重金属镉(Cd)在植物体内的转运途径及其调控机制

被引:115
作者
王晓娟 [1 ]
王文斌 [2 ]
杨龙 [2 ]
金樑 [1 ]
宋瑜 [2 ]
姜少俊 [2 ]
秦兰兰 [3 ]
机构
[1] 上海科技馆,上海自然博物馆自然史研究中心
[2] 兰州大学,草地农业科技学院
[3] 兰州大学,资源环境学院
关键词
重金属; 镉; 共质体途径; 质外体途径; 调控机制;
D O I
暂无
中图分类号
X173 [环境植物学]; Q945 [植物生理学];
学科分类号
071012 ; 0713 ; 0903 ;
摘要
重金属镉(Cd)的毒害效应与其由土壤向植物地上部分运输有关,揭示Cd2+转运途径及其调控机制可为提高植物抗镉性以及镉污染的植物修复提供依据。对Cd2+在植物体内的转运途径,特别是限制Cd2+移动的细胞结构和分子调控机制研究进展进行了回顾。Cd2+通过共质体和质外体途径穿过根部皮层进入木质部的过程中,大部分在皮层细胞间沉积,少部分抵达中柱后转移到地上部分。为了免受Cd2+的危害,植物体产生了多种限制Cd2+吸收和转移的生理生化机制:1)环绕在内皮层径向壁和横向壁上的凯氏带阻止Cd2+以质外体途径进入木质部;2)螯合剂与进入根的Cd2+螯合形成稳定化合物并区隔在液泡中;3)通过H+/Cd2+离子通道等将Cd2+逆向转运出根部。植物共质体和质外体途径转运重金属镉的能力以及两条途径的串扰尚待进一步明晰和阐明。
引用
收藏
页码:7921 / 7929
页数:9
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