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Isolation and characterization of silicate mineral-solubilizing Bacillus globisporus Q12 from the surfaces of weathered feldspar

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A silicate mineral-solubilizing bacterial strain Q12 was isolated from the surfaces of weathered feldspar and identified as Bacillus globisporus Q12 based on the 16S rDNA gene sequence analysis. Three silicate minerals (feldspar, muscovite, and biotite) were used to investigate potassium and silicon mobilization by strain Q12. In liquid cultures, the strain showed better growth on the biotite than on feldspar and muscovite. The biotite was the best potassium source for growth of the strain. Solubilization of potassium and silicon from the silicate minerals by the strain resulted mostly from the action of organic acids. Gluconic acid seemed to be the most active agent for the solubilization of the 3 silicate minerals. Gluconic and acetic acids were likely involved in the solubilization of feldspar. The strain could be acid or alkali and salt tolerant and temperature resistant.

Une souche bactérienne Q12 qui solubilise le silicate a été isolée de feldspath désagrégé et identifiée comme étant Bacillus globisporus Q12, selon une analyse de la séquence du gène de l’ADNr 16S. Trois types de silicates (feldspath, muscovite et biotite) ont été utilisés pour étudier la mobilisation du potassium et du silicium par la souche Q12. En culture liquide, la souche croissait mieux sur la biotite que sur le feldspath ou la muscovite. La biotite constituait la meilleure source de potassium pour la croissance de la souche bactérienne. La solubilisation du potassium et du silicium à partir de silicate par la souche bactérienne résultait principalement de l’action d’acides organiques. L’acide gluconique semblait le plus actif pour solubiliser les 3 types de silicates. L’acide gluconique et l’acide acétique étaient probablement impliqués dans la solubilisation du feldspath. La souche pourrait être tolérante aux acides, aux alcalis et aux sels, et être résistante à la température.

Document Type: Research Article

Publication date: December 1, 2008

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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