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1 July 2013 Phylogeny of Leavenworthia and Selenia (Brassicaceae)
Lillis Urban, C. Donovan Bailey
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Abstract

The present study aimed to develop a robust, extensively sampled phylogenetic hypothesis across all species in Leavenworthia and Selenia using chloroplast (psbJpetA) and nuclear encoded (nrDNA ITS and LUMINIDEPENDENS) DNA sequence data. Parsimony and maximum likelihood methodologies were employed. Strong maximum likelihood bootstrap and parsimony jackknife support were recovered for the monophyly of the sister pair Leavenworthia plus Selenia and for the respective monophyly of each genus. Leavenworthia and Selenia are hypothesized to have diverged in the Ozark Mountains and results from an analysis of branch lengths leading to Leavenworthia and Selenia clades are consistent with Leavenworthia having diversified more recently than Selenia. Polyploidy and extensive aneuploidy complicate the interpretation of chromosomal evolution within and between these genera. Comparative results from phylogenetic analyses indicate that L. aurea and L. texana are hybrids with a shared set of putative parents. Lastly, patterns of diversification within Leavenworthia appear to have included a minimum of three transformations from self-incompatible to self-compatible systems.

© Copyright 2013 by the American Society of Plant Taxonomists
Lillis Urban and C. Donovan Bailey "Phylogeny of Leavenworthia and Selenia (Brassicaceae)," Systematic Botany 38(3), 723-736, (1 July 2013). https://doi.org/10.1600/036364413X670322
Published: 1 July 2013
JOURNAL ARTICLE
14 PAGES


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KEYWORDS
evolution
LUMINIDEPENDENS
nrDNA ITS
psbJ—petA
self-incompatibility
simultaneous analysis
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