MEASUREMENT OF PB-2+,CU-2+ AND CD-2+ BINDING WITH MUCILAGE EXUDATES FROM MAIZE (ZEA-MAYS-L) ROOTS
MEASUREMENT OF PB-2+,CU-2+ AND CD-2+ BINDING WITH MUCILAGE EXUDATES FROM MAIZE (ZEA-MAYS-L) ROOTS
复制标题
DOI：
10.1007/bf00638958
复制
发表时间：
1986-01-01
影响因子：
6.5
通讯作者：
GUCKERT, A
中科院分区：
文献类型：
--
作者：
MOREL, JL;MENCH, M;GUCKERT, A
根粘液的果胶性质表明，这些物质对进入根部的重金属通量具有假想的作用。本研究验证并量化了重金属与根部粘液之间的关系。为了获得大量的纯根粘液，开发了两种收集方法：(1)田间种植的玉米植株和(2)水培无菌培养物。粘液-金属结合的研究是使用先前工作中发展的透析法进行的。结果表明，根部粘液具有结合金属的能力。结合的重要性取决于阳离子的性质，遵循铅&>铜>镉的顺序。这些反应可能是由于粘液阳离子(钙、镁)和重金属的交换过程所致。文中还讨论了粘液对根际重金属滞留的作用。
The pectic nature of root mucilages suggests a hypothetical action of these substances on heavy metal flux into the root. In this study the existence of relations between heavy metals and root mucilages were verified and quantified. In order to obtain substantial amounts of pure root mucilages, two methods of collection were developed, using: (1) maize plants grown in the field and (2) hydroponic axenic cultures. The study of mucilage-metal binding was conducted using the dialysis method, which was developed in a previous work. Results show that root mucilages are able to bind metals. The importance of the binding depends on the nature of the cation, following the order Pb > Cu > Cd. These reactions could be due to exchange processes involving mucilage cations (Ca2+, Mg2+) and heavy metals. The role of mucilages on the retention of heavy metals in the rhizosphere is also discussed.