植物对重金属镉的耐受机制

被引:93
作者
张军
束文圣
机构
[1] 中山大学生命科学学院,生物防治国家重点实验室
关键词
镉; 耐性; 解毒; 转运;
D O I
暂无
中图分类号
Q945.78 [协迫生理学];
学科分类号
摘要
镉离子(Cd2+)具有强植物毒性,抑制植物生长,甚至使植物死亡。由于长期的环境选择和适应进化,植物发展出耐受机制,可减轻或避免Cd2+的毒害。硫转运蛋白、硫还原相关酶类以及半胱氨酸、谷胱甘肽和植物螯合肽合成基因的表达受Cd2+调控。同时这些基因的过表达也能提高植物对Cd2+的耐性。植物抗氧化系统对Cd2+胁迫诱发的活性氧的清除作用,具转运Cd2+活性的质膜转运蛋白促进Cd2+经共质体途径向木质部运输、装载,而后随蒸腾流向地上部迁移,具转运Cd2+活性的液泡膜转运蛋白促进Cd2+进入液泡的隔离作用,都在植物对Cd2+的耐性中起作用。
引用
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页码:1 / 8
页数:8
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