Influence of essential oils and polyhexamethyleneguanidine on black yeast-like fungi Exophiala alcalophila

Abstract

Influence of essential oils of the following plants Rosmarinum officinalis L., Pinus sibirica Du Tour, Abies sibirica Ledeb., Juniperus communis L., turpentine oil, and polyhexamethyleneguanidine (PHMG) on black yeast-like fungi Exophiala alcalophila FCKU 304 was investigated. Disc-diffusion method was used. Level of the antifungal influence on X. alcalophila found to be different for each chemical. 5% PHMG is characterized by the highest fungicide activity. Level of the antifungal activity of essential oils of plants Rosmarinum officinalis, Pinus sibirica and Abies sibirica is similar to 1.5-3 % PHMG activity. The PHMG and essential oil of Rosmarinum officinalis found to cause exchanges of morphometric indices of cells, colony morphology and intensity of budding E. alcalophila what is considered as adaptations of investigated culture of black yeast-like fungus. Furthermore dimorphic transition 'yeasts – mycelium' of E. alcalophila was observed under influence of essential oil of Rosmarinum officinalis.

Keywords

• Exophiala alcalophila, essential oils, polyhexamethyleneguanidine, antifungal influence