Journal
FOREST PATHOLOGY
Volume 42, Issue 2, Pages 100-108Publisher
WILEY
DOI: 10.1111/j.1439-0329.2011.00726.x
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Funding
- UBC Forest Sciences
- Canadian Forest Service - Pacific Forestry Centre
- BC Ministry of Forests and Range
- Forest Investment Account - Forest Science Programme
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A parallel investigation to characterize host reactions involved in wound repair following abiotic injury and challenge with Armillaria ostoyae in three conifer species (Douglas-fir, western hemlock and western redcedar) was conducted in the southern Interior of British Columbia. In this study, we characterize wound healing in roots following freezing injuries to the bark. Five weeks following wounding, all conifers developed lignified impervious tissue (IT) around killed tissue, and a necrophylactic periderm (NP) formed internally abutting IT, although IT was difficult to discern in western redcedar. Phellogen restoration in the secondary phloem of some western hemlock roots was retarded around large clusters of sclereids. Displacement of phloem fibre cells occurred in western redcedar but did not appear to delay NP formation. In roots exhibiting expansion of necrosis to the vascular cambium, callus tissue was evident at the margin of the wound. Novel host reactions in western redcedar involving induced rhytidome formation and the formation of traumatic phloem resin ducts are described.
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