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Abstract Detail

Mechanisms underlying exceptional plant diversity across eastern Asia

Zhou, Wenbin [1], Harris, AJ [2], Xiang, Jenny [3].

An integrative approach to test biographical hypotheses in nutmeg yew (Torreya) and a practical method for reducing missing data from RAD-seq.

In this study, we sought to better understand the biogeographic origins and diversification of eastern Asian diversity in the intercontinentally disjunct gymnosperm genus, Torreya L. (Taxaceae). Intercontinental floristic disjunction between Eurasia and North America is one of the most well-studied patterns characterizing the distribution of vegetation in the Northern Hemisphere. A prominent feature of this pattern is that most disjunctly distributed lineages exhibit considerably greater diversity in eastern Asia than in the other continental areas of Europe and eastern and western North America. Greater diversity in eastern Asia is widely recognized and studied in angiosperms, but it is also the norm among gymnosperms, including Torreya, which has five species in eastern Asia, none in Europe, and two in North America. Previous phylogeny-based biogeographic analyses have reported a major pattern of "out of North America" origin of the disjunct gymnosperm lineages. Here we sought to reconstruct a robust phylogeny of Torreya using a phylogenomic approach combining RAD-seq and Hyb-Seq data in order to test the "out of North America" hypothesis in this genus. We integrated the phylogenomic data, comprising thousands of molecular loci, with morphology and fossils visa a fossilized-birth-death model of tree reconstruction and dating to resolve species relationships and reveal timing of biogeographical events in Torreya. Our analyses resulted in a well resolved, strongly supported phylogeny of the genus and provided a detailed picture of the biogeographic history that is partially consistent with the "out of North America" hypothesis . Our study demonstrates the value of including as much fossil information as possible for studying the origins mand subsequent radiations of (and extinctions among) intercontinentally disjunct lineages. Additionally, our analyses led to a new pipeline, RADADOR, to supplement data from RAD-seq with publicly available genomic data and overcome loss of loci due to allele-dropout.

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1 - North Carolina State University, Plant & Microbial Biology, Box 7612, 100 Derieux Place Gardner Hall 2115, Raleigh, NC, 27695, United States
2 - South China Botanical Garden, Chinese Academy Of Sciences, Key Laboratory of Plant Resources Conservation and Sustainable Utilization, Xingke Road 723, Tianhe District, Guangzhou, Gungdong, 510650, China
3 - North Carolina State University, Plant And Microbial Biology, Campus Box 7612, Gardner Hall 2115, Raleigh, NC, 27695, United States

eastern Asia-North America disjunction

Presentation Type: Colloquium Presentations
Session: C04, Mechanisms underlying exceptional plant diversity across eastern Asia
Location: /
Date: Tuesday, July 20th, 2021
Time: 12:30 PM(EDT)
Number: C04009
Abstract ID:727
Candidate for Awards:Margaret Menzel Award

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