Abstract

VAILLANT FLORES, Daymara I; ROMEU CARBALLO, Carlos R; GOMEZ PERALTA, Marlene  and  RAMIREZ OCHOA, Rebeca. Fungicide activity of lichen-forming fungi Loxospora pustulata above Rhizoctonia solani. Rev. cienc. tecnol. [online]. 2014, n.21, pp.12-14. ISSN 1851-7587.

The lichens are fungi that establish a symbiotic relation with one or various photosynthetic organisms (algae or cyanobacterium). In this relation the fungi (mycobiont) produce secondary metabolites with antibiotic activity. For this reason the fungicide effect of metabolites produced in culture media by the lichen's mycobiont Loxospora pustulata, above Rhizoctonia solani isolated from potato was verified. The mycobiont was cultivated in media potato dextrose agar (PDA) and it was fermented in potato broth by shaken culture. The metabolites were extracted with ethyl acetate. A solution in PDA at 0,01: 0.03: 0,07% w/v concentrations was prepared from the lichens extracts. R. solani discs were placed in the solution and the mycelial growth inhibition percentage was measured. The lichen extract showed 100% of inhibition of the R. solani mycelial growth to all concentrations.

Keywords : Lichens; Lichens substances; Fungicide activity.

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