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Untersuchungen über die Rolle der Kieselsäure in der Entwicklung höherer Pflanzen

Studies on the role of silicic acid in the development of higher plants

I. Analyse der Hemmung durch Germaniumsäure

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Summary

Germanium acid, a specific inhibitor of the silicic acid metabolism in diatoms, inhibits the growth of Sinapis alba, Lemna minor, Wolffia arrhiza, Nicotiana tabacum, Tradescantia spec, Zinnia elegans, and Secale cereale when applied in the same concentrations as those used in the case of diatoms (15–75 μg GeO2/ml medium). The growth of Aspergillus niger, Phycomyces blakesleanus, Escherichia coli K 12, Euglena gracilis and Pandorina morum is not influenced by these and higher concentrations of Germanium acid. By application of high concentrations of silicic acid, the growth inhibition produced by germanium acid in Lemna minor is partially reduced. Plants of Lemna minor which have been inhibited by germanium acid are essentially smaller than plants grown in a normal medium; their chlorophyll content is significantly decreased. The growth of the roots in Lemna is particularly inhibited. Isolated growing roots of Lycopersicon pimpinellifolium Mill. are inhibited by small concentrations of Ge(OH)4 (ca. 1,5×10-4 M/l). In contrast to the growth of older plants, the germination of Secale cereale and Sinapis alba is not influenced by Ge(OH)4. The effects of germanium acid are discussed in relation to the physiological role of silicic acid. The results suggest that the element silicon, in the form of silicic acid, is generally essential for the normal development of higher plants.

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  1. Botanisches Institut der Universität Marburg, Marburg, Deutschland

    D. Werner

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Werner, D. Untersuchungen über die Rolle der Kieselsäure in der Entwicklung höherer Pflanzen. Planta 76, 25–36 (1967). https://doi.org/10.1007/BF00387419

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  • DOI: https://doi.org/10.1007/BF00387419

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