The rare silver gum, Eucalyptus cordata, is leaving its trace in the organellar gene pool of Eucalyptus globulus

G E McKinnon; R E Vaillancourt; Dorothy A Steane; Brad M Potts

doi:10.1111/j.1365-294X.2004.02364.x

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The rare silver gum, Eucalyptus cordata, is leaving its trace in the organellar gene pool of Eucalyptus globulus

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The rare silver gum, Eucalyptus cordata, is leaving its trace in the organellar gene pool of Eucalyptus globulus

G E McKinnon, R E Vaillancourt, Dorothy A Steane and Brad M Potts

Molecular Ecology, Vol.13(12), pp.3751-3762

2004

DOI: https://doi.org/10.1111/j.1365-294X.2004.02364.x

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Abstract

Biological Sciences

chloroplast

eucalypt genetics

eucalyptus

introgression

phylogeography

hybrid

The process of genetic assimilation of rare species by hybridizing congeners has been documented in a number of plant genera. This raises the possibility that some of the genetic diversity found in phylogeographical studies of widespread species has been acquired through hybridization with species that are now rare or extinct. In this fine-scale phylogeographical analysis, we show that a rare eucalypt species is leaving its trace in the chloroplast genome of a more abundant congener. The heart-leafed silver gum, Eucalyptus cordata, is a rare endemic of south-eastern Tasmania. Its populations are scattered amidst populations of more abundant related species, including the Tasmanian blue gum, Eucalyptus globulus. Using 339 samples from across the full range of both species, we compared chloroplast (cp) DNA haplotype phylogeography in E. globulus and E. cordata. The genealogy and distribution of chloroplast haplotypes suggest that E. globulus has acquired cpDNA from E. cordata in at least four different mixed populations. Shared haplotypes are highest in E. globulus sampled within 2 km of known E. cordata populations and drop to zero at a distance of 25 km from the nearest known E. cordata population. Localized haplotype sharing occurs in the absence of obvious hybrid zones or locally shared nuclear ribosomal DNA sequences. Given that the future loss of E. cordata from some mixed populations is likely, these findings indicate that phylogeographical analyses of organellar DNA should consider the possibility of introgression, even from species that have been eliminated from the sites of interest.

Details

Title: The rare silver gum, Eucalyptus cordata, is leaving its trace in the organellar gene pool of Eucalyptus globulus
Authors: G E McKinnon (Author) - University of Tasmania
R E Vaillancourt (Author) - University of Tasmania
Dorothy A Steane (Author) - University of Tasmania
Brad M Potts (Author) - University of Tasmania
Publication details: Molecular Ecology, Vol.13(12), pp.3751-3762
Publisher: Wiley-Blackwell Publishing Ltd.
Date published: 2004
DOI: 10.1111/j.1365-294X.2004.02364.x
ISSN: 0962-1083
Organisation Unit: University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99450139602621
Output Type: Journal article

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Web Of Science research areas: Biochemistry & Molecular Biology; Ecology; Evolutionary Biology