Phylogenomics and diversification drivers of the Eastern Asian - Eastern North American disjunct Podophylloideae.

Evolutionary and biogeographic processes determine species richness patterns of vascular plants between Eastern Asia (EA) and Eastern North America (ENA). However, the strikingly higher species richness of EA relative to ENA remains poorly understood from this perspective. Here, we studied the relative importance of biogeographical, evolutionary and ecological factors underlying differences in species richness between EA and ENA in Podophylloideae (Berberidaceae, Ranunculales; in total 10 ssp. in EA vs. 2 spp. in ENA). Based on large-scale transcriptome data, our phylogenomic analyses strongly supported Podophylloideae and its two multi-species genera, i.e. Dysosma (EA) and Diphylleia (EA/ENA), as monophyletic groups. Sinopodophyllum hexandrum (EA) was identified as sister to the remainder of Podophylloideae. Dysosma (7 spp.) was recovered as sister to Podophyllum peltatum (ENA), forming an EA-ENA disjunct pair with a strong bias of species diversity in the EA counterpart. Our biogeographic analyses support the 'out-of-Tibet' hypothesis, suggesting that Podophylloideae started to diversify in the Himalaya-Hengduan Mountains (Mid-Miocene) and migrated eastward (since the Late Miocene) into Central-eastern China, Japan, and ENA (only P. peltatum and Diphylleia cymosa). Overall, we conclude that the striking species diversity anomaly between EA and ENA in Podophylloideae may be explained by a combination of a longer period of time available to accumulate species in EA and greater diversification rate in EA, which might have been promoted by greater physiographic and environmental heterogeneity in this region.

• Publication year

  2022

• Venue

  Molecular Phylogenetics and Evolution

• Publication date

  2022-02-01

• Fields of study

  Biology, Medicine, Environmental Science

• Identifiers
  DOI 10.1016/j.ympev.2022.107427PMID 35131422
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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