Incomplete lineage sorting and hybridization as drivers of tree discordance in Petunia and related genera (Petunieae, Solanaceae)

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Authors

Pedro Henrique Pezzi , Lucas C Wheeler, Loreta Brandão Freitas, Stacey D. Smith

Abstract

Despite the overarching history of species divergence, phylogenetic studies often reveal distinct topologies across regions of the genome. The sources of these gene tree discordances are variable, but incomplete lineage sorting (ILS) and hybridization are among those with the most significant biological importance. Petunia serves as a classic system for studying hybridization in the wild. While field studies suggest that hybridization is frequent, the extent of reticulation within Petunia and its closely related genera has never been examined from a phylogenetic perspective. In this study, we used transcriptomic data from 11 Petunia, 16 Calibrachoa, and 10 Fabiana species to illuminate the relationships between these species and investigate whether hybridization played a significant role in the diversification of the clade. We identified that tree discordance within genera can be explained by high levels of ILS due to their rapid diversification and hybridization events. Moreover, network analyses indicated hybridization between Petunia and Calibrachoa, genera that have different chromosome numbers. Although these genera cannot hybridize at the present time, ancestral hybridization could have played a role in their parallel radiations, as they share the same habitat and life history.

DOI

https://doi.org/10.32942/X21W31

Subjects

Biodiversity, Bioinformatics, Botany, Genomics

Keywords

gene flow, Incomplete lineage sorting, Introgression, Solanaceae, Speciation., incomplete lineage sorting, introgression, Solanaceae, speciation

Dates

Published: 2024-03-29 04:09

Last Updated: 2024-03-29 11:09

License

CC-BY Attribution-NonCommercial 4.0 International

Additional Metadata

Language:
English

Conflict of interest statement:
None.

Data and Code Availability Statement:
All scripts and processed data files are available at https://github.com/pedrohpezzi/Petunia-Calibrachoa-Fabiana_TreeDiscordance.git and https://figshare.com/s/c3f6e7305660e03031ec. The raw RNA-seq data files are available in SRA under the BioProject accession number PRJNA746328.