| Kinetics of the Anti-oxidant Response to Salinity in the Halophyte Cakile maritima |
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| 作者姓名： | Ana Jiménez |
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| 作者单位： | [1]Centre de Biotechnologie a la Technopole de Borj Cedna, Laboratoire d＇Adaptation des Plantes sux Stress Abiotiques, BP 901, Hammam-Lif 2050, Tunisia [2]Department of Plant Stress Biology and Pathology, Centro de Edafologia y Biologia Aplicada del Segura, Consejo Superior de Investigaciones Cientificas （CSIC）, Apdo. 164, E-30100 Murcia, Spain |
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| 摘 要： | The effects of NaCl stress on the activity of anti-oxidant enzymes （superoxide dismutase, catalase （CAT）, peroxidase （POD）, ascorbate peroxidase （APX）, monodehydroascorbate reductase, dehydroascorbate reductase （DHAR）, and glutathione reductase （GR））, anti-oxidant molecules （ascorbate and glutathione）, and parameters of oxidative stress （malondialdehyde （MDA）, electrolyte leakage, and H2O2 concentrations） were investigated in Cakile maritima, a halophyte frequent along the Tunisian seashore. Seedlings were grown in the presence of salt （100, 200, and 400 mmol/L NaCl）. Plants were harvested periodically over 20 days. Growth was maximal in the presence of 0-100 mmol/L NaCl. At 400 mmol/L NaCl, growth decreased significantly. The salt tolerance of C. maritima, at moderate salinities, was associated with the lowest values of the parameters indicative of oxidative stress, namely the highest activities of POD, CAT, APX, DHAR, and GR and high tissue content of ascorbate and glutathione. However, prolonged exposure to high salinity resulted in a decrease in anti-oxidant activities and high MDA content, electrolyte leakage, and H2O2 concentrations. These results suggest that anti-oxidant systems participate in the tolerance of C. maritima to moderate salinities.
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| 关 键 词： | 抗氧化剂活性 抗坏血酸盐 谷胱甘肽 盐生植物 碱耐性 |
| 修稿时间： | 2006-07-072006-09-26 |
Kinetics of the Anti-oxidant Response to Salinity in the Halophyte Cakile maritima |
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| Authors: | Nader Ben Amor Ana Jiménez Wided Megdiche Marianne Lundqvist Francisca Sevilla Chedly Abdelly |
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| Institution: | ( Centre de Biotechnologie àla Technopole de Borj Cédria, Laboratoire d'Adaptation des Plantes aux Stress Abiotiques, BP 901, Hammam-Lif 2050, Tunisia;;Department of Plant Stress Biology and Pathology, Centro de Edafología y Biología Aplicada del Segura, Consejo Superior de Investigaciones Cientificas (CSIC), Apdo. 164, E-30100 Murcia, Spain;) |
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| Abstract: | The effects of NaCl stress on the activity of anti-oxidant enzymes (superoxide dismutase, catalase (CAT), peroxidase (POD),ascorbate peroxidase (APX), monodehydroascorbate reductase, dehydroascorbate reductase (DHAR), and glutathione reductase (GR)), anti-oxidant molecules (ascorbate and glutathione), and parameters of oxidative stress (malondialdehyde (MDA), electrolyte leakage, and H2O2 concentrations) were investigated in Cakile maritima, a halophyte frequent along the Tunisian seashore. Seedlings were grown in the presence of salt (100, 200, and 400 mmol/L NaCl). Plants were harvested periodically over 20 days. Growth was maximal in the presence of 0-100 mmol/L NaCl. At 400 mmol/L NaCl, growth decreased significantly. The salt tolerance of C. maritima, at moderate salinities, was associated with the lowest values of the parameters indicative of oxidative stress, namely the highest activities of POD, CAT, APX, DHAR, and GR and high tissue content of ascorbate and glutathione. However, prolonged exposure to high salinity resulted in a decrease in anti-oxidant activities and high MDA content, electrolyte leakage, and H2O2 concentrations. These results suggest that anti-oxidant systems participate in the tolerance of C. maritima to moderate salinities. |
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| Keywords: | anti-oxidant activities ascorbate glutathione halophyte lipid peroxidation salt tolerance |
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