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Traumatic oil glands induced by pruning in the wound-associated phloem of Eucalyptus globulus: chemistry and histology
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Abstract
The natural occurrence of oil glands in various
organs such as bark and leaves is well established as a
characteristic of Eucalyptus, but this is the first reported case of traumatic oil glands induced in response to wounding. The new phloem enveloping the wound, which
had developed within the 2 years following branch
pruning in 5-year-old Eucalyptus globulus Labill., was
morphologically distinct from healthy stem phloem.
Histological examinations revealed this wound-associated
phloem to be largely composed of secretory cavities
similar in appearance to oil glands. Subsequent analysis
of the wound-associated phloem extracts by GC-MS
confirmed the presence of volatile terpenes and phenols.
The total extracted oil content determined for woundassociated phloem extracts was significantly higher (>4 times) than for healthy stem phloem extracts. A comparison of the relative abundances of ten individual terpenoids from wound-associated phloem and healthy
phloem revealed a number of significant differences in
terpene composition. Implications of the role of terpenes
as inducible secondary metabolites in tree wound responses
are discussed.
Item Type: | Article |
---|---|
Authors/Creators: | Eyles, A and Davies, NW and Mohammed, CL |
Journal or Publication Title: | Trees: structure and function |
ISSN: | 0931-1890 |
DOI / ID Number: | 10.1007/s00468-003-0297-4 |
Additional Information: | The original publication is available at www.springerlink.com |
Item Statistics: | View statistics for this item |
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