the antimicrobial properties of H. fasciculare, the real nature of the
produced antimicrobial agent is still unknown. The production of
antifungal secondary metabolites has been reported in H. fasciculare
(Aqueveque et al. 2006; Hynes et al. 2007), but no evidences
were found for the involvement of toxic secondary metabolites in
antibacterial activity (de Boer et al. 2010). In contrast, the acidic
conditions created by the fungus were suggested to be implicated
in the antibacterial activity. In spite of the well-known antimicrobial
activity against filamentous fungi and the recently reported
antibacterial activity of H. fasciculare (de Boer et al. 2010), its antiyeast
activity was never reported before.
In the proposed bioassay the model yeast Saccharomyces cerevisiae
was selected to be used as the sensitive microbial indicator
and two other yeast strains were tested to validate the developed
assay: Kluyveromyces marxianus and Candida tropicalis.