The evaluate of tolerance threshold of Agaricus bisporus to different concentrations of various heavy metals

Improving soil microbial activity and using synergistic relations including Ectomycorrhizal fungi (ECM) are profitable and have economic significance for plant growth in soils with heavy metals contamination. Agaricus bisporus (J. Lange), an edible mushroom has been observed to grow under pistachio trees (Pistacia vera L.) plantations in orchards of Rafsanjan, Kerman and it forms ectomycorrhiza with the tree. In order to evaluate the fungus tolerance, the effect of different concentrations (0, 15, 30, 45, 60 mg/L) of various heavy metals Nickel (Ni), Mangenese (Mn) on fungal colony diameters and mycelial dry weights, heavy metals accumulation was studied in A. bisporus. The result showed there was a strong variation in metal tolerance, so that A. bisporus was more tolerant to Mn than other metals, so that the fungus had an increased growth in the presence of low concentrations of Mn, but Ni greatly inhibited increase in biomass and colony diameter even at concentrations as low as 15 mg/L. With the increase in the concentrations these heavy metals, the amount of metals in mycelium were increased too

کلیدواژه ها:

Agaricus bisporus ، Tolerance threshold ، Mn2+ ، Ni2+ ، MMN medium