# Evolutionary history and genomic consequences of polyploidization in natural populations of Orychophragmus taibaiensis

## TL;DR

This study explores how genome doubling in a plant species affects genetic diversity and evolution, revealing that tetraploids accumulate more harmful mutations and show changes in gene expression.

## Contribution

The study provides new insights into the genomic consequences of polyploidization in natural populations of Orychophragmus taibaiensis.

## Key findings

- Tetraploids in Orychophragmus taibaiensis accumulated a higher genetic load of deleterious mutations.
- Genome doubling was associated with pronounced changes in gene expression patterns.
- Relaxed purifying selection and allelic redundancy likely contribute to the evolutionary potential of polyploids.

## Abstract

Polyploidization has occurred throughout the tree of life and is particularly common in plants. Despite its ubiquity, our understanding of the short- and long-term effects and consequences of genome doubling in natural populations remains incomplete. In this study, we identified a novel ploidy-variable species system within the ornamental and industrial oilseed genus Orychophragmus (Brassicaceae), which comprises six species, including diploid and tetraploid cytotypes of Orychophragmus taibaiensis. By integrating population-scale genomic and transcriptomic datasets across the species in this genus, we constructed a robust phylogenetic framework and investigated the divergence and demographic history of O. taibaiensis in comparison to its relatives. Specifically, we characterized the geographical distribution patterns of diploids and tetraploids in natural populations of O. taibaiensis, confirmed the autopolyploid origin of tetraploids, and inferred their origin time relative to diploid counterparts. Our findings further revealed that, following genome doubling, tetraploids accumulated a higher genetic load of deleterious mutations, likely due to relaxed purifying selection facilitated by allelic redundancy. Additionally, genome doubling was associated with pronounced changes in gene expression patterns, with differentially expressed genes evolving under relaxed selective constraints. These results highlight that the initial masking of deleterious mutations, changes in expression regulation, and divergent efficacy of selection likely all contribute to shaping the establishment and evolutionary potential of polyploids.