Properties of reaction zones associated with decay from pruning wounds in plantation‐grown Eucalyptus nitens |
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| Authors: | K. M. Barry R. B. Pearce C. M. Mohammed |
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| Affiliation: | 1. CRC for Sustainable Production Forestry, GPO Box 252–12, Hobart, Tasmania, Australia 7001;2. E‐mail: Karen.Barry@ffp.csiro.au;3. School of Agricultural Science, University of Tasmania, GPO Box 252–54, Hobart, Tasmania, Australia 7001;4. School of Biosciences, University of Birmingham, B15 2TT, UK;5. Deceased 27 April 1999;6. CSIRO Forestry and Forest Products, GPO Box 252–12, Hobart, Tasmania, Australia, 7001 |
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| Abstract: | Summary Decay columns resulting from naturally infected pruning wounds in 5‐ to 8‐year‐old plantation‐grown Eucalyptus nitens in Tasmania are interfaced by a reaction zone in the sapwood. The reaction zone is blue‐purple in colour and occasionally associated with a white zone at the reaction zone/healthy sapwood interface. A log incubation experiment has shown that the reaction zone is particularly durable against decay. The reaction zone is significantly drier than healthy sapwood, with lower levels of potassium, and a lower pH than both sapwood and heartwood. The increased total phenols levels and abundant tyloses in the reaction zone may be particularly important in defence. |
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