The effect of pH and plaque on the uptake of Cu and Mn in Phragmites australis (Cav.) Trin ex. Steudel
The effect of pH and plaque on the uptake of Cu and Mn in Phragmites australis (Cav.) Trin ex. Steudel
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DOI：
10.1006/anbo.2000.1191
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发表时间：
2000-09-01
期刊：
影响因子：
4.2
通讯作者：
Curtis, CD
中科院分区：
文献类型：
--
作者：
Batty, LC;Baker, AJM;Curtis, CD
利用电子显微镜和能谱分析技术，测定了田间和室内条件下芦荟根部形成的氢氧化铁斑块的物理化学性质。菌斑以无定形涂层形式存在于根部，分布不均。在现场和实验室中都发现它们是由铁组成的，并发现磷被吸附在实验室形成的斑块的表面上。在两种不同的pH条件下，研究了有菌斑和无菌斑的水体对铜和锰的吸收。在较高pH(6.0)的生长条件下，有菌斑的南瓜地上部铜含量(565 mg kg~(-1))低于无菌斑(1400 mg kg~(-1))。铜和锰在菌斑表面的吸附不是菌斑减少其他金属摄取的机制。或者，斑块可能只是起到物理屏障的作用。在较低的pH(3.5)条件下，根表面的氢离子活性干扰了金属进入根部的运动，并掩盖了铁菌斑的任何潜在影响。(C)2000年植物学公司年鉴。
The physico-chemical properties of iron oxyhydroxide plaques formed on the roots of Phragmites australis under field and laboratory conditions were determined using electron microscopy and energy dispersive spectrometry (EDS) analysis. Plaques were present as an amorphous coating on roots with an uneven distribution. They were shown to be composed of iron in both the field and laboratory, and phosphorus was found to be adsorbed onto the surface of plaques formed in the laboratory. The uptake of copper and manganese in the presence and absence of plaque was investigated under two different pH regimes. Concentrations of Cu were lower in the shoots of P. australis in the presence of plaque (565 mg kg(-1)) than when it was absent (1400 mg kg(-1)), under growth conditions of higher pH (6.0). The adsorption of Cu and Mn onto the plaque surface was not the mechanism by which plaque reduced the uptake of other metals. Alternatively, the plaque may simply act as a physical barrier. Under conditions of lower pH (3.5) the activity of hydrogen ions at the root surface interfered with the movement of metals into the root and masked any potential effect of iron plaque. (C) 2000 Annals of Botany Company.