Stirling, R., Kus, S., Uzunovic, A. 2016. Inhibition of
basidiospore germination by western redcedar heartwood extractives.
International Biodeterioration & Biodegradation 114: 145-149
Abstract
Understanding the relationship between extractives and decay
resistance in western red cedar (WRC) is essential for breeding durable
planting stock. To date, most such work has focused on resistance to mycelial
attack. However, this is potentially misleading since WRC is largely used in
above-ground applications where basidiospore germination is the primary way in
which the wood is initially colonized. Efficacy against basidiospores is likely
a critical factor affecting wood’s decay resistance in above-ground
applications. In this study the effect of selected extractives on basidiospore
germination was evaluated. Partially-extracted WRC veneer samples, and spruce
samples treated with beta-thujaplicin, thujic acid, or plicatic acid were used.
Beta-thujaplicin and thujic acid were associated with significantly reduced
rates of Gloeophyllum sepiarium, Fomitopsis palustris, and Dichomitus
squalens basidiospore germination. Plicatic acid was not associated with
any effect on basidiospore germination. Planting stock that generates heartwood
with high concentrations of thujaplicins and thujic acid should be selected to
yield wood that will be resistant to basidiospore germination.
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