title: Comparison of antifungal and antioxidant activities of Acacia mangium and A. auriculiformis heartwood extracts.
abstract: The effect of heartwood extracts from Acacia mangium (heartrot-susceptible) and A. auriculiformis (heartrot-resistant) was examined on the growth of wood rotting fungi with in vitro assays. A. auriculiformis heartwood extracts had higher antifungal activity than A. mangium. The compounds 3,4',7,8-tetrahydroxyflavanone and teracacidin (the most abundant flavonoids in both species) showed antifungal activity. A. auriculiformis contained higher levels of these flavonoids (3.5- and 43-fold higher, respectively) than A. mangium. This suggests that higher levels of these compounds may contribute to heartrot resistance. Furthermore, both flavonoids had strong 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity and laccase inhibition. This suggests that the antifungal mechanism of these compounds may involve inhibition of fungal growth by quenching of free radicals produced by the extracellular fungal enzyme laccase.
authors.affiliation: Faculty of Bioresources, Department of Environment Science and Engineering, Mie University, 1515 Kamihama, Tsu 514-8507, Japan.
authors.forename: Rie
authors.initials: R
authors.lastname: Mihara
authors.forename: Karen M
authors.initials: KM
authors.lastname: Barry
authors.forename: Caroline L
authors.initials: CL
authors.lastname: Mohammed
authors.forename: Tohru
authors.initials: T
authors.lastname: Mitsunaga
mesh_terms: D000045:Acacia / Q000737:chemistry*; D000935:Antifungal Agents / Q000737:chemistry / Q000494:pharmacology*; D000975:Antioxidants / Q000737:chemistry / Q000494:pharmacology*; D005419:Flavonoids / Q000737:chemistry / Q000494:pharmacology; D016166:Free Radical Scavengers / Q000494:pharmacology; D042845:Laccase / Q000037:antagonists & inhibitors; D019686:Lamiaceae / Q000737:chemistry; D015227:Lipid Peroxidation / Q000187:drug effects*; D010936:Plant Extracts / Q000737:chemistry / Q000494:pharmacology*; D013997:Time Factors
chemical_list: D000935:Antifungal Agents; D000975:Antioxidants; D005419:Flavonoids; D016166:Free Radical Scavengers; D010936:Plant Extracts; D042845:Laccase