School of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
School of Environment and Energy, South China University of Technology, Guangzhou 510006, China ; The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China.
Bioinorg Chem Appl. 2013;2013:959764. doi: 10.1155/2013/959764. Epub 2013 Nov 21.
Maize is an economic crop that is also a candidate for use in phytoremediation in low-to-moderately Cd-contaminated soils, because the plant can accumulate high concentration of Cd in parts that are nonedible to humans while accumulating only a low concentration of Cd in the fruit. Maize cultivars CT38 and HZ were planted in field soils contaminated with Cd and nitrilotriacetic acid (NTA) was used to enhance the phytoextractive effect of the maize. Different organs of the plant were analyzed to identify the Cd sinks in the maize. A distinction was made between leaf sheath tissue and leaf lamina tissue. Cd concentrations decreased in the tissues in the following order: sheath > root > lamina > stem > fruit. The addition of NTA increased the amount of Cd absorbed but left the relative distribution of the metal among the plant organs essentially unchanged. The Cd in the fruit of maize was below the Chinese government's permitted concentration in coarse cereals. Therefore, this study shows that it is possible to conduct maize phytoremediation of Cd-contaminated soil while, at the same time, harvesting a crop, for subsequent consumption.
玉米是一种经济作物，也是中低水平镉污染土壤植物修复的候选作物，因为植物可以在不可食用的部位积累高浓度的镉，而在果实中仅积累低浓度的镉。将 CT38 和 HZ 两个玉米品种种植在受镉污染的田间土壤中，并使用氮三乙酸（NTA）来增强玉米的植物提取效果。分析了植物的不同器官，以确定玉米中的镉汇。区分了叶鞘组织和叶片组织。组织中的 Cd 浓度按以下顺序降低：鞘>根>叶>茎>果。添加 NTA 增加了 Cd 的吸收量，但基本保持了金属在植物器官中的相对分布不变。玉米果实中的 Cd 含量低于中国政府规定的粗粮允许浓度。因此，这项研究表明，在收获可食用作物的同时，进行玉米修复受镉污染的土壤是可行的。
