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Chemical variation in a dominant tree species: population divergence, selection and genetic stability across environments


O'Reilly-Wapstra, JM and Miller, AM and Hamilton, MG and Williams, D and Glancy, NE and Potts, BM, Chemical variation in a dominant tree species: population divergence, selection and genetic stability across environments, PLoS ONE, 8, (3) Article e58416. ISSN 1932-6203 (2013) [Refereed Article]


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Licensed under Creative Commons Attribution 2.5 Generic (CC BY 2.5)

DOI: doi:10.1371/journal.pone.0058416


Understanding among and within population genetic variation of ecologically important plant traits provides insight into the potential evolutionary processes affecting those traits. The strength and consistency of selection driving variability in traits would be affected by plasticity in differences among genotypes across environments (G x E). We investigated population divergence, selection and environmental plasticity of foliar plant secondary metabolites (PSMs) in a dominant tree species, Eucalyptus globulus. Using two common garden trials we examined variation in PSMs at multiple genetic scales; among 12 populations covering the full geographic range of the species and among up to 60 families within populations. Significant genetic variation in the expression of many PSMs resides both among and within populations of E. globulus with moderate (e.g., sideroxylonal A h2op = 0.24) to high (e.g., macrocarpal G h2E. globulus, and identifies the formylated phloroglucinol compounds (particularly sideroxylonal) and a dominant oil, 1,8-cineole, as candidates for traits whose genetic architecture has been shaped by divergent selection. Additionally, as the genetic differences in these PSMs that influence community phenotypes is stable across environments, the role of plant genotype in structuring communities is strengthened and these genotypic differences may be relatively stable under global environmental changes.

Item Details

Item Type:Refereed Article
Keywords:Eucalypt, genetic variation, plant secondary metabolites, GxE
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Terrestrial ecology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Hardwood plantations
UTAS Author:O'Reilly-Wapstra, JM (Professor Julianne O'Reilly-Wapstra)
UTAS Author:Miller, AM (Dr Alison Miller)
UTAS Author:Hamilton, MG (Dr Matthew Hamilton)
UTAS Author:Glancy, NE (Miss Naomi Glancy)
UTAS Author:Potts, BM (Professor Brad Potts)
ID Code:84283
Year Published:2013
Funding Support:Australian Research Council (DP0773686)
Web of Science® Times Cited:27
Deposited By:Plant Science
Deposited On:2013-05-01
Last Modified:2014-04-04
Downloads:394 View Download Statistics

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