Forest Investment Account

Abstract of FII Project R04-013

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Maximizing Natural Durability of Western Redcedar: Beyond Thujaplicins

Author(s): Daniels, Bob (Forintek Canada Corp.)
Subject: Biometrics, Forestry, Wood Science
Series: Forest Investment Account (FIA) - Forest Science Program


Our overall objective of developing an HPLC-based system for predicting the stain- and decay-resistance of standing western red-cedar focuses on filling a key data gap in decision making around sustainable forest health and stand management, the selection of planting stock, and marketing of western red-cedar timber products. The critical-path objective of the proposed research is to determine which heartwood extractives, besides the thujaplicins, effectively inhibit the growth of stain and/or decay fungi. Previous work has shown that the decay resistance of western red-cedar does not correlate with thujaplicin content. The proposed research encompasses: (1) development of a novel and innovative microbioassay for assessing the extractives responsible for fungal decay resistance of western red-cedar heartwood, (2) preparing extracts from both fresh and previously examined heartwood material (assayed using our existing chromatographic method), (3) testing of said extracts for biological activity, and (4) bioassay-guided isolation of all antifungal compounds detected in the extracts.

For further information, please contact Bob Daniels, Forintek Canada Corp. (

Updated September 08, 2005 

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