Liu Hou-jun, Hu Xiang-bai, Zhang Jun-ling, Zhang Fu-suo
Key Laboratory of Plant-Soil Interactions of Education Ministry, Department of Plant Nutrition, College of Agricultural Resources and Environmental Sciences, China Agricultural University, Beijing 100094, China.
Ying Yong Sheng Tai Xue Bao. 2007 Feb;18(2):425-30.
In a water culture experiment, rice seedlings were grown in a nutrient solution containing 10 micromol Cd x L(-1), and harvested after different durations of growth. Two treatments were installed, i. e. , adding 50 mg Fe2+ x L(-1) to induce the formation of iron coating on seedlings root surface (treatment Fe50), 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 Fe50 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 Fe50 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 Fe50 was probably relevant with the Fe concentration in roots.
在一项水培实验中，水稻幼苗种植在含有10微摩尔镉每升的营养液中，并在不同生长时长后收获。设置了两个处理，即添加50毫克亚铁离子每升以诱导幼苗根表面形成铁膜（处理Fe50）和对照处理。对根表面镉吸附动力学和植物对镉吸收的研究表明，在处理Fe50和对照处理中，根表面吸附的镉量在前2小时最高，随后急剧下降并在此后保持相对稳定，而根和地上部的镉浓度在前8小时内缓慢增加，之后迅速增加。处理Fe50中根和地上部镉浓度的增加幅度小于对照处理，吸附和吸收的镉量也呈现相同情况，这表明水稻根表面的铁膜对水稻幼苗不同部位镉含量的动态变化影响不大，处理Fe50中镉吸收减少可能与根中的铁浓度有关。
