Dynamics of Cd adsorption on rice seedlings root surface with iron coating and Cd uptake by plant
Liu, H-jun.; Hu, X-bai.; Zhang, J-ling.; Zhang, F-suo.
Ying Yong Sheng Tai Xue Bao 18(2): 425-430
2007
ISSN/ISBN: 1001-9332 PMID: 17450751 Document Number: 614442
In a water culture experiment, rice seedlings were grown in a nutrient solution containing 10 mu mol Cd center dot L-1, and harvested after different durations of growth. Two treatments were installed, i. e., adding 50 mg Fe2+ center dot L-1 to induce the formation of iron coating on seedlings root surface (treatment Fe-50), and the control. The study on the dynamics of the Cd adsorption on root surface and of the Cd uptake by plant showed that both in the treatment Fe-50 and in the control, the amount of adsorbed Cd on root surface was the highest in the first 2 hours, decreased dramatically then and remained relatively stable thereafter, while the Cd concentrations in roots and shoots increased slowly within the first 8 hours and rapidly then. The increment of Cd concentrations in roots and shoots was smaller in treatment Fe-50 than in the control, and the amounts of adsorbed and absorbed Cd also showed the same picture, suggesting that the iron coating on rice root surface had little effect on the dynamics of Cd content in different parts of rice seedlings, and the reduced Cd uptake in treatment Fe-50 was probably relevant with the Fe concentration in roots.