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The research focused on the enzyme production/activity of sixteen  Aspergillus niger  strains isolated from different localities. The soils vary mainly in their pH value, which ranges from an ultra-acidic (  9.0) environment. Contamination caused by several centuries of mining activities at old mining sites persists at all the localities. The concentrations of toxic elements, such as As, Sb, Zn, Cu and Pb, very often exceed the common limit values. Presence of toxic elements in contaminated sites may affect microscopic fungi and cause changes of their physiology, including the production of different metabolites, such as enzymes. Production of esterase, cellulase, lipase and protease was investigated. Changes in physiological properties, such as the growth and enzymatic activity of the sixteen  A. niger  wild type strains, were determined. Esterase, cellulase and lipase activity was not determined in the sixteen strains tested. Considerable differences were recorded in the size of the colonies also within strains cultivated on the same nutrient medium. The control strain from locality Gabčíkovo formed the smallest colonies when tracking LA, EA and PA compared with the other strains. Lipase production was determined for several strains at different intensities and was highest in the strain isolated from the uncontaminated locality Gabčíkovo. The enzymatic activity of the other strains isolated from contaminated sites was very low. The achieved results confirmed the direct influence of environmental factors on the physiological properties of the studied strains of  Aspergillus niger .

Enzyme production by soilborne fungal strains of Aspergillus niger isolated from different localities affected by mining