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Incongruence between chloroplast and species phylogenies in eucalyptus subgenus monocalyptus (Myrtaceae)


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McKinnon, GE, Steane, DA, Potts, BM and Vaillancourt, RE 1999 , 'Incongruence between chloroplast and species phylogenies in eucalyptus subgenus monocalyptus (Myrtaceae)' , American Journal of Botany, vol. 86, no. 7 , pp. 1038-1046 .

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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.

Item Type: Article
Authors/Creators:McKinnon, GE and Steane, DA and Potts, BM and Vaillancourt, RE
Keywords: chloroplast DNA • Eucalyptus • hybridization • Myrtaceae • reticulate evolution
Journal or Publication Title: American Journal of Botany
ISSN: 0002-9122
Additional Information:

BM Potts.© 1999 Botanical Society of America, Inc.

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