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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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Eyles, A and Davies, NW and Mohammed, CL (2004) Traumatic oil glands induced by pruning in the wound-associated phloem of Eucalyptus globulus: chemistry and histology. Trees: structure and function, 18 (2). pp. 204-210. ISSN 0931-1890

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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
Journal or Publication Title: Trees: structure and function
Page Range: pp. 204-210
ISSN: 0931-1890
Identification Number - DOI: 10.1007/s00468-003-0297-4
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Date Deposited: 11 May 2008 23:58
Last Modified: 18 Nov 2014 03:39
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