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Silicon in Imperata cylindrica (L.) P. Beauv: content, distribution, and ultrastructure
Lourdes Rufo1, Alejandro Franco, Vicenta de la Fuente
1Dpto. Biología, Facultad de Ciencias de la Universidad Autónoma de Madrid, Campus Cantoblanco, 28049, Madrid, Spain.
Abstract:
Silicon concentration, distribution, and ultrastructure of silicon deposits in the Poaceae Imperata cylindrica (L.) P. Beauv. have been studied. This grass, known for its medicinal uses and also for Fe hyperaccumulation and biomineralization capacities, showed a concentration of silicon of 13,705 ± 9,607 mg/kg dry weight. Silicon was found as an important constituent of cell walls of the epidermis of the whole plant. Silica deposits were found in silica bodies, endodermis, and different cells with silicon-collapsed lumen as bulliforms, cortical, and sclerenchyma cells. Transmission electron microscope observations of these deposits revealed an amorphous material of an ultrastructure similar to that previously reported in silica bodies of other Poaceae.
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