Investigation on Antibacterial Activity of Some Antibacterial

Bacteria is one of limitation factors in agricultural crops. According to their adaptation to various environmental conditions, their destructive effects in harvesting and emerging resistant races to common bactericides in their populations, which apply new controlling measures, are indispensable. In this case, using secondary metabolites of fungi, like Penicillium with antibacterial effect could be promising. In this survey 6 fungal species such as Penicillium chrysogenum, P. citrinum, P. pinophilum, P. crustosum, P. cammune and P. aurantiogriseum with two genres of plant pathogenic bacteria, Rathayibacter iranicus and Pseudomonas syringae were used. In this study four antibacterial assays were used: cultivation at broth media, dual culture, antibiotic and four-point cultivation assay, and that all of the experiments were performed with three repetitions. Results of this investigation indicate that these six species of penicillium have antibacterial effect on Rathayibacter and they can be controlled it but no antibacterial effect was observed in Pseudomonas, and bacterium were able to control the fungus additionally.