Growth substrates control the ability of Fusarium oxysporum to solubilize low-rank coal |
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Authors: | U Hölker R M Fakoussa M Höfer |
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Institution: | (1) Botanisches Institut der Universität Bonn, Kirschallee 1, D-53115 Bonn, Germany;(2) Institut für Mikrobiologie und Biotechnologie der Universität Bonn, Meckenheimer Allee 168, D-53115 Bonn, Germany |
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Abstract: | The ability of the fungus Fusarium oxysporum to solubilize lignite was found to depend on the presence of a specific carbon source. When grown on glucose or another carbohydrate, the fungus is unable to solubilize coal but it produces the red dye bikaverin. In the coal-solubilizing state, which can be induced by cultivation in the presence of glutamate or gluconate, the fungus does not produce bikaverin. The presence or absence of the pigment can therefore be taken as an indicator of the ability of the fungus to solubilize coal. Addition of extracted and purified bikaverin to F. oxysporum growing on glutamate or gluconate inhibits coal solubilization. Hence, F. oxysporum offers a suitable system for investigating the mechanism of microbial coal degradation by comparing the two growth-substrate-controlled physiological states. |
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