Interactions between iron availability, aluminium toxicity and fungal siderophores |
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Authors: | Paul Illmer Rudolf Buttinger |
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Institution: | (1) Institute of Microbiology, University of Innsbruck, Technikerstr. 25, A-6020 Innsbruck, Austria |
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Abstract: | The influence of iron, aluminium and of the combined application of both metals on microbial biomass and production of siderophores
by three fungi (Aspergillus nidulans, Neurospora crassa and Hymenoscyphus ericae) were investigated. All three species showed a strong iron regulation and Al-sensitivity of siderophore biosynthesis although
several differences remained species dependent. Inhibitory effects of Fe and Al on siderophore-production were additive and
the higher binding capacity of siderophores towards iron could be compensated by a higher Al-availability. Although pH itself
is also important for regulation of siderophore biosynthesis, an indirect effect of Al on siderophore production via an Al-induced
pH decrease could be outlined. The toxic effects of Al resulting in a reduced biomass production were compensated by high
Fe-availability, whereas the addition of DFAM, a bacterial siderophore, enhanced Al-toxicity. |
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Keywords: | aluminium toxicity siderophore iron availability Neurospora Aspergillus Hymenoscyphus |
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