Systematics/Phytogeography / Taxonomie/ Section
Liu, Chang , Chinnock, Robert J. , Kelchner, Scot A. .
Phylogenetic investigations in Myoporum (Scrophulariaceae: Myoporeae): sequence analysis of one nuclear and six chloroplast loci.
Myoporum is a largely endemic genus of Australian shrubs and trees, with outlying island endemics in the Pacific and Indian oceans. Myoporum is distinguished from other Myoporeae genera by its small, radially symmetric flowers and spherical fleshy fruits. In this study, we investigated the evolutionary relationship among 22 of the 30 recognized Myoporum species, representing all four taxonomic sections and the breadth of morphological diversity in the genus. Six chloroplast noncoding regions provided a supported phylogeny estimation that suggests (1) Myoporum, as currently recognized, is not monophyletic, and (2) most morphological characters used in diagnosing the genus and sections are not synapomorphic. However, signal from the nuclear data is more complicated and potentially conflicting: GBSSI sequences show signs of gene duplication (with polyploidy events) and lineage sorting. Given the low levels of sequence variation that we also observe among these taxa, we conclude that Myoporum is a relatively young lineage with recent or ongoing radiation.
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1 - Idaho State University, Department of Biological Sciences, 921 South 8th Avenue, Stop 8007, Pocatello, ID, 83209-8007, USA
2 - State Herbarium of South Australia, Plant Biodiversity Centre, Hackney Road, Hackney, S.A., 5069, Australia
3 - Idaho State University, Department of Biological Sciences, Campus Box 8007, Pocatello, Idaho, 83209, USA
Presentation Type: Poster:Posters for Sections
Location: Ball Room & Party Room/SUB
Date: Monday, July 28th, 2008
Time: 12:30 PM