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Abstract Detail

Polyploidy, microevolution and species level systematics

Soza, Valerie [1], Haworth, Kendall [1], Di Stilio, Veronica [2].

Testing correlated evolution of polyploidy, sexual system and pollination mode in Thalictrum (Ranunculaceae).

Polyploidy has a long history of recognized relevance to the evolution of plants, as both allo- and autopolyploidy can contribute to plant speciation. The discovery of ancient whole genome duplications in the common ancestors of seed plants, angiosperms, and core eudicots has renewed interest in polyploidy and its potential effect on the diversification of major plant groups. Polyploidy has been linked to changes in morphology, to the evolution of gender dimorphism, and to changes in ecological interactions, such as pollinator visitation. Thalictrum (Ranunculaceae) is an ideal study group to examine the evolution of polyploidy and its links to changes in floral morphology due to its vast ploidy range and its diversity in sexual system and pollination mode. Here, we take a molecular systematics approach to examine the frequency and timing of polyploidization within Thalictrum and test its correlation to changes in sexual system and pollination mode. We used Bayesian and likelihood analyses based on chloroplast and nuclear loci for phylogenetic reconstructions, estimates of polyploidization events, correlation tests, and molecular dating. Our results suggest that polyploidization occurred frequently and recently in the evolution of Thalictrum, mostly within the last 10.6-5.8 my, coinciding with the diversification of particular clades. Polyploidy is not significantly correlated with dioecy, yet we found a significant association between polyploidy and shifts to wind pollination in Thalictrum.

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1 - University of Washington, Department of Biology, BOX 351800, SEATTLE, WA, 98195-1800, USA
2 - University of Washington, Kincaid Hall 24, PO BOX 351800, SEATTLE, WA, 98115-1800, USA

wind pollination

Presentation Type: Symposium or Colloquium Presentation
Session: C9
Location: Belle-Chasse/Riverside Hilton
Date: Wednesday, July 31st, 2013
Time: 4:15 PM
Number: C9007
Abstract ID:807
Candidate for Awards:None

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