Molecular Phylogenetics and Evolution 100 (2016) 31–40 Contents lists available at ScienceDirect Molecular Phylogenetics and Evolution journal homepage: www.elsevier.com/locate/ympev Clade-speciﬁc positive selection on a developmental gene: BRANCHLESS TRICHOME and the evolution of stellate trichomes in Physaria (Brassicaceae) Abigail R. Mazie , David A. Baum Department of Botany, University of Wisconsin-Madison, 132 Birge Hall, 430 Lincoln Drive, Madison, WI 53706, United States article i nfo abstract Article history: Positive selection is known to drive the evolution of genes involved in evolutionary arms races, but what Received 16 September 2015 role does it play in the evolution of genes involved in developmental processes? We used the Revised 18 March 2016 single-celled epidermal trichomes of Brassicaceae as a model to uncover the molecular evolutionary pro- Accepted 21 March 2016 cesses that contributed to the transition from dendritic trichomes, as seen in most species of Available online 22 March 2016 Brassicaceae, to the distinctive stellate trichomes of the genus Physaria. We explored the role of positive selection on the evolution of BRANCHLESS TRICHOME (BLT), a candidate gene for changes in trichome branch- Keywords: ing pattern. Maximum likelihood models of codon evolution point to a shift in selective pressure affecting the Molecular evolution evolution
Molecular Phylogenetics and Evolution – Elsevier
Published: Jul 1, 2016
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