Journal article
Comparison of host susceptibility to native and exotic pathogens provides evidence for pathogen imposed selection in forest trees
New Phytologist, Vol.221(4), pp.2261-2272
2019
Abstract
The extent to which spatial structuring of host resistance in wild plant populations reflects direct pathogen imposed selection is a subject of debate. To examine this issue, genetic susceptibility to an exotic and co-evolved native fungal pathogen were compared using two Australian host tree species. Damage to common host germplasm of Corymbia citriodora subsp. variegata (CCV) and Eucalyptus globulus, caused by recently introduced (Austropuccinia psidii) and native (Quambalaria pitereka and Teratosphaeria sp.) pathogens was evaluated in common-garden experiments. There was significant additive genetic variation within host species for susceptibility to both the exotic and native pathogens. However, susceptibility to A. psidii was not genetically correlated with susceptibility to either native pathogen, providing support for pathogen specific rather than general mechanisms of resistance. Population differentiation (QST) for susceptibility to the native pathogens was greater than neutral expectations (molecular FST), arguing for divergent selection. Coupled with lower native, but not exotic, pathogen susceptibility in host populations from areas climatically more prone to fungal proliferation, these findings suggest that pathogen imposed selection has directly contributed to a geographic mosaic of host resistance to native pathogens.
Details
- Title
- Comparison of host susceptibility to native and exotic pathogens provides evidence for pathogen imposed selection in forest trees
- Authors
- Jules S Freeman (Corresponding Author) - University of TasmaniaMatthew G Hamilton (Author) - University of TasmaniaDavid J Lee (Author) - University of the Sunshine Coast, Queensland, Forest Industries Research CentreGeoff S Pegg (Author) - Department of Agriculture, Fisheries and Forestry (Australia, Queensland)Jeremy T Brawner (Author) - University of the Sunshine Coast, Queensland, Forest Industries Research CentrePaul A Tilyard (Author) - University of TasmaniaBrad M Potts (Author) - University of Tasmania
- Publication details
- New Phytologist, Vol.221(4), pp.2261-2272
- Publisher
- Wiley-Blackwell Publishing Ltd.
- Date published
- 2019
- DOI
- 10.1111/nph.15557
- ISSN
- 0028-646X
- Copyright note
- Copyright © 2019 Wiley-Blackwell Publishing Ltd. This is the accepted version of the following article: Freeman, J. S., Hamilton, M. G., Lee, D. J., Pegg, G. S., Brawner, J. T., Tilyard, P. A. and Potts, B. M. (2019), Comparison of host susceptibilities to native and exotic pathogens provides evidence for pathogen-imposed selection in forest trees. New Phytol, 221: 2261-2272. doi:10.1111/nph.15557, which has been published in final form at http://dx.doi.org/10.1111/nph.15557
- Organisation Unit
- Tropical Forests and People Research Centre; University of the Sunshine Coast, Queensland; Forest Industries Research Centre; Forest Research Institute
- Language
- English
- Record Identifier
- 99450729902621
- Output Type
- Journal article
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