Patterns of Decay Caused by Pycnoporus Sanguineus and Ganoderma Lucidum (Aphyllophorales) in Poplar Wood

Abstract

Populus deltoides clones are widely planted in Argentina, in a region called “Paraná River Delta”. In this site, Pycnoporus sanguineus and Ganoderma lucidum (Aphyllophorales) cause white-rot decay in both living and felled poplar trees. The purpose of this work was to estimate, through laboratory decay tests, the ability of both fungi to degrade poplar wood and to describe the patterns of decay using light and scanning electron microscopy. Two exposure times were analyzed: 75 and 150 days. The percent weight loss produced by both fungal strains was similar for both exposure periods (c. 50–60% of wood mass) but microscopic observations showed there were different patterns of decay. Samples inoculated with P. sanguineus showed a selective delignification, whereas those inoculated with G. lucidum exhibited a combination of simultaneous decay and selective delignification. Separation among cells was the main diagnostic feature for selective decay. By contrast, the presence of erosion troughs, cell wall thinning, bore holes, rounded pit erosion and erosion channels were diagnostic for the simultaneous type of decay.

Assessment of wood degradation by Pycnoporus sanguineus when co-cultured with selected fungi

“…Since contradicting results regarding the wood degradation pattern of P. sanguineus on different wood species exists in literature (Ferraz et al 1998;Luna et al 2004), this phenomenon needs to be further investigated.…”

“…The latter is important for the paper and pulp industry, as the residual cellulose fibers are the main component for paper. Not surprisingly, many researchers have embarked upon studying the so-called biopulping process (Akhtar et al, 1993;Luna et al, 2004). The main drive behind this research was to reduce costs of chemicals needed and the resulting pollution during the pulping process (Guitiérrez et al, 1999).…”

“…The majority of these investigations however, focused on the degradation of wood from a single tree species by pure cultures of white-rot fungi (Luna et al, 2004) and very few studied the effect of co-cultures on wood degradation. The latter scenario would be closer to the situation in nature, where consortia of microbes are known to degrade lignocellulosic material (Watanabe et al, 2003).…”

Structural Evaluation of a Timber Construction Element Originating from the Great Metéoron Monastery in Greece

“…10). This type of degradation is common for white-rot decay (Wilcox 1968;Highley and Murmanis 1987;Schwarze 1995;Anagnost 1998;Luna et al 2004). …”

Avaliação do potencial de degradação de fungos causadores de podridão branca

“…As pesquisas relacionadas à utilização de fungos causadores de podridão branca têm aumentado a atenção nos últi-mos anos devido ao reconhecimento da sua importância em diferentes áreas da ciência como, por exemplo, na biodegradação de compostos xenobióticos (Rabinovich et al, 2004;Tortella et al 2005;Patel et al, 2009) e decomposição de resí-duos madeireiros (Yadav et al, 2002;Luna et al, 2004;Fernandes et al, 2005;Alfenas et al, 2007;Van Heerden et al, 2008).…”