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

R C Jones; Dorothy A Steane; M Lavery; R E Vaillancourt; Brad M Potts

doi:10.1002/ece3.421

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

Journal article

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

R C Jones, Dorothy A Steane, M Lavery, R E Vaillancourt and Brad M Potts

Ecology and Evolution, Vol.3(1), pp.1-17

2013

DOI: https://doi.org/10.1002/ece3.421

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Abstract

blue gum

clinal variation

conservation genetics

evolution

gene pool management

genetic diversity

hybridization

microsatellite DNA

speciation

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.

Details

Title: Multiple evolutionary processes drive the patterns of genetic differentiation in a forest tree species complex
Authors: R C Jones (Author) - University of Tasmania
Dorothy A Steane (Author) - University of the Sunshine Coast - Faculty of Science, Health, Education and Engineering
M Lavery (Author) - Arianda Pty Ltd, Australia
R E Vaillancourt (Author) - University of Tasmania
Brad M Potts (Author) - University of Tasmania
Publication details: Ecology and Evolution, Vol.3(1), pp.1-17
Publisher: John Wiley & Sons Ltd.
Date published: 2013
DOI: 10.1002/ece3.421
ISSN: 2045-7758
Copyright note: Copyright © 2012 The Authors. Published by Blackwell Publishing Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Organisation Unit: University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99450121602621
Output Type: Journal article

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Collaboration types: Domestic collaboration
Web Of Science research areas: Ecology; Evolutionary Biology