Abstract Detail


Yan, Yujing [1].

A new nuclear phylogeny unravels fast-moving radiations in the Theaceae.

A robust phylogeny is essential for understanding the evolutionary history of the Theaceae family, which is hypothesized to have undergone several ancient radiations. Conventional molecular markers, such as loci from plastid or single nuclear genes, have so far been insufficient to fully resolve the phylogeny, especially at the backbone of tribe Theeae and genus Camellia. Here, we present a well-resolved Theaceae phylogeny representing 65 species, using a newly generated targeted enrichment sequence dataset of 349 single-copy nuclear genes. The species sampling covers all three recognized tribes, seven out of nine genera, and 10 out of 14 sections within the largest genus Camellia. We compare this newly generated nuclear phylogeny with a previously published phylogenetic hypothesis generated using plastome and ITS data, as well as with a morphology-based classification. The nuclear phylogeny confirmed most of the hypothesized relationships among tribes and genera, but also identified some novel relationships within the tribe Theeae. The analysis particularly clarifies interspecific relationships within the most rapidly radiating genus Camellia, broadly supporting earlier classifications based on morphology that had been questioned by the previous molecular studies. A high-level of incomplete lineage sorting was observed for the dataset which may be a result of ancient radiations. Our study highlights the use of coalescent-based phylogenomic method in resolving the evolutionary relationships using nuclear genes.     

1 - 345 Franklin St, Cambridge, MA, 02139, United States

Target Enrichment
Incomplete lineage sorting
NGS filtering strategies.

Presentation Type: Oral Paper
Session: PHYL1, Phylogenomics I
Location: Virtual/Virtual
Date: Monday, July 27th, 2020
Time: 2:15 PM
Number: PHYL1008
Abstract ID:324
Candidate for Awards:None

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