不同生育期类型水稻对镉积累的研究

Cd Accumulation in Japonica Rice Relative to Growth Type

  • 摘要: 以江苏省有代表性的早熟中粳、中熟中粳、迟熟中粳、早熟晚粳和中熟晚粳5种生育期类型的56个粳稻品种为材料,在Cd污染农田中研究不同生育期类型粳稻品种的Cd积累特性。结果表明,56个供试水稻品种籽粒Cd含量变化范围为0.014~0.054 mg•kg-1,水稻籽粒Cd含量在品种间差异显著(P<0.05),其中籽粒Cd含量最高的品种是ELTO,扬粳687、泗阳1382、广陵香粳和武香粳9号水稻籽粒Cd含量较低。不同生育类型水稻籽粒Cd含量以早熟中粳较高,中熟中粳较低,分别为0.024和0.020 mg•kg-1。不同生育期类型水稻籽粒Cd富集系数差异不显著,而不同生育期类转运系数存在差异。

     

    Abstract: The experiment was set to investigate accumulation of cadmium in 56 varieties of Japonica rice of 5 different growth types growing in cadmium-polluted farmlands. The 5 growth types include early-maturity (125–135 d), mid-maturity (136–145 d) and late-maturity (146–155 d) mid-japonica rice and early-maturity (156–165 d) and mid-maturity (166–175 d) late-japonica rice. Results show that Cd concentration in grain of the 56 varieties of rice varied from variety to variety sharply in the range of 0.014-0.054 mg•kg-1 (P<0.05).For Cd concentration in grains among the 56 varieties, ELTO was the highest and Yangjing 687, Siyang 1382, Guanglingxiangjing and Wuxiangjing 9 were lower. For the 5 growth types, the type of early-maturity mid-japonica rice was higher and the type of mid-maturity mid-japonica rice was lower in Cd concentration, being 0.024 and 0.020 mg•kg-1, respectively. The difference between the types of japonica rice was not significant in Cd accumulation coefficient, but significant in Cd transfer coefficient.

     

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