镉污染来源对萝卜镉积累特性的影响  

Effects of Cadmium Pollutant Sources on the Accumulation Characteristics of Radish

作　　者：高子平[1,2] 王龙[2] 尹洁[1,2] 崔冠男[1,2] 王景安[1] 刘仲齐[1,2] 

机构地区：[1]天津市动植物抗性重点实验室天津师范大学生命科学学院,天津300387 [2]农业部环境保护科研监测所生态毒理与环境修复研究中心,天津300191

出　　处：《天津农业科学》2015年第11期37-41,共5页Tianjin Agricultural Sciences

基　　金：2015年中国农科院科技创新工程项目(2015-cxgc-lzq)

摘　　要：以红樱桃萝卜(Raphanus sativus L.var.radculus pers)为材料,对根际环境中和叶片中的镉(Cd)浓度与Cd在萝卜体内转运积累的关系进行了研究。结果表明:萝卜根部组织中的Cd含量随根际环境中Cd浓度的增加而增加,根部次生韧皮部对Cd的积累量明显大于次生木质部。在高Cd环境中次生木质部中的Cd吸收量与次生韧皮部中的Cd含量呈极显著正相关。萝卜根系次生木质部中Cd积累量与叶柄和叶片中的Cd含量高度正相关,根系中的Cd主要通过次生木质部转运到叶柄和叶片中。叶片中的Cd主要通过次生木质部向根系转运,到达根系向外扩散到次生韧皮部,向内扩散到初生木质部。Red Cherry Belle Radish（Raphanus sativus L.var.radculus pers）was used to study the relationship between the transport and accumulation of cadmium（Cd）inside radish and Cd content in the rhizosphere environment as well as in leaves. The results showed that the content of Cd in root tissue was increased with the increasing of Cd concentration in rhizosphere environment and Cd content in the secondary phloem was apparently higher than that in the secondary xylem. Cd accumulation in the secondary xylem was significantly and positively correlated with the Cd content in the secondary phloem when radish was planted in high Cd concentration environment. Cd accumulation in the secondary xylem of root tissues was significantly and positively correlated with the Cd content in lamina and petiole organs. Cd in lamina and petiole organs was transferred from root mainly by the secondary xylem. Cd in lamina can also be transferred to root by the secondary xylem, and then diffused to the secondary phloem and primary xylem.

关 键 词：萝卜 镉 木质部 韧皮部 转运 

分 类 号：X53[环境科学与工程—环境工程]