Incongruence between chloroplast and species phylogenies in Eucalyptus subgenus Monocalyptus (Myrtaceae)

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

doi:10.2307/2656621

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Incongruence between chloroplast and species phylogenies in Eucalyptus subgenus Monocalyptus (Myrtaceae)

Journal article

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Incongruence between chloroplast and species phylogenies in Eucalyptus subgenus Monocalyptus (Myrtaceae)

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

American Journal of Botany, Vol.86(7), pp.1038-1046

1999

DOI: https://doi.org/10.2307/2656621

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Abstract

Plant Biology

Evolutionary Biology

Ecology

chloroplast DNA

eucalyptus

hybridization

myrtaceae

reticulate evolution

Seventy-eight polymorphic cpDNA (chloroplast DNA) characters were found in 13 closely related taxa from Eucalyptus series Amygdalinae (subgenus Monocalyptus) and seven potential outgroup taxa. The strict consensus of six cladograms generated from cpDNA data confirmed monophyly of Monocalyptus. However, cpDNA phylogeny within Monocalyptus was incongruent with taxonomic classification, being more related to geography, even when accessions were from divergent series. Monocalyptus cpDNA formed two major clades. On the island of Tasmania cpDNA was restricted to a single clade, exhibited very little variation, and was phylogenetically related to cpDNA found in central and western Victoria. In contrast, cpDNA of mainland monocalypt taxa was more variable, even within the Amygdalinae. Four out of six Tasmanian Amygdalinae species were polymorphic. The difference between cpDNA of replicates was often greater than differences between species from different series. The low level of cpDNA variation and extensive morphological intergradation between the Tasmanian endemics suggest recent speciation. However, the transfer of cpDNA through hybridization between lineages is the most likely explanation for the observed sharing of cpDNA across series. This study highlights that the geographical pattern to cpDNA variation in Eucalyptus may be an important source of information on past plant distributions in Australia.

Details

Title: Incongruence between chloroplast and species phylogenies in Eucalyptus subgenus Monocalyptus (Myrtaceae)
Authors: G E McKinnon (Author) - University of Tasmania
Dorothy A Steane (Author) - University of Tasmania
Brad M Potts (Author) - University of Tasmania
R E Vaillancourt (Author) - University of Tasmania
Publication details: American Journal of Botany, Vol.86(7), pp.1038-1046
Publisher: Botanical Society of America, Inc.
Date published: 1999
DOI: 10.2307/2656621
ISSN: 0002-9122
Organisation Unit: University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99450489802621
Output Type: Journal article

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