Evaluation of antibacterial activity of Aspergillus and Penicillium spp

Bacteria have known as one of the main important limitation factors of many agricultural products. The purpose of the present study was to evaluate the antibacterial activities of different species of Penicillium and Aspergillus on some important bacteria. For this intention 12 and 21 species of Aspergillus and Penicillium, were applied, respectively. Gram-negative bacteria conducted in this research were Pseudomonas viridiflava, Xanthomonas campestrispv. Campestris and Escherichia coli and the only gram-positive bacterium was Rhatayibacter iranicus. Fungal and bacterial isolates were dual cultured simultaneously on Potato Dextrose Broth (PDB) and were shaked with 120 rpm. The samples were investigated after a week. The results of this study demonstrated that none of fungal species could inhibit E. coli and the most of the studied species couldn’t suppress the growth of P. viridiflava except isolates of (5033, 5037, and 5071) from P. crysogenum. On the other hand, A. awamori, A. ferreus, A. ostiatus, A. niger, A. foetidus, P. mali, P. crustaseum and P. citrinumcould lead to inhibition of X. campestris pv. campestris Gram positive bacterium, Rhatayibacter iranicus, was not able to grow in the presence of all species of Aspergillus. On the contrary, species of P. piscarium, P. corylophilum, P. griseofulvum and P.chrysogenum couldn’t prevent its growth.