A newly-discovered Cd-hyperaccumulator Solanum nigrum L.  

作　　者：WEIShuhe ZHOUQixing WANGXin ZHANGKaisong GUOGuanlin MALenaQiying 

机构地区：[1]KeyLaboratoryofTerrestrialEcologicalProcess,InstituteofAppliedEcology,ChineseAcademyofSciences,Shenyang110016,China

出　　处：《Chinese Science Bulletin》2005年第1期33-38,共6页

基　　金：the National Natural Science Foundation of China as the outstanding young scientist grant(Grant No.20225722); the overseas young scientist grant(Grant No.20428707).

摘　　要：A systematic investigation was conducted to screen for cadmium-hyperaccumulator from 54 species in 20 weed families using outdoor pot-culture experiment and small-scale field experiment. The results from the outdoor pot-culture experiment showed that Cd concentrations in the stems and leaves of Solanum nigrum L. growing in a soil spiked with 25 mg/kg Cd were up to 103.8 and 124.6 mg/kg (DW), respectively, which was greater than 100 mg/kg, minimum Cd concentration for a Cd-hyperaccumulator. The Cdenrichment factor(EF,concentration ratio in plant to soil) in shoots was as high as 2.68. Moreover, Cd accumulation in shoots was greater than that in roots (TF, concentration ratio in shoots to roots) and the plant biomass growth was not inhibited at the Cd concentrations tested compared with the control. The results of the small-scale field experiment also showed that the characteristics of Cd accumulation in S. nigrum were all consistent with the characteristics of Cd-hyperaccumulators. Thus S. nigrum can be classified as a Cd-hyperaccumulator. This work is important for further research in the areas of hyperaccumulators screening, and plant-tolerance physiology and evolution. It provides a pat- entable new plant species for phytoremediation of Cd-con- taminated soils.A systematic investigation was conducted to screen forcadmiuni-hyperacciimulator from 54 species in 20 weed families using outdoor pot-culture experimentand small-scale field experiment. The results from the outdoor pot-culture experiment showed that Cdconcentrations in the stems and leaves of Solatium migrant L. growing in a soil spiked with 25nig/kg Cd were up to 103.8 and 124,6 mg/kg (DW), respectively, which was greater than 100 mg/kg,minimum Cd concentration for a Cd-hyperaccHmulator. The Cd enrichment factor (EF, concentrationratio in plant to soil) in shoots was as high as 2.68. Moreover, Cd accumulation in shoots wasgreater than that in roots (TF, concentration ratio in shoots to roots) and the plant biomass growthwas not inhibited at the Cd concentrations tested compared with the control. The results of thesmall-scale field experiment also showed that the characteristics of Cd accumulation in S. nigrumwere all consistent with the characteristics of Cd-hyperaecumulators. Thus S. nigrum can beclassified as a Cd-hyperaccumulator. This work is important for further research in the areas ofhyperaccumulators screening, plant-tolerance physiology and evolution. It provides a pat-entable newplant species for phytoremediation of Cd-eon-taniinated soils.

关 键 词：镉-超量聚积植物 龙葵 污染土壤 药物污染 生物修复 

分 类 号：X53[环境科学与工程—环境工程] X173