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Title: Oxalic acid production of fifteen brown-rot fungi in copper citrate- treated southern yellow pine

Source: In:The International Research Group On Wood Preservation, Section 1, Biology; IRG/WP 01-10388

Author(s)Green, Clausen

Publication Year: 2001  View PDF »

Category: Journal Articles

Abstract: Non-arsenical copper-based wood preservatives have grown in number since the 1980's as a response to environmental concerns posed by arsenicals. Interest in copper tolerant decay fungi has increased accordingly. Oxalic acid (OA) production by brown-rot fungi has been proposed as one mechanism of copper tolerance. Fifteen brown-rot fungi representing the genera Postia, Wolfiporia, Serpula, Gloeophyllum, Laetiporus, Coniophora, Antrodia, and Tyromyces were evaluated for OA production bi-weekly in southern yellow pine (SYP) blocks treated with 1.2% AI copper citrate (CC). Ten fungi were designated copper tolerant and produced 2 to 17 times more OA in the CC-treated blocks than in untreated SYP after 2 weeks. Weight losses ranged from 20 to 55% in CC-treated SYP after 10 wks. Five fungi were copper-sensitive, producing low levels of OA and low weight losses on CC-treated blocks. In this study, early induction of OA appears to closely correlate with copper tolerance. We conclude that brown-rot fungi able to exceed and maintain an OA concentration of >400 mM in this study effectively decayed SYP treated with copper citrate.

Keywords: oxalic acid, copper tolerance, copper citrate, brown-rot fungi

File size: 45 kb(s)

Date posted: 05/20/2009
Current FPL Scientist associated with this product
Clausen, Carol A.
Supervisory Research Microbiologist
  

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