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[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. [ABSTRACT FROM AUTHOR]

[Objective]The experimental objective was to investigate the effect of cadmium stress on root activity and mineral nutrient elements absorption of Iris lacteal. [Method] In order to explore the effect of cadmium stress on root activity and the absorption of mineral nutrient elements of Iris lacteal, a hydroponic culture experiment was carried out to examine the root activity, the absorption of cadmium and six kinds of mineral nutrient elements (Ca, Mg,Fe, Mn, Cu ,Zn) in the aerial part and root of Iris lacteal under different CdCl2 mass concentrations (0, 10,25 ,50,100,150 mg.L-1)were investigated. [Result]The root activity increased in the absence of Cd (0 mg.L-1) with the prolonging stress days, and the root activity increased first and then decreased in 10-50 mg.L-1, while it decreased between 100 and 150 mg.L-1 Cd. The content of Mg,Mn,Cu and Zn decreased significantly and Ca and Fe content increased in the aerial part, while the content of Fe, Mn,Cu and Zn increased and Ca and Mg content decreased in root with increasing cadmium stress. The translocation factors of Ca and Mg increased and then decreased with increasing cadmium stress,the translocation factors of Mn,Cu and Zn decreased when compared to control, while there was no significant influence on Fe. Under cadmium stress,for their contents in the aerial part, significant and positive correlations between the content of Cd and Fe, and Cd showed significant and negative correlations with Ca,Cu,Zn,Mg,Mn. In the roots, Cd showed positive correlations with Cu,Zn,Mg,Mn and Fe, and significant and negative correlations between the content of Ca. The Cd content in roots was 829. 39-8944. 54 mg.L-1 , while the Cd content in shoots was 200. 60 -519. 76 mg.L-1 , suggesting that cadmium is mainlyaccumulated in the root of Iris lacteal seedlings, therefore, the Iris lacteal had the ability to retain the cadmium in the root to reduce the cadmium transfer to the shoot. [Conclusion] Under low cadmium concentration treatment conditions, root activity and mineral nutrient elements absorption of Iris lacteal were less affected by cadmium. The root activity of Iris lacteal decreasedat high cadmium concentration, and it could regulate the nutrient element uptake and distribution against cadmium stress in some scope. [ABSTRACT FROM AUTHOR]

Field investigation and the mathematical statistic method were conducted to investigate the effect of environmental factors on the cadmium uptake of heavy metals in rice. The results showed that there was a negative correlation between Cd and soil pH, Mn, Fe, Zn, Mg, Mn, and among them the soil pH were significantly negative correlated with Cd (- 0. 672) ; whereas the correlation coefficient between Cd, the soil organic matter, available Cd, and total Cd were positively correlated, in which the soil organic matter and available Cd were significantly positive correlated with Cd. The correlation coefficients were 0. 579 and 0. 631 , respectively. [ABSTRACT FROM AUTHOR]