Ref ID: 10918
Ref Type: Journal (Unpublished)
Authors: O'Reilly-Wapstra, J. M., Potts, B. M., McArthur, C., Davies, N. W., and Tilyard, P. A.
Pub Date: 2004
Journal Name: Journal of Chemical Ecology
Volume:
Issue:
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ISBN/ISSN:
Keywords: browsing/browsing damage/chemical/chemistry/concentration/cross/damage/dominance/environment/Eucalyptus/Eucalyptus globulus/expression/F1/feeding/field/globulus/herbivore/hybrid/hybridisation/hybrids/inheritance/intermediate/mechanism/metabolite/oil/pattern/plant/plant secondary metabolites/population/preference/progeny/race/resistance/secondary metabolite/series/species/tannin/Tasmania/test/tree/trees/trial/Trichosurus vulpecula
Abstract: Hybridisation in plants provides an opportunity to investigate the patterns of inheritance of hybrid resistance to herbivores, and of the plant mechanisms conferring this resistance such as plant secondary metabolites. We investigated how inter-race differences in resistance of Eucalyptus globulus to a generalist mammalian herbivore, Trichosurus vulpecula are inherited in their F1 hybrids. We assessed browsing damage of three year old trees in a common environment field trial on four hybrid types of known progeny. The progeny were artificial intra-race crosses and reciprocal inter-race F1 hybrids of two geographically distinct populations (races) of E. globulus; north-eastern Tasmania and south-eastern Tasmania. Populations of trees from north-eastern Tasmania are relatively susceptible to browsing by T. vulpecula while populations from south-eastern Tasmania are more resistant. We assessed the preferences of these trees in a series of paired feeding trials with captive animals to test the field trial results and also investigated the patterns of inheritance of plant secondary metabolites. Our results demonstrated that the phenotypic expression of resistance of the inter-race F1 hybrids supported the additive pattern of inheritance, as these hybrids were intermediate in resistance compared to the pure parental hybrids. The expression of plant secondary metabolites in the F1 hybrids varied between major groups of individual compounds. The most common pattern supported was dominance towards one of the parental types. Together, condensed tannins and essential oils appeared to explain the observed patterns of resistance between the four hybrid types. While both chemical groups were inherited in a dominant manner in the inter-race F1 hybrids, the direction of dominance was opposite. Their combined concentration, however, was inherited in an additive manner, consistent with the phenotypic differences in browsing
Notes: Entered by Julianne O'Reilly-Wapstra (01/06/2004)
Reprint: Not in File
Program: SPF Resource Protection
Project: C3
Deliverable: C3-1
Confidentiality: Confidential to All Partners until Published
Availability: Authors
Report: Annual Report 2005/6
Type: Article
Misc 2: Submitted