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Abstract Detail


Gambhir, Diksha [1], Sanderson, Brian [1], Ma, Tao [2], Percy, Diana [3], Cronk, Quentin [3], Olson, Matt [1].

Resolving the backbone relationships of Poplars and Willows using plastid genome phylogenetic analysis.

The phylogenetic histories of species are complicated. Gene genealogies often have a conflict with speciation history due to incomplete lineage sorting or hybridization. For instance, in the genus  Populus, a conflict between the nuclear species tree and the chloroplast tree indicates an ancient hybridization event between the ancestors of  P. mexicana  and  P. heterophylla. Here we report on the phylogenic relationships among diploid willows (Salix) based on the whole chloroplast genome. The chloroplast genome is maternally inherited and evolves relatively quickly. Therefore, a large amount of diversity data within the chloroplast can be used to reconstruct its singular phylogenetic history. In this study we constructed a chloroplast phylogeny of 64 species of willows and poplars and aimed to examine potential hybridization in willows. We recovered four major clades in  Populus  and two major clades in  Salix.  Based on the fossil calibrations of the chloroplast phylogeny, the four major clades in  Populus  diverged 6-11Mya. The phylogenetic analysis also provided robust branch support across  Salix  family and showed the effectiveness of using complete chloroplast genomes to solve the incomplete lineage sorting in this family. We will report on the presence or absence of ancient hybridization events in  Salix  via comparison of our chloroplast phylogeny with the species tree generated from nuclear data.

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1 - Texas Tech University, Lubbock, Texas, USA
2 - Sichuan University, China
3 - University of British Columbia, Canada

gene flow

Presentation Type: Poster
Session: P3, Phylogenomics Posters
Location: Virtual/Virtual
Date: Wednesday, July 21st, 2021
Time: 5:00 PM(EDT)
Number: P3PL010
Abstract ID:538
Candidate for Awards:None


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