6), ascorbate peroxidase (APX, EC 1.11.1.11), and glutathione reductase (GR, EC 1.6.4.2) activities were significantly suppressed by Cd addition. Zn supplementation, at low level, restored and enhanced the functional activity of these enzymes (SOD, CAT, APX and GR) as compared to Cd-alone-treated plants. The beneficial e ect of adequate Zn level on Cd toxicity was confirmed by a significant decrease in TBARS level and restoration of chlorophyll content. However, when Zn was added at high level in combination with Cd there was an accumulation of oxidative stress, which was higher than that for Cd or excess Zn alone treatments. These results suggested that higher Zn concentrations and Cd are synergistic in their e ect on plant growth parameters and oxidative stress.
Keywords:Solanum lycopersicum  cadmium  zinc  oxidative stress  antagonism  synergism
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