A comparative analysis of population structure of a forest tree, Eucalyptus globulus (Myrtaceae), using microsatellite markers and quantitative traits
By Dorothy Steane, Natalie Conod, Rebecca C. Jones, R. Vaillancourt, Brad M. Potts. Tree Genetics & Genomes, 2006
118 citations recorded by the source corpus.
Eucalyptus globulus (Myrtaceae) is a forest tree native to southeastern Australia, but is grown globally for pulpwood and timber. Eight microsatellite loci were used to determine the degree of selectively neutral differentiation between native populations of the geographic races of E. globulus that are used in a national breeding programme. Spatial differentiation was detected among 340 samples from across the species range (FST=0.09±0.02). Analysis of molecular variance showed that there was significant variation between the races, and an unweighted pair group method with arithmetic mean analysis of Nei’s genetic distance between races showed that geographically proximal races tended to be more closely related than geographically distant races. This contrasted markedly with analyses based on quantitative genetic data, where some races appeared to be highly divergent from their geographically closest neighbours. Comparison of racial differentiation based on quantitative (QST) and molecular (FST) data suggested that at least five of the quantitative traits used for defining races of E. globulus have been influenced by natural selection, resulting in cases of both phenotypic divergence of parapatric races and phenotypic convergence of allopatric races. We conclude that selectively neutral molecular markers are more useful than quantitative genetic data for identifying the evolutionary affinities and lineages within E. globulus. However, both sources of information should be used in defining evolutionarily important units for conservation. The population structure observed in E. globulus has important consequences for future association studies and may also affect breeding strategies if significant genome co-adaptation has occurred.
Subfields: Ecology, Evolution, Behavior and Systematics, Genetics, Plant Science
View Paper: https://www.semanticscholar.org/paper/6b88bddea19cdaf0c877e636b228d47b7b45e16c
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In Ecology, Evolution, Behavior and Systematics
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Citations in the corpus
- Age trends in genetic parameters for growth and wood density in Eucalyptus globulus (2010, background): “In the present case, the lower genetic correlation at the subrace level appears to be driven by a change in the rank of several subraces between age 4 and 16, with consistent responses observed for subraces from the same geographic region or genetic lineage as defined using molecular markers (Steane”
- Decline of a biome: evolution, contraction, fragmentation, extinction and invasion of the Australian mesic zone biota (2011, unknown): “There are significant levels of genetic structure within various species in Tasmania (McKinnon et al., 2004; Steane et al., 2006; Macqueen et al., 2009; Worth et al., 2009, 2010; Nevill et al., 2010), and also evidence of biotic connectivity between western Tasmania and western Victoria (e.g. Otway…”