Author/Authors :
Mohammadian Fazli، Mehran نويسنده 2Department of Environmental Health, Faculty of Health, Zanjan University of Medical Sciences, Zanjan, Iran , , Soleimani، Negin نويسنده Department of Environmental Health Engineering, Zanjan Universiry of Medical Sciences, Zanjan, Iran , , Mehrasbi، Mohammadreza نويسنده Department of Environmental Health Engineering, Zanjan Universiry of Medical Sciences, Zanjan, Iran , , Darabian، Sima نويسنده Medical Entomology and Mycology Department, School of Medicine, Zanjan Universiry of Medical Sciences, Zanjan, Iran , , Mohammadi، Jamshid نويسنده Medical Entomology and Mycology Department, School of Medicine, Zanjan Universiry of Medical Sciences, Zanjan, Iran , , Ramazani، Ali نويسنده ,
Abstract :
Background: Soil and effluent of lead and zinc industries contain high concentration of cadmium. The present
study was conducted to isolate tolerant fungal strains from cadmium -polluted sites in Zanjan province, Iran.
Methods: Cadmium tolerance and bioremediation capacity of seven isolates including Aspergilus versicolor,
Aspergillus fumigatus, Paecilomyces sp.9, Paecilomyces sp.G, Terichoderma sp, Microsporum sp,Cladosporium sp were
determined.
Results: Minimum inhibitory concentration values among 1,000-4,000 mg l?1proved great ability of isolated strains
to survive in cadmium polluted environments. The most tolerant fungi, Aspergilus versicolor, showed tolerance index
of 0.8 in 100 mg l?1 cadmium agar media. Fungal resistance against cadmium is depended directly on strain’s
biological function.
A. versicolor was found to bioaccumulate over7 mg of cadmium per 1 g of mycelium, followed by 5.878, 5.243, and
5.075, 4.557 by Paecilomyces sp, Aspergilus fumigatus, Microsporum sp and Terichoderma sp, respectively.
Conclusion: It can be noted that tolerance of the strains appears to be independent from bioaccumulation
capacity. Finally, the results indicated that A. versicolor could be a prospective candidate for bioremediation
processes.
