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Evaluation of aluminium mobilization from its soil mineral pools by simultaneous effect of Aspergillus strains' acidic and chelating exometabolites
Journal of Inorganic Biochemistry ( IF 3.9 ) Pub Date : 2017-09-13 , DOI: 10.1016/j.jinorgbio.2017.09.006
Filip Polák , Martin Urík , Marek Bujdoš , Peter Uhlík , Peter Matúš

This contribution investigates aluminium mobilization from main aluminium pools in soils, phyllosilicates and oxyhydroxides, by acidic and chelating exometabolites of common soil fungi Aspergillus niger and A. clavatus. Their exometabolites' acidity as well as their ability to extract aluminium from solid mineral phases differed significantly during incubation. While both strains are able to mobilize aluminium from boehmite and aluminium oxide mixture to some extent, A. clavatus struggles to mobilize any aluminium from gibbsite. Furthermore, passive and active fungal uptake of aluminium enhances its mobilization from boehmite, especially in later growth phase, with strong linear correlation between aluminium bioaccumulated fraction and increasing culture medium pH. We also provide data on concentrations of oxalate, citrate and gluconate which are synthesized by A. niger and contribute to aluminium mobilization. Compared to boehmite-free treatment, fungus reduces oxalate production significantly in boehmite presence to restrict aluminium extraction efficiency. However, in presence of high phyllosilicates' dosages, aluminium is released to an extent that acetate and citrate is overproduced by fungus. Our results also highlight fungal capability to significantly enhance iron and silicon mobility as these elements are extracted from mineral lattice of phyllosilicates by fungal exometabolites alongside aluminium.



中文翻译:

曲霉菌株酸性和螯合代谢产物同时作用对土壤矿质铝迁移的影响

这种动员贡献调查铝从土壤中,层状硅酸盐和羟基氧化物,主要铝池以共同土壤真菌的酸性和螯合exometabolites黑曲霉棒曲霉。在培养过程中,它们的代谢物的酸度以及从固体矿物质相中提取铝的能力均存在显着差异。虽然这两种菌株能够调动从勃姆石和铝氧化物混合物的铝在一定程度上,棒曲霉努力从菱铁矿中调动任何铝。此外,铝的被动和主动真菌吸收增强了勃姆石的动员能力,特别是在后期生长期,铝生物积累级分与培养基pH值升高之间具有很强的线性相关性。我们还提供了由黑曲霉合成的草酸盐,柠檬酸盐和葡萄糖酸盐的浓度数据并促进了铝的动员。与不含勃姆石的处理相比,真菌在存在勃姆石的情况下可显着降低草酸盐的产生,从而限制了铝的提取效率。但是,在高页硅酸盐剂量的情况下,铝释放的程度使得真菌会过量生产乙酸盐和柠檬酸盐。我们的结果还突出显示了真菌显着增强铁和硅迁移率的能力,因为这些元素是通过真菌外生代谢物与铝一起从页硅酸盐的矿物晶格中提取的。

更新日期:2017-09-13
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