ArticlePlant physiology2026
Insights into karyotype evolution and flower color variation from the genome assembly of wallflower (Erysimum cheiri).
Article in Plant physiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 2 papers.
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2 citing papers in PubMed.
- Near telomere-to-telomere genome assembly enables the discovery of introgressed purple-leaf geneHorticulture research · 2026Article
- Perks of being a wallflower: a high-quality wallflower reference genome reveals its chromosome evolution and flower color variation.Plant physiology · 2026Article
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Authors and funding
14 authors.
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Abstract
Wallflower (Erysimum cheiri) belongs to the monogeneric Erysimeae tribe of the mustard family (Brassicaceae). It is widely cultivated as an ornamental garden plant and appreciated for its diverse flower colors. However, the absence of a high-quality genome has hampered research on wallflower genome evolution and the mechanisms underlying variations in flower color. Here, we assembled a nearly gap-free telomere-to-telomere genome of E. cheiri. The assembled genome enabled the reconstruction of genome evolution in the genus Erysimum (274 species), tracing the changes from the ancestral n = 8 genome (in E. cheiranthoides) to the derived genomes with 7 (in E. nevadense) and 6 (in E. cheiri) chromosome pairs. While the reduction from n = 8 to n = 7 was mediated by a nested chromosome fusion accompanied by inversions, the further decrease to n = 6 in E. cheiri resulted from an end-to-end translocation involving the other 2 nonhomologous chromosomes. Compared with other Brassicaceae species, E. cheiri showed a notable expansion of gene families related to secondary metabolite biosynthesis. Its flower color variation is primarily determined by the biosynthesis and accumulation of carotenoids and flavonoids. We mapped the metabolic pathways for carotenoids and flavonoids, identifying the hub genes regulating their biosynthesis. This research lays an important foundation for understanding the chromosomal and genome evolution of the Erysimeae tribe and paves the way for future investigations into genetic studies and breeding applications of E. cheiri.
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