Journal of Chemical Ecology

, Volume 31, Issue 2, pp 357–375

Inheritance Of Resistance to Mammalian Herbivores and of Plant Defensive Chemistry in an Eucalyptus Species

  • Julianne M. O’REILLY-WAPSTRA
  • Brad M. Potts
  • Clare Mcarthur
  • Noel W. Davies
  • Paul Tilyard
Article

DOI: 10.1007/s10886-005-1346-9

Cite this article as:
O’REILLY-WAPSTRA, J.M., Potts, B.M., Mcarthur, C. et al. J Chem Ecol (2005) 31: 357. doi:10.1007/s10886-005-1346-9

Abstract

Hybridization 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 3-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 among 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 among 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.

Keywords

Trichosurus vulpecula hybrid plant secondary metabolites generalist herbivore additive inheritance Eucalyptus globulus hybridization 

Copyright information

© Springer Science + Business Media, Inc. 2005

Authors and Affiliations

  • Julianne M. O’REILLY-WAPSTRA
    • 1
    • 5
  • Brad M. Potts
    • 2
  • Clare Mcarthur
    • 1
    • 4
  • Noel W. Davies
    • 3
  • Paul Tilyard
    • 2
  1. 1.School of Zoology, CRC for Sustainable Production ForestryUniversity of, TasmaniaHobartAustralia
  2. 2.School of Plant Science, CRC for Sustainable Production ForestryUniversity of TasmaniaHobartTasmaniaAustralia
  3. 3.Central Science LaboratoryUniversity of TasmaniaHobartTasmaniaAustralia
  4. 4.School of Plant Science, CRC for Sustainable Production ForestryUniversity of TasmaniaHobartTasmaniaAustralia
  5. 5.School of Biological SciencesThe University of Sydney New South WalesAustralia

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