イネ中の不思議なケイ酸の化学(セミナー「生体の温度・水分センサーの機能と構造」)

概要

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In order to elucidate the concentration and deposition of silicic acid in rice plant, its concentration and chemical form in xylem sap at the different four growth periods were examined by spectrophotometry. In addition, some major elements included in the soil solution around the root of rice plant and the xylem sap were determined by ion chromatography. Silicic acid was quite concentrated by the uptake of soil solution from soilsphere to xylem through the root and the silicic acid concentration was ten time higher than the solubility of amorphous silica at ordinary temperature. Surprisingly, the silicic acid did not polymerize to form polysilicic acid in the xylem but was present as monosilicic acid. Whereas the concentration of other elements were not so high, some showed the similar concentration to those in the soil solution, indicating that silicic acid is specifically concentrated by root but the polymerization in the xylem is retarded by a unknown factor. According to the observation of silica deposited on the cell wall of epidermal cells of leaves of rice plant by SEM-EDX, the shape of silica particles and their distribution were geometrically regular, suggesting that the deposition of silica in rice plant may be controlled accurately by the template reactions.
低温生物工学会の論文
2007-08-21