镉对不同品种水稻地下部矿质元素吸收的影响

Effects of Cadmium Stress on Uptake and Transport of Mineral Elements in Different Rice Varieties

【目的】为探究水稻地下部在镉胁迫下对矿质元素吸收的影响。【方法】本试验选取29个水稻品种,设置两组Cd处理(0、0.5 mg/kg),利用原子吸收火焰分光光度计法对水稻地下部中8种矿质元素(Ca、Fe、Zn、Mg、Cu、Mn、K、Na)含量进行测定。【结果】在地下部中,与对照组相比,Cd对Fe的影响表现为抑制吸收;Zn、Mg、K和Na对Cd具有耐受性,Zn的耐受性大于Cu,Cd的竞争性大于Mn,Mg的耐Cd性和竞争性大于Ca。【结论】竹珍B和粳7623在8种矿质元素中表现出耐Cd性,竹珍B是唯一在Cd胁迫后促进8种矿质元素吸收的水稻品种;柳沙1号是最不耐Cd的水稻品种。

【Objective】The present paper aimed to explore the effects of Cd stress on the absorption and transport of mineral elements in rice.【Method】29 rice varieties were selected and treated with two groups(0,0.5 mg/kg).The contents of eight mineral elements(Ca,Fe,Zn,Mg,Cu,Mn,K,Na)in the upper and lower parts of rice were measured by atomic absorption flame spectrophotometer.【Result】In the underground part,compared with control group,the effect of Cd on Fe was shown to inhibit absorption;Zn,Mg,K and Na were resistant to Cd,and Zn was more resistant than Cu,and Cd was more competitive than Mn and Mg.Its Cd resistance and competitiveness were greater than that of Ca.Zhuzhen B and Japonica 7623 showed Cd tolerance among the eight mineral elements.【Conclusion】Zhuzhen B was the only rice variety that promoted the absorption of eight mineral elements after Cd stress;Liusha 1 was the least Cd-tolerant rice variety.