Antifungal activity of raw extracts and purified compounds from lorantaceae against plant pathogens

SOBERÓN J.R.; SGARIGILA, M.A.; SAMPIETRO, D.A.; VATTUONE, M.A.

Tafí del Valle - Tucumán

Congreso; XXVII Annual Scientific Meeting of Tucuman Biology Society; 2010

Phytopathogenic fungi cause diseases that diminish harvest yields around the world, causing economic losses or health damages (through mycotoxins contamination). Tripodanthus acutifolius (Ruiz&Pav) Tiegh and Ligaria cuneifolia (Ruiz&Pav) Tiegh contain phenols with known antibacterial activities, though there are no data of antifungal effects. The antifungal activities of L.cuneifolia methanolic extract from aerial parts (MeOHL), the methanolic extract (MeOHT) and tripodantoside (main constituent) from T.acutifolius infusion were assayed against phytopathogenic fungi. Fusarium strains (from Graminearum and Gibberella Fujikuroi complexes) and other genera strains were tested. These strains are very resistant to commercial antifungals. Inhibition of hyphal radial growth was evaluated employing sterile disks loaded with 1 and 5 mg of samples. Ketoconazole was used as reference drug.  MeOHL and Tripodantoside showed antifungal activities against F. graminearum (24) and F. thapsinum (18), though other strains (F. verticillioides (4), F. proliferatum (20) and  Macrophomina phaseolina) were not inhibited. The results support deep studies on samples as antifungal compounds-sources.