Seeing through the hedge: Phylogenomics of Thuja (Cupressaceae) reveals prominent incomplete lineage sorting and ancient introgression for Tertiary relict flora.
Journal
Cladistics : the international journal of the Willi Hennig Society
ISSN: 1096-0031
Titre abrégé: Cladistics
Pays: United States
ID NLM: 9881057
Informations de publication
Date de publication:
04 2022
04 2022
Historique:
revised:
15
08
2021
received:
29
03
2021
accepted:
27
08
2021
pubmed:
23
9
2021
medline:
6
5
2022
entrez:
22
9
2021
Statut:
ppublish
Résumé
The Eastern Asia (EA) - North America (NA) disjunction is a well-known biogeographic pattern of the Tertiary relict flora; however, few studies have investigated the evolutionary history of this disjunction using a phylogenomic approach. Here, we used 2369 single copy nuclear genes and nearly full plastomes to reconstruct the evolutionary history of the small Tertiary relict genus Thuja, which consists of five disjunctly distributed species. The nuclear species tree strongly supported an EA clade Thuja standishii-Thuja sutchuenensis and a "disjunct clade", where western NA species T. plicata is sister to an EA-eastern NA disjunct Thuja occidentalis-Thuja koraiensis group. Our results suggested that the observed topological discordance among the gene trees as well as the cytonuclear discordance is mainly due to incomplete lineage sorting, probably facilitated by the fast diversification of Thuja around the Early Miocene and the large effective population sizes of ancestral lineages. Furthermore, approximately 20% of the T. sutchuenensis nuclear genome is derived from an unknown ancestral lineage of Thuja, which might explain the close resemblance of its cone morphology to that of an ancient fossil species. Overall, our study demonstrates that single genes may not resolve interspecific relationships for disjunct taxa, and that more reliable results will come from hundreds or thousands of loci, revealing a more complex evolutionary history. This will steadily improve our understanding of their origin and evolution.
Banques de données
Dryad
['10.5061/dryad.44j0zpcd8']
Types de publication
Journal Article
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Langues
eng
Sous-ensembles de citation
IM
Pagination
187-203Subventions
Organisme : Fundamental Research Funds for the Central Universities
ID : SCU2020D003
Organisme : Fundamental Research Funds for the Central Universities
ID : SCU2021D006
Organisme : National Science Foundation of China
ID : U20A2080
Organisme : National Science Foundation of China
ID : 31622015
Informations de copyright
© 2021 Willi Hennig Society.
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