Tolerance to wood preservatives by copper-tolerant wood-rot fungi native to south-central Chile.
Understanding the effect of heavy metals and wood preservatives on the growth of wood-rot fungi native to a certain region may improve reliability in determining the effectiveness of antifungal products, particularly when dealing with new formulations. In this investigation, strains of copper-tolerant wood-rot fungi native to south-central Chile were evaluated against two preservatives: commercial chromated copper arsenate type C (CCA-C) and a new formulation with boron and silicon (BS). Thirteen native strains, mainly white-rot fungi, were selected for their high growth rates in solid medium containing 3 mM of copper. A short-term test was then carried out, consisting of adding cellulose disks impregnated with different concentrations of preservatives to solid culture media inoculated with selected copper tolerant strains. There was a great variability in interspecific and intraspecific responses to the presence of copper and preservatives in culture media. Among the native and commercial strains evaluated, the white-rot fungi Trametes versicolor 38 and mainly Ganoderma australe 100 were notable for their tolerance to all the CCA-C and BS concentrations. The brown-rot fungus Wolfiporia cocos, used as reference strain, showed a high tolerance to CCA-C, but not to BS preservative. T. versicolor 38 and G. australe 100 were selected for subsequent studies on preserved wood degradation.
Guillén
Yudith
Y
Facultad de Ciencias Forestales, Programa de Doctorado en Ciencias Forestales, Universidad de Concepción, Los Angeles, Chile.
Navias
David
D
Machuca
Angela
A
D001149:Arsenates / Q000378:metabolism; D001673:Biodegradation, Environmental; D001896:Boron Compounds / Q000378:metabolism; D002677:Chile; D003300:Copper / Q000378:metabolism* / Q000633:toxicity; D004785:Environmental Pollutants / Q000378:metabolism / Q000633:toxicity; D005658:Fungi / Q000187:drug effects / Q000378:metabolism*; D017655:Silicon Compounds / Q000378:metabolism; D014934:Wood / Q000382:microbiology*
D001149:Arsenates; D001896:Boron Compounds; D004785:Environmental Pollutants; D017655:Silicon Compounds; C040890:chromated copper arsenate; D003300:Copper