Silicon Contents in Phosphorus Fractions in Vicia faba

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Summary

This paper is concerned with attempts to elucidate whether silicon absorbed in inorganic form remains unchanged in plant or is incorporated to organic phosphorus compounds.

Aerial parts and roots of Vicia faba (var. Windsor bialy) grown in hydroponic cultures containing Si were investigated. Phosphorus compounds were fractionated according to Holden (1952). Phosphorus and silicon were determined in these fractions in parallel basing on Marczenko’s paper (1964).

A considerable increase of Si content was found in the RNA fraction. Si: P ratio increases along with increased quantities of Si introduced to the medium. When P is completely eliminated and replaced by Si, Si: P ratio is 2,2 in roots and 1.8 in aerial parts that is almost ten times higher than in the control (without Si). We stated that Si present in the RNA fraction is organically bound.

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