Difference Characteristics of Cadmium Uptake and Accumulation of 25 Spinach Varieties
In order to screen the low Cd accumulation spinach varieties which are suitable for safe production of vegetables in cadmium contaminated vegetable fields,the soil culture experiment was conducted in this study,the differences of Cd uptake and accumulation in 25 spinach cultivars and the effects of Cd stress on micronutrient uptake in spinach were studied.The results showed that there were significant differences in Cd content and Cd enrichment coefficient(P＜0.05)in the aboveground parts of different spinach cultivars when the same Cd content(1.0,5.0 mg/kg)was added to the soil.When the Cd content in soil was 1.0 mg/kg,the Cd content in 11 spinach varieties was more than 0.2 mg/kg,and the Cd content in aboveground parts of different spinach varieties ranged from 0.03 to 0.31 mg/kg,with an average content of 0.17 mg/kg,the enrichment coefficients of 25 spinach varieties ranged from 0.03 to 0.38.When the Cd content in soil was 5.0 mg/kg,the Cd content in aboveground parts of different spinach varieties ranged from 0.22 mg/kg to 1.11 mg/kg,the enrichment coefficients range from 0.04 to 0.22.Cd stress promoted the absorption of Mn,Zn and Cu by spinach,and inhibited the absorption of Fe by spinach.The spinach varieties of'Jingbo 186','Qiuxi','Juyuanba'and'Dingyou'were identified as low cadmium uptake and accumulation varieties.
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