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Cd-accumulation characteristics of Brassica cultivars and their potential for phytoremediating Cd-contaminated soils

WANG Song-liang, ZHENG Jin-gui (Laboratory of Quality Bio-technology, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China)  
Cd-accumulation characteristics of 13 Brassica chirensis cultivars and 11 B.oleracea cultivars were investigated. The results showed that there was extremely significant difference (P0.001) between Cd contents in the shoot of different cultivars under 5 Cd concentrations (i.e. 0, 25, 50, 125 and 250 μmol·L~(-1)) supplied in water culture. There were three types of shoot Cd concentration among different cultivars with the increase of Cd supply, which were single-peak, double-peak and constantly-increasing. While taking bioconcentration factor (BCF) as index, however, there were only two types, namely constantly-decreasing and single-peak. In the former type, taking the cultivar Invinto as an example, the highest BCF was 146.85, and it decreased with the increase of Cd supply. In the latter type, taking the cultivar 94-N1 as an example, with the increase of Cd supply, BCF increased and reached the peak value 72.95 while Cd concentration being at 50 μmol·L~(-1), then decreased. It was concluded that BCF is more appropriate index than Cd content in shoot for screening the plant materials for phytoremediating Cd-contaminated soil, and cultivars Fulu No.1, 94-N1, Japanese Huaguan, Japanese Dongfei, Hongqiaoaiqing of B.chirensis and Ducati, Matsumo, Gideon, Invinto of B.oleracea are the potential materials for phytoremediating Cd pollutant in soil under our experimental condition.
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