| .菊苣幼苗对铯、镉的生理响应[J].农业环境科学学报,2013,32(5):. |
| 菊苣幼苗对铯、镉的生理响应 |
| The Physiological Response of Cichorium intybus L. Seedlings to Treatments with Cesium and Cadmium |
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| DOI：10.11654/jaes.2013.05.004 |
| 中文关键词: 铯 镉 脯氨酸含量 活性氧代谢 菊苣 |
| 英文关键词: cesium cadmium the contents of proline active oxygen metabolism chicory |
| 基金项目: |
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| 摘要点击次数: 2003 |
| 全文下载次数: 1752 |
| 中文摘要: |
| 采用单因素铯（Cs）处理 [ρ（CsCl）20~140 mg·L-1]及镉（Cd）/铯复合处理[ρ（CdCl2+CsCl）20 mg·L-1+20~140 mg·L-1]，测定菊苣（Cichorium intybus L.）种子发芽特性、幼苗蛋白质和脯氨酸（Pro）含量及活性氧代谢变化，研究镉/铯共存体系中铯的生物学效应。结果显示：（1）单因素Cs+处理对菊苣发芽势（GP）、发芽率（GR）和发芽指数（GI）的影响不显著，随着Cs+ 浓度增加，幼苗可溶性蛋白质含量呈递减趋势，脯氨酸（Pro）含量、超氧化物歧化酶（SOD）和过氧化氢酶（CAT）活性、超氧阴离子自由基（O-2·）产生速率及过氧化氢（H2O2）和丙二醛（MDA）含量则总体上递增，过氧化物酶（POD）活性有所增加；（2）Cd2+/Cs+复合处理下，随着其中的Cs+浓度提高，SOD活性和O-2·产生速率先升后降，Pro含量、CAT活性等与单因素Cs+处理的变化趋势一致；（3）与单因素Cs+处理比较，复合处理的蛋白质含量、SOD活性均有所降低，其他代谢指标的值总体上高于单因素处理。研究表明，低浓度Cs+[ρ（CsCl）20 mg·L-1]单因素处理对菊苣幼苗生长和活性氧代谢无显著影响，高浓度Cs+[ρ（CsCl）60~140 mg·L-1]单因素处理及Cd2+/Cs+复合处理则表现严重的过氧化胁迫效应，低浓度Cs+复合处理[ρ（CdCl2）20 mg·L-1+ρ（CsCl）20 mg·L-1]具有对Cd2+毒害的缓解作用，但高浓度Cs+复合处理[ρ（CdCl2+CsCl）20 mg·L-1+60~140 mg·L-1]则产生显著的伤害性协同效应。 |
| 英文摘要: |
| The biological effects of cesium（Cs+） in coexisting system of cesium and cadmium（Cd2+/Cs+） were studied by analysing characteristics of seed germination in chicory（Cichorium intybus L.）, contents of protein and proline, and metabolic changes of reactive oxygen species（ROS） with Cs+ single factor treatments[ρ（CsCl）20~140 mg·L-1] and Cd2+/Cs+ combined treatments[ρ（CdCl2+CsCl） 20 mg·L-1+20~140 mg·L-1] in seedlings. The results showed that：（1）As the increase of different Cs+ single factor processing concentration, there were no significant difference in germination potential（GP）, germination rate（GR） and germination index（GI）; there were the trends in which the soluble protein contents were generally declined, the contents of proline, H2O2 and MDA, O-2· productive rate, the activities of SOD and CAT were increased in general, and POD activities were improved.（2）In coexisting system of cesium and cadmium（Cd2+/Cs+）, SOD activities and O-2· productive rate were raised at first and then decreased as the Cs+ concentration improved, but there were the same trend as Cs+ single factor treatments about proline contents, CAT activities and others.（3）In comparison with the Cs+ single factor treatments, the soluble protein contents and SOD activities were lower, others were higher generally. It was concluded that there were no significant effects on the growth and ROS metabolism in chicory seedling under lower Cs+ single factor concentration[ρ（CsCl）20 mg·L-1], but the severe peroxide injure were produced by treatments with higher Cs+ single factor concentration[ρ（CsCl）60~140 mg·L-1] and Cd2+/Cs+ combined. There were possible alleviation of Cd toxicity under lower Cs+ concentration of Cd2+/Cs+ combined[ρ（CdCl2）20 mg·L-1+ρ（CsCl）20 mg·L-1], but there were obvious harmful synergistic effects under higher Cs+ concentration of that[ρ（CdCl2+CsCl）20 mg·L-1+60~140 mg·L-1]. |
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