1984/01/01 by Robert A. Blanchette · 2 citations
Agricultural and Biological Sciences · Chemistry · #Enzyme-mediated dye degradation #Forest Ecology and Biodiversity Studies #Wood and Agarwood Research
paper · doi:10.1094/phyto-74-725
Black regions and flecks in wood decayed by several white rot fungi ( Cerrena unicolor , Dichomitus squalens , Ganoderma applanatum , G. tsugae , Heterobasidion annosum , * 2Ischnoderma resinosum*1, and Perenniporia medulla-panis ) contained large concentrations of manganese. Two types of decay patterns occurred in wood degraded by these fungi: a selective delignification resulting in the removal of lignin and hemicellulose and a typical white rot causing simultaneous removal of all cell wall components. Atomic emission spectrometry and X-ray microanalyses detected manganese and determined its spatial relationship within selectively delignified wood. Black regions in eastern hemlock wood decayed by G. tsugae showed over a 100-fold increase of manganese when compared with sound wood. When black regions were compared with surrounding delignified wood and adjacent white-rotted wood, the increases of manganese were 24-fold and 51-fold, respectively. In contrast to the other decays examined, manganese deposits were found in white-rotted wood attacked by Fomes fomentarius . Micromorphological characteristics of decayed wood and manganese deposits were observed with scanning electron microscopy. Leucoberbelin blue reagent confirmed the presence of manganese oxides within the black regions.