Abstract Detail



Phylogenomics

Du, Zhiyuan [1], Xiang, Jenny [2], Harris, AJ [3].

Phylogenomics of Aesculus L. (Sapindaceae) inferred from RAD-seq data – insights into biogeography and evolution of the genus.

The genus Aesculus L. (buckeyes or horsechestnuts; Sapindaceae) consists of 12-14 extant species of trees and shrubs with palmately compound leaves, showy zygomorphic flowers in thyrses, and 1–3 large seeds. The genus is primarily distributed in eastern Asia and eastern North America, with two species native to western North America, and one to southeastern Europe. The genus represents one of the classic examples of intercontinental disjunction of plants in the Northern Hemisphere. The genus has a rich fossil record from all of its modern distributional areas and northern Africa throughout the Cenozoic era. Thus, it is an ideal group for studying the assembly of the disjunct flora in the northern hemisphere. Previous molecular phylogenetic studies of Aesculus used several gene regions and showed an early divergence of Aesculus into five well-supported major lineages in the Paleocene. However, relationships among the major clades remained weakly supported. Here, we conducted phylogenetic study of the genus using genome wide markers from RAD-seq and 90 samples of the 12-14 species. We will use the phylogeny to perform divergence time dating, ancestral area reconstruction, and analyses of niche evolution and diversification rates. We expect that results from these analyses will provide new insights into the origin and evolutionary history of this genus in space and time. Through investigation of diversification rate and its correlation with extrinsic and intrinsic variables we will be able to identify potential ecological and biogeographic factors underlying shifts in diversification rate or driving divergence of morphological features.


1 - 4110, Gardner Hall, Department Of Plant And Microbial Biology, 100 Derieux Place, Raleigh, NC, 27695, United States
2 - North Carolina State University, Gardner Hall 2115, Campus Box 7612, Gardner Hall 2115, Raleigh, NC, 27695, United States
3 - Oberlin College, Department of Biology, Oberlin, OH, 44074, USA

Keywords:
Aesculus
RAD-seq
intercontinental disjunction
Niche Evolution
Biogeography.

Presentation Type: Oral Paper
Number:
Abstract ID:416
Candidate for Awards:None


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