Studies from National University Add New Findings in the Area of Forestry
2012 MAY 10 - (VerticalNews.com) -- According to the authors of a study from La Plata, Argentina, "Schinopsis haenkeana is a native tree to the Chaco Serrano Forests in Argentina. The white-rot fungus Phellinus chaquensis degrades its wood, causing a white-rot type of decay."
"The objective of this study was to investigate the structural alterations caused by P. chaquensis in S. hankeana decayed naturally and in vitro. Sound living branches with decay and basidiocarps of P. chaquensis were sampled from the field and in vitro decay tests were performed according to the ASTM D-2017-81 standard method. Naturally decayed branches exhibited an innermost discolored zone with white-rot decay and an outer yellowish-white portion of sound sapwood. Using LM and SEM, degraded tissue displayed diagnostic characters of selective delignification and simultaneous decay. Findings indicate that P. chaquensis causes a mottled pattern of decay (selective delignification plus simultaneous decay) in S. haenkeana wood. Other features such as accumulation of extractives, profuse deposition of crystals and tyloses, typical of Schinopsis spp. heartwood, were additionally observed. In laboratory degraded material, signs of selective delignification and incipient stages of simultaneous decay were noticeable only microscopically. Chemical analysis revealed an oxidative alteration of aromatic moieties in naturally decayed samples which might be related to the accumulation of phenols as a response to fungal attack when compared to sound samples," wrote M.L. Luna and colleagues, National University.
The researchers concluded: "Naturally degraded sapwood exhibits anatomical and chemical modifications that indicate the development of discolored wood derived from the host-pathogen interaction."
Luna and colleagues published their study in IAWA Journal (Characterization Of Schinopsis Haenkeana Wood Decayed By Phellinus Chaquensis (basidioiviycota, Hymenochaetales). IAWA Journal, 2012;33(1):91-104).
For more information, contact M.L. Luna, UNLP, Fac Ciencias Agr & Forestales, Catedra Microbiol Agr, RA-1900 La Plata, Argentina.
Publisher contact information for the IAWA Journal is: Int Assoc Wood Anatomists, Rijksherbarium, PO Box 9514, 2300 Leiden, Netherlands.
Keywords: City:La Plata, Country:Argentina, Region:South America, Forestry
This article was prepared by VerticalNews Agriculture editors from staff and other reports. Copyright 2012, VerticalNews Agriculture via VerticalNews.com.