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Multiple evolutionary processes drive the patterns of genetic differentiation in a forest tree species complex

Citation

Jones, RC and Steane, DA and Lavery, M and Vaillancourt, RE and Potts, BM, Multiple evolutionary processes drive the patterns of genetic differentiation in a forest tree species complex, Ecology and Evolution, 3, (1) pp. 1-17. ISSN 2045-7758 (2013) [Refereed Article]


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Copyright 2012 The Authors

DOI: doi:10.1002/ece3.421

Abstract

Forest trees frequently form species complexes, complicating taxonomic classification and gene pool management. This is certainly the case in Eucalyptus, and well exemplified by the Eucalyptus globulus complex. This ecologically and economically significant complex comprises four taxa (sspp. bicostata, globulus, maidenii, pseudoglobulus) that are geographically and morphologically distinct, but linked by extensive "intergrade" populations. To resolve their genetic affinities, nine microsatellites were used to genotype 1200 trees from throughout the natural range of the complex in Australia, representing 33 morphological core and intergrade populations. There was significant spatial genetic structure (FST = 0.10), but variation was continuous. High genetic diversity in southern ssp. maidenii indicates that this region is the center of origin. Genetic diversity decreases and population differentiation increases with distance from this area, suggesting that drift is a major evolutionary process. Many of the intergrade populations, along with other populations morphologically classified as ssp. pseudoglobulus or ssp. globulus, belong to a "cryptic genetic entity" that is genetically and geographically intermediate between core ssp. bicostata, ssp. maidenii, and ssp. globulus. Geography, rather than morphology, therefore, is the best predictor of overall genetic affinities within the complex and should be used to classify germplasm into management units for conservation and breeding purposes.

Item Details

Item Type:Refereed Article
Keywords:blue gum, clinal variation, conservation genetics, evolution, gene pool management, genetic diversity, hybridization, microsatellite DNA, speciation
Research Division:Biological Sciences
Research Group:Genetics
Research Field:Population, Ecological and Evolutionary Genetics
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Native Forests
Author:Jones, RC (Dr Rebecca Jones)
Author:Steane, DA (Dr Dorothy Steane)
Author:Vaillancourt, RE (Professor Rene Vaillancourt)
Author:Potts, BM (Professor Brad Potts)
ID Code:81249
Year Published:2013
Web of Science® Times Cited:15
Deposited By:Plant Science
Deposited On:2012-11-27
Last Modified:2017-11-03
Downloads:464 View Download Statistics

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