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Phylogenetic relationships and generic delimitation in Inuleae subtribe Inulinae (Asteraceae) based on ITS and cpDNA
Markus Englund1,2, Pimwadee Pornpongrungrueng3, Mats H G Gustafsson3
1Department of Botany, Stockholm University, SE-10691 Stockholm, Sweden.
Cladistics : the International Journal of the Willi Hennig Society
|December 9, 2021
Summary
Phylogenetic analysis reveals that the genera Inula and Pulicaria are not monophyletic. DNA data suggest ancient hybridization events and support the recognition of distinct "Inula" and "Pulicaria" complexes.
Area of Science:
- Plant Systematics
- Molecular Phylogenetics
- Evolutionary Biology
Background:
- The subtribe Inulinae within the Asteraceae family exhibits complex phylogenetic relationships.
- Previous classifications of genera like Inula and Pulicaria may not reflect their evolutionary history.
Purpose of the Study:
- To resolve the phylogenetic relationships within the Inuleae subtribe Inulinae (Asteraceae).
- To investigate potential conflicts between chloroplast and nuclear DNA data.
- To assess the monophyly of key genera and propose taxonomic revisions.
Main Methods:
- DNA sequence data from three chloroplast regions (ndhF, trnL-F, psbA-trnH) and the nuclear ribosomal internal transcribed spacer (ITS) region were analyzed.
- Phylogenetic analyses were conducted using parsimony and Bayesian inference methods.
- Partitioned Bremer Support (PBS) was used to assess conflicts between data partitions, considering individual trees and PBS ranges.
Main Results:
- Neither Inula nor Pulicaria were found to be monophyletic.
- A monophyletic 'Inula complex' was identified, including species from Inula and related genera (Telekia, Carpesium, etc.).
- A monophyletic 'Pulicaria complex' was identified, with Francoeuria recognized as a distinct genus separate from Pulicaria.
Conclusions:
- Significant conflicts in the phylogenetic tree suggest ancient hybridization events within Inulinae.
- The current generic circumscriptions of Inula and Pulicaria require revision.
- The study supports the recognition of distinct evolutionary lineages, including the 'Inula complex', 'Pulicaria complex', and the separation of Francoeuria.
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