Antifungal activity of Bacillus species and Pseudomonas aeruginosa against filamentous fungi and yeasts

Several bacteria of the genera Bacillus and Pseudomonas are known to produce metabolites with antimicrobial activity. In the present work, the antifungal activity of several species of Bacillus and a Pseudomonas aeruginosa strain were studied towards filamentous fungi and yeasts, by the agar diffusion method. The test organisms were filamentous fungi, phytopathogenic, ubiquitous and wood surface contaminants. Some human opportunistic or pathogenic Candida species were also tested. Eight Bacillus species showed antifungal activity against some of the filamentous fungi. B. subtilis CCMI 355 has shown a good antifungal activity even against Candida species. P: aeruginosa inhibited the growth of some of the filamentous fungi. Most Bacillus species have. shown antifungal activity towards Trichoderma species, Trichodermalharzianum, T. koningii and T virgatum. The chloroform extract of P. aeruginosa inoculated in King A culture medium was submitted to the bioautogaphic method with Cladosporium cucumerinum, that revealed the presence of at least 2 active compounds.