期刊
NEW PHYTOLOGIST
卷 165, 期 3, 页码 781-789出版社
WILEY
DOI: 10.1111/j.1469-8137.2004.01264.x
关键词
ferritin; Imperata cylindrica; iron bioformations; iron oxides; iron oxyhydroxides; jarosite; Mossbauer spectroscopy; Tinto River
The analysis of metal distribution in Imperata cylindrica, a perennial grass isolated from the banks of Tinto River (Iberian Pyritic Belt), an extreme acidic environment with high content in metals, has shown a remarkable accumulation of iron. This property has been used to study iron speciation and its distribution among different tissues and structures of the plant. Mossbauer WS) and X-ray diffraction (XRD) were used to determine the iron species, scanning electron microscopy (SEM) to locate iron biominerals among plant tissue structures, and energy-dispersive X-ray microanalysis (EDAX), X-ray fluorescence (TXRF) and inductively coupled plasma emission spectroscopy (ICP-MS) to confirm their elemental composition. The MS spectral analysis indicated that iron accumulated in this plant mainly as jarosite and ferritin. The presence of jarosite was confirmed by XRD and the distribution of both minerals in structures of different tissues was ascertained by SEM-EDAX analysis. The convergent results obtained by complementary techniques suggest a complex iron management system in l. cylindrica, probably as a consequence of the environmental conditions of its habitat.
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