铁锰氧化肠杆菌和丛毛单胞菌对小白菜吸收镉和砷的影响
Effects of iron-and manganese-oxidizing Enterobacter and Comamonas on absorption of cadmium and arsenic in Brassica rapa L.
霍雪琪 1王杏 1叶林繁 1史凯祥1
作者信息
- 1. 华中农业大学生命科学技术学院/农业微生物资源发掘与利用全国重点实验室,武汉 430070
- 折叠
摘要
为探究土壤中镉(cadmium)和砷(arsenic)共去除的可行方法,选取具有铁锰氧化能力的细菌肠杆菌A11和丛毛单胞菌A23,研究混合菌株介导生成生物铁锰氧化物对镉和砷的吸附效果.扫描电镜结果显示铁锰氧化物存在于细胞表面,并且铁锰氧化物使细菌聚集成团;盆栽试验结果显示A11和A23菌株能够钝化土壤中的镉和砷,降低生物可利用态镉和砷的比例,并增加其不可利用态比例,同时还抑制小白菜地上部分和根部对镉和砷的吸收与积累.以上结果表明A11和A23混合菌株生成的生物铁锰氧化物对镉和砷有良好的吸附效果.
Abstract
Enterobacter sp.A11 and Comamonas sp.A23 with the ability to oxidize Fe and Mn com-pounds was used to study the feasible methods for co-removing the cadmium(Cd)and arsenic(As)in soil.The effects of the biological Fe and Mn oxides(BFMO)generated by the mixed strains of A11 and A23 on the absorption of cadmium and arsenic in B.rapa.The results of scanning electron microscopy(SEM)showed that iron and manganese oxides were located on the surface of cells and led bacteria to ag-gregate into clusters.The results of pot experiment showed that strains A11 and A23 immobilized Cd and As in soil,reduced the proportion of bioavailable Cd and As,increased the proportion of unavailable Cd and As,and exhibited the absorption and accumulation of Cd and As in the aboveground and root parts of Bras-sica rapa L.as well.It is indicated that the biological iron manganese oxide generated by the mixed strains of A11 and A23 has a good adsorption effect on cadmium and arsenic in B.rapa.
关键词
肠杆菌/丛毛单胞菌/生物铁锰氧化物/镉/砷Key words
Enterobacter/Comamonas/biological iron manganese oxide/cadmium/arsenic引用本文复制引用
出版年
2024
NETL
NSTL
万方数据