The molecular basis of quantitative variation in foliar secondary metabolites in Eucalyptus globulus
Article first published online: 24 MAY 2011
© 2011 The Authors. New Phytologist © 2011 New Phytologist Trust
Volume 191, Issue 4, pages 1041–1053, September 2011
How to Cite
Külheim, C., Yeoh, S. H., Wallis, I. R., Laffan, S., Moran, G. F. and Foley, W. J. (2011), The molecular basis of quantitative variation in foliar secondary metabolites in Eucalyptus globulus. New Phytologist, 191: 1041–1053. doi: 10.1111/j.1469-8137.2011.03769.x
- Issue published online: 11 AUG 2011
- Article first published online: 24 MAY 2011
- Received: 7 February 2011, Accepted: 13 April 2011
- genetic association;
- plant secondary metabolites;
- plant–herbivore interaction;
- •Eucalyptus is characterized by high foliar concentrations of plant secondary metabolites with marked qualitative and quantitative variation within a single species. Secondary metabolites in eucalypts are important mediators of a diverse community of herbivores.
- •We used a candidate gene approach to investigate genetic associations between 195 single nucleotide polymorphisms (SNPs) from 24 candidate genes and 33 traits related to secondary metabolites in the Tasmanian Blue Gum (Eucalyptus globulus).
- •We discovered 37 significant associations (false discovery rate (FDR) Q < 0.05) across 11 candidate genes and 19 traits. The effects of SNPs on phenotypic variation were within the expected range (0.018 < r2 < 0.061) for forest trees. Whereas most marker effects were nonadditive, two alleles from two consecutive genes in the methylerythritol phosphate pathway (MEP) showed additive effects.
- •This study successfully links allelic variants to ecologically important phenotypes which can have a large impact on the entire community. It is one of very few studies to identify the genetic variants of a foundation tree that influences ecosystem function.