Comparison of Antifungal and Antioxidant Activities of <Emphasis Type="Italic">Acacia mangium</Emphasis> and <Emphasis Type="Italic">A. auriculiformis</Emphasis> Heartwood Extracts |
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Authors: | Rie?Mihara Karen?M?Barry Caroline?L?Mohammed Email author" target="_blank">Tohru?MitsunagaEmail author |
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Affiliation: | (1) Faculty of Bioresources, Department of Environment Science and Engineering, Mie University, 1515 Kamihama, Tsu 514-8507, Japan;(2) CRC for Sustainable Production Forestry, Private Bag 12, Hobart, Tasmania, Australia, 7001;(3) School of Agricultural Science, University of Tasmania, Private Bag 12, Hobart, Tasmania, Australia, 7001;(4) CSIRO Forestry and Forest Products, Private Bag 12, Hobart, Tasmania, Australia, 7001 |
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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. |
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Keywords: | Acacia mangium A auriculiformis heartrot heartwood extracts flavanone Phellinus noxius P badius antifungal activity antioxidant laccase inhibition |
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