Silicon in Plants
With only a few exceptions, soils contain high amounts of Si, however, only
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1 Introduction With only a few exceptions, soils contain high amounts of Si, however, only a small part is available for uptake into plants. The concentration of soluble Si in the soil depends on the pH in the rhizosphere and is in the range of 0.1– 0.6 mM (Epstein 1994, 1999). Higher plants differ in their ability to take up and accumulate Si on a dry wt. basis (ranging from 0.1–15%). Depending on their Si content, they can roughly be divided into: – Si accumulators – members of the Cyperaceae and wetland Gramineae (10–15% Si on a dry wt. basis), dryland grasses, most of the other cereals and some members of the dicots (1–3% Si on a dry wt. basis). – Si nonaccumulators – many of the dicots (
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