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Rajesh Kumar*, Krishan Pal, Anju Pal


The modern world is facing today a number of environmental problems – one of the major problems being that of pollution by heavy metals. Due to their mobility in natural water ecosystems as well as their toxicity to higher life forms, heavy metal ions in surface water and ground water supplies are emerging as major inorganic contaminants in the environment. This study was conducted to investigate the tolerance of some resistant fungal strains from soils contaminated with heavy metals. Various fungal strains (Aspergillus niger, Trichoderma lignorum, Fusarium moniliforme, Sepedonium chrysospermum and Botryotrichum atrogriseum) were isolated from soil samples collected from studied sites which heavy metals like (Cr and Fe) and other pollutants have been emitted in effluents for several years. The present study was undertaken with an aim to obtain from soil some fungal strains which have the potential to tolerate heavy metals. The metals taken for study in the present investigation were: (a) cadmium as cadmium chloride; (b) nickel as nickel chloride; (c) copper as copper sulphate; (d) iron as iron sulphate; and (e) lead as lead nitrate. The approach suggested by Babich and Stotzky (1982) was followed, which is based upon the isolation of tolerant organisms from natural habitats using a nutrient medium in which the pollutant (for example, the metal of interest) has been incorporated. A total of 41 fungal species were isolated from the soil samples in the present investigation. Out of these, 37 species could be identified which belong to eighteen genera. Out of these 37 species, only two species belong to Zygomycota; one unidentified species belongs to Ascomycota and the remaining 35 were anamorphic fungi (Deuteromycota). The microbial number was remarkably higher in the control soil than contaminated soil samples collected from mining areas. and had the highest concentration in the polluted soils. The minimum inhibition concentrations (MICs) of and showed the highest values against the fungal strains. and were the lowest contaminants in the polluted. The tested resistant strains showed the strongest inhibition.

Keywords: heavy metal, fungi, Pollution, tolerance.

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