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| 硒缓解植物重金属胁迫和累积的机制 |
| Mechanisms of Selenium Mitigating Stress and Accumulation of Heavy Metals in Plants |
| Received:September 26, 2014 |
| DOI：10.13254/j.jare.2014.0251 |
| 中文关键词: 硒;重金属;胁迫;累积 |
| 英文关键词: selenium;heavy metal;stress;accumulation |
| 基金项目:国家自然科学基金项目(41073094,41471271);公益性行业(农业)科研专项(201303106) |
| Author Name | Affiliation | E-mail | | YUAN Si-li | 中国农业大学资源与环境学院, 北京 100193 | | | YU Yao | 中国农业大学资源与环境学院, 北京 100193 | | | WAN Ya-nan | 中国农业大学资源与环境学院, 北京 100193 | | | WANG Qi | 中国农业大学资源与环境学院, 北京 100193 | | | QIAO Yu-hui | 中国农业大学资源与环境学院, 北京 100193 | | | LI Hua-fen | 中国农业大学资源与环境学院, 北京 100193 | lihuafen@cau.edu.cn |
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| 中文摘要: |
| 硒(Se)在提高植物抗逆性、缓解重金属胁迫以及降低植物对重金属吸收方面有着重要的作用。本文综述了Se参与缓解植物重金属胁迫和累积的机制,Se能够缓解重金属的胁迫,主要是因为在植物体内由Se转化而来的相关产物的生理生化作用产生的综合效果。Se是谷胱甘肽过氧化物酶(GSH-Px)的必需组分,GSH-Px利用谷胱甘肽(GSH)将有毒的过氧化物还原成无毒的物质,清除由重金属引起的自由基。Se可以激活植物螯合肽(PC)合成酶及增加PC合成的前体,使植物产生更多的PC,形成更多的重金属-PC配合物。Se还可以与重金属形成大分子的复合物,降低重金属的毒害。Se能够与多种重金属元素产生拮抗效应,降低植物对重金属的吸收。 |
| 英文摘要: |
| Selenium (Se) plays an important role in improving plant stress resistance, mitigating heavy metal stress and reducing heavy metal uptake. This paper reviewed mechanisms involved with Se for mitigation of heavy metal stress and accumulation. Se could alleviate heavy metals stress because of the combined physiological and biochemical effects of the relevant products, including GSH-Px which could change toxic peroxides to non-toxic substances and remove free radicals induced by heavy metals. Se could activate phytochelatins synthase and increase the amount of precursors to phytochelatin (PC), and make plant produce more PC, and form more heavy metal-PC complexes. The formation of Se-heavy metal complexes reduced the biotoxicity of heavy metals. Se could produce antagonistic effect with a variety of heavy metals, and reduce the uptake of heavy metals. |
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