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Molecular genetic diversity and population structure in Eucalyptus pauciflora subsp. pauciflora (Myrtaceae) on the island of Tasmania


Gauli, A and Steane, DA and Vaillancourt, RE and Potts, BM, Molecular genetic diversity and population structure in Eucalyptus pauciflora subsp. pauciflora (Myrtaceae) on the island of Tasmania, Australian Journal of Botany, 62, (3) pp. 175-188. ISSN 0067-1924 (2014) [Refereed Article]

Copyright Statement

Copyright 2014 CSIRO

DOI: doi:10.1071/BT14036


Genetic diversity and population structure of Tasmanian populations of Eucalyptus pauciflora were assessed using chloroplast and nuclear microsatellite markers. Maternal trees and open-pollinated progeny from 37 populations were sampled across the speciesí geographic and altitudinal distribution in Tasmania. The distribution of chloroplast haplotype richness showed a clear geographic structure with suggestion of three major refugia (Storm Bay, Tamar Valley and St Pauls River Valley), two of which are consistent with previously reported glacial refugia. Chloroplast haplotype affinities provided evidence of migration of populations from the north and east towards the south and west of Tasmania. High nuclear microsatellite diversity was observed across the speciesí range. Most of this variation was distributed within populations with low but significant FST, suggesting high gene flow among populations that is more pronounced in mature stands. Higher nuclear genetic diversity in newly colonised areas compared with lowland putative refugial regions, and the converse in chloroplast DNA markers, suggest limited seed dispersal into newly colonised regions combined with high pollen flow between different source populations in newly colonised areas. Our results do not support the suggestion that highland populations of E. pauciflora originate from in situ high-altitude refugia, but instead argue they originate from lowland refugia.

Item Details

Item Type:Refereed Article
Keywords:Eucalyptus pauciflora, genetic diversity, haplotypes, molecular markers, spatial structure
Research Division:Biological Sciences
Research Group:Genetics
Research Field:Genetics not elsewhere classified
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Hardwood plantations
UTAS Author:Gauli, A (Ms Archana Gauli)
UTAS Author:Steane, DA (Dr Dorothy Steane)
UTAS Author:Vaillancourt, RE (Professor Rene Vaillancourt)
UTAS Author:Potts, BM (Professor Brad Potts)
ID Code:98309
Year Published:2014
Funding Support:Australian Research Council (LP120200380)
Web of Science® Times Cited:14
Deposited By:Plant Science
Deposited On:2015-02-11
Last Modified:2017-11-03

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