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.

Determinação do conteúdo fenólico e avaliação da atividade antioxidante de Acacia podalyriifolia A. Cunn. ex G. Don, Leguminosae-mimosoideae

“…As substâncias com núcleo fenólico apresentam destaque especial como efi cientes captadores radicalares, como demonstrado por Gyamfi et al (1999), Kujala et al (2000), Chang et al (2001), Sallem et al (2001), Thalang et al (2001, Al-Mamary et al (2002);Mihara et al (2005);Meda et al (2005);Wu et al (2005).…”

“…Mel obtido de A. ehrenbergina (Al-Mamary et al, 2002) e de outras espécies de Acacia (Meda et al, 2005), apresentou elevado potencial antioxidante e teor de compostos fenólicos. Extratos e compostos fl avonoídicos obtidos de A. mangium e A. auriculiformis também demonstraram intensa atividade captadora de radicais livres (Mihara et al, 2005).…”

Effects of different nitrogen rich substrates and their combination to the yield performance of oyster mushroom (Pleurotus ostreatus)

“…While many previous studies have reported the antifungal and anti microbial activities of polyphenols of Acacia spp. bark, the precise mechanisms are not clear (Mahesh and Satish 2008;Mihara et al 2005;Mutai et al 2009). Therefore, the present study has been designed to assess the effects of various biological nitrogen supplements of several lignocellulosic materials and their combinations on the different phases of cultivation and yield of the oyster mushroom, Pleurotus ostreatus, to find the best substrate condition for efficiently increasing mushroom productivity.…”

Anti Fungal Activity of Wood Extract of Aquilaria crassna Pierre ex Lecomte Against Agarwood-Inducing Fungi, Fusarium solani

“…Eusiderin is an example of lignan isolated from ulin (Eusideroxylon zwagery) wood (Syafii et al, 1987). Phenolic extractives of acacia induced resistance of the tree against heart wilt disease caused by fungi (Mihara et al, 2005). Scopoletin, is anti fungal compound of Hevea brasiliensis, that inhibits the spreading of Microcyclus ulei infection to other wood tissue (Jayasuriya et al, 2003).…”

“…Many anti fungal and anti microbial compounds were produced from plant extractives. Mechanism of extractives in inhibiting fungal growth is assumed as the result of chemicals in interfering/stalling fungal enzyme activity to decompose carbohydrate into the simplest absorbable matter for fungi digestion and metabolism (Syafii et al 1987;Jayasuriya et al, 2003;Mihara et al, 2005). As for A.crassna case here, some bioactive compounds within ethyl acetate-soluble fraction should affect F. solani fungi by inhibiting their mycelial growth.…”