大白菜(Brassica pekinensis L.)对镉富集基因型差异的研究

研究了15种大白菜基因型对镉(Cd)富集的基因型差异,以期筛选出低积累Cd的白菜基因型.盆栽试验结果表明,不同白菜基因型的Cd含量、富集系数(BFs)和转运系数(TFs)差异显著(P0.05).丰源新3号、现代夏秋和春秋六轮的Cd积累量均小于0.50mg/kg,其富集系数和转运系数都小于1.0,具有一定低积累Cd的潜力.大田试验的结果表明丰源新3号的Cd含量小于0.50mg/kg,富集系数和转运系数均小于1.0,表明其为排斥Cd的白菜基因型.现代夏秋和春秋六轮的富集系数和转运系数均小于1.0,但其地上部Cd含量均高于0.50mg/kg,不属于Cd低积累白菜.值得注意的.北京小杂56在盆栽和大田中的Cd含量、富集系数和转运系数均大于1.0,可用于植物修复污染土壤.

Genotypic Variation of Cadmium Accumulation in Chinese cabbage (Brassica pekinensis L.)

Genotypic variation of cadmium accumulation among 15 Chinese cabbage genotypes was studied in this paper to screen out the genotypes with low-Cd accumulation. It was observed in the pot-culture experiment that significant differences (P <0.05) occurred in Cd accumulation, bioaccumulation factors (BFs) and translocation factors (TFs) among different genotypes. Cd concentrations in Fengyuanxin 3, Xiandaixiaqiu and Chunqiuliulun were all lower than 0.50mg/kg. Meanwhile, the BFs and TFs were lower than 1.0, which indicated they were potential low-Cd accumulating genotypes. The results in the field-culture experiment showed that Cd concentration in Fengyuanxin 3 was still lower than 0.50mg/kg and the BFs and TFs were both lower than 1.0, which further revealed it was a Cd excluder. Although the BFs and TFs of Xiandaixiaqiu and Chunqiuliulun were lower than 1.0, Cd concentration in them exceeded 0.50mg/kg, which implied that they were not Cd excluder. Noticeably, Cd concentration, the BFs and TFs in Beijingxiaoza 56 were all higher than 1.0 in the pot-culture experiment and field-culture experiment, which implied that it could be used to phytoremediate polluted soils.