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Microsatellite and cpDNA variation in island and mainland populations of a regionally rare eucalypt, Eucalyptus perriniana (Myrtaceae)

Citation

Rathbone, DA and McKinnon, GE and Potts, BM and Steane, DA and Vaillancourt, RE, Microsatellite and cpDNA variation in island and mainland populations of a regionally rare eucalypt, Eucalyptus perriniana (Myrtaceae), Australian Journal of Botany, 55, (5) pp. 513-520. ISSN 0067-1924 (2007) [Refereed Article]

DOI: doi:10.1071/BT06203

Abstract

Eucalyptus perriniana F.Muell. ex Rodway is distributed over a wide geographic range in south-eastern Australia as a series of small and isolated populations. In Tasmania, there are only three known populations that are separated by 511 km from the closest population on mainland Australia, which is one of the largest disjunctions observed for any eucalypt species. This project utilised eight nuclear microsatellites and one chloroplast DNA marker to study the genetic diversity in E. perriniana and determine the affinities between the populations. In all, 302 individuals in nine populations across the whole range of the species were sampled. The overall nuclear microsatellite diversity in E. perriniana (Ht ≤ 0.85), as well as the diversity in each population (He ≤ 0.73), was comparable to that found in widespread eucalypt species that have much larger population sizes. The microsatellites revealed that the isolated Tasmanian populations were significantly differentiated from mainland populations (FST between regions ≤ 0.08), although the mainland Baw Baw population was the most differentiated. Most populations harboured different chloroplast DNA haplotypes, but in general, there were more mutational differences among haplotypes found in Tasmania than between Tasmanian and mainland populations. The Tasmanian populations often shared chloroplast DNA haplotypes with other eucalypts from south-eastern Tasmania. In conclusion, the populations of E. perriniana are genetically variable and significantly differentiated, with geographic separation being a poor predictor of the amount of genetic divergence. The most divergent populations are those in Tasmania and on Mt Baw Baw and their conservation is important to capture the genetic diversity in the species. © CSIRO 2007.

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Genetics
Research Field:Population, Ecological and Evolutionary Genetics
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Environmental Sciences
Author:Rathbone, DA (Mr Damien Rathbone)
Author:McKinnon, GE (Dr Gay McKinnon)
Author:Potts, BM (Professor Brad Potts)
Author:Steane, DA (Dr Dorothy Steane)
Author:Vaillancourt, RE (Professor Rene Vaillancourt)
ID Code:46847
Year Published:2007
Web of Science® Times Cited:15
Deposited By:Plant Science
Deposited On:2007-08-01
Last Modified:2009-07-31
Downloads:0

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