Genetic variation within two sympatric spotted gum Eucalypts exceeds between taxa variation

J W Ochieng; M Shepherd; P R Baverstock; G Nikles; David J Lee; R Henry

doi:10.1515/sg-2008-0038

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Genetic variation within two sympatric spotted gum Eucalypts exceeds between taxa variation

Journal article

Peer reviewed

Genetic variation within two sympatric spotted gum Eucalypts exceeds between taxa variation

J W Ochieng, M Shepherd, P R Baverstock, G Nikles, David J Lee and R Henry

Silvae Genetica, Vol.57(4-5), pp.249-256

2008

DOI: https://doi.org/10.1515/sg-2008-0038

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Abstract

panmixia

hybridization

gene flow

association mapping

population structure

admixture

reproductive isolation

linkage disequilibrium

Population substructure and hybridization, among other factors, have the poten-tial to cause erroneous associations in linkage disequilibrium (LD) mapping. Two closely related spotted gum eucalypts, Corymbia variegata and C. henryi (Myrta-ceae) occur in sympatry in the east coast of Australia and potentially interbreed. They are morphologically similar but are distinguished as separate species based on capsule and foliage size. To determine whether they hybridize in nature and its implications for LD mapping, we investigated the level of molecular diver-gence between the two species at two sympatric locations separated by 300 kilometres. Very few individuals of intermediate morphology were identified, de-spite the two species occurring only metres apart. Analysis of genetic structure using 12 microsatellite loci showed that genetic differentiation between popu-lations of the same species at different locations (FST = 0.07 for both species; p = 0.0001) was significantly higher than that observed between species at each location (mean FST = 0.02 and 0.04 for Cherry tree and Bunyaville respectively; p = 0.0001; all Mann-Whitney U-test p ≤ 0.01). No species-specific alleles or significant allele frequency differences were detected within a site, suggesting recurrent local gene flow between the two species. The lack of significant allele frequency differences implies no population stratification along taxonomic lines. This suggested that there is little concern for cryptic hybridization when sampling from sites of sympatry for LD mapping.

Details

Title: Genetic variation within two sympatric spotted gum Eucalypts exceeds between taxa variation
Authors: J W Ochieng (Author) - Southern Cross University
M Shepherd (Author) - Southern Cross University
P R Baverstock (Author) - Southern Cross University
G Nikles (Author) - Queensland Department of Primary Industries and Fisheries
David J Lee (Author) - Queensland Department of Primary Industries and Fisheries
R Henry (Author) - Southern Cross University
Publication details: Silvae Genetica, Vol.57(4-5), pp.249-256
Publisher: J.D. Sauerlaender's Verlag
Date published: 2008
DOI: 10.1515/sg-2008-0038
ISSN: 0037-5349
Organisation Unit: Tropical Forests and People Research Centre; University of the Sunshine Coast, Queensland; Forest Industries Research Centre; Forest Research Institute
Language: English
Record Identifier: 99449808302621
Output Type: Journal article

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Collaboration types: Domestic collaboration; International collaboration
Web Of Science research areas: Forestry; Genetics & Heredity