Plastome phylogenomics and morphological traits analyses provide new insights into the phylogenetic position, species delimitation and speciation of Triplostegia (Caprifoliaceae)

Qing-Li Fu, Zhi-Qiong Mo, Xiao-Guo Xiang, Richard I. Milne, Hans Jacquemyn, Kevin S. Burgess, Ya-Nan Sun, Hua Yan, Li Qui, Bo-Yun Yang, Shao-Lin Tan*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

Background The genus Triplostegia contains two recognized species, T. glandulifera and T. grandifora, but its phylogenetic position and species delimitation remain controversial. In this study, we assembled plastid genomes and nuclear ribosomal DNA (nrDNA) cistrons sampled from 22 wild Triplostegia individuals, each from a separate population, and examined these with 11 recently published Triplostegia plastomes. Morphological traits were measured from herbarium specimens and wild material, and ecological niche models were constructed.
Results Triplostegia is a monophyletic genus within the subfamily Dipsacoideae comprising three monophyletic species, T. glandulifera, T. grandifora, and an unrecognized species Triplostegia sp. A, which occupies much higher altitude than the other two. The new species had previously been misidentifed as T. glandulifera, but difers in taproot, leaf, and other characters. Triplotegia is an old genus, with stem age 39.96Ma, and within it T. glandulifera diverged 7.94Ma. Triplostegia grandifora and sp. A diverged 1.05Ma, perhaps in response to Quaternary climate fuctuations. Niche overlap between Triplostegia species was positively correlated with their phylogenetic relatedness.
Conclusions Our results provide new insights into the species delimitation of Triplostegia, and indicate that a taxonomic revision of Triplostegia is needed. We also identifed that either rpoB-trnC or ycf1 could serve as a DNA barcode for Triplostegia
Original languageEnglish
Article number645
Number of pages18
JournalBMC Plant Biology
Volume23
Early online date15 Dec 2023
DOIs
Publication statusPublished - 15 Dec 2023

Keywords / Materials (for Non-textual outputs)

  • Plastid genome
  • Phylogenomics
  • Speciation
  • Species delimitation
  • Triplostegia

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