核农学报2018，Vol.32Issue(5)：1009-1015,7.DOI:10.11869/j.issn.100-8551.2018.05.1009
无瓣蔊菜对镉的积累特性研究
Accumulation Characteristics of Codmium in Rorippa dubia (Pers.) Hara
摘要
Abstract
In order to achieve the goal of ecological restoration,eliminating heavy metals in soil using hyperaccumulator is a new technology developed in the field of environmental protection in recent years.Therefore,it is very important to screen more hyperaccumulators from farmland weeds.In order to reveal the remediation potential of Rorippa dubia (Pers.) Hara to cadmium contaminated soil,CdCl2·2.5H2O was used to simulate different concentrations of cadmium stress,and the accumulation characteristics of cadmium in R.dubia planted in pots for 60-days stress treatments were detected,with no added CdCl2·2.5H2O as control.The results showed that with the increase of soil Cd concentration,the growth of R.dubia was inhibited without toxic symptoms;When the soil cadmium concentration was less than or equal to 75 mg· kg-1,the percentages of chlorophyll a,chlorophyll b,total chlorophyll,and the carotenoid contents were decreased but no significant difference was found compared with that of the control.After treated with soil cadmium concentration of 75 mg· kg-1,cadmium content in shoots and roots of R.dubia was 112.77 mg· kg-1,69.87 mg· kg-1,respectively.Moreover,the bioconcentration factors (BCF) of roots and shoots,and the transfer factors (TF) were larger than 1,suggesting that R.dubia was a cadmium-rich plant.With the increasing concentration of cadmium in soil,transfer amount factors(TAF) of R.dubia showed the trend of first increasing and then decreasing,indicating that the transport capacity from roots to the shoots part of R.dubia gradually increased when the concentration of Cd in soil is less than or equal to 50 mg· kg-1.Under these conditions,it is advantageous to accumulation of cadmium in R.dubia.The regression analysis of the cadmium accumulation of R.dubia showed that the distribution characteristics of cadmium in R.dubia followed the order of shoots ＞ roots.In summary,R.dubia can be used as phytoremediation of heavy metal cadmium and absorb cadmium in the soil by transferring the cadmium from roots to shoots.After harvest the plants were removed from soil to achieve the purpose of repairing cadmium pollution.This study provides a basis for screening superior Cd-enriched plant material.关键词
无瓣蔊菜/镉含量/积累特性/农田杂草/植物修复Key words
Rorippa dubia (Pers.) Hara/cadmium content/characteristics of accumulation/farmland weeds/phytoremediation引用本文复制引用
刘鲡,陈杨晗,周莉君,刘静,林立金,廖明安,廖进秋..无瓣蔊菜对镉的积累特性研究[J].核农学报,2018,32(5):1009-1015,7.基金项目
四川省教育厅重点项目(14ZA0008) （14ZA0008）
