Buxus and Tetracentron genomes help resolve eudicot genome history

Andre S. Chanderbali (), Lingling Jin, Qiaoji Xu, Yue Zhang, Jingbo Zhang, Shuguang Jian, Emily Carroll, David Sankoff, Victor A. Albert, Dianella G. Howarth, Douglas E. Soltis and Pamela S. Soltis
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Andre S. Chanderbali: University of Florida
Lingling Jin: University of Saskatchewan
Qiaoji Xu: University of Ottawa
Yue Zhang: University of Ottawa
Jingbo Zhang: Department of Biological Sciences, St. John’s University
Shuguang Jian: South China Botanical Garden, Chinese Academy of Sciences
Emily Carroll: University at Buffalo
David Sankoff: University of Ottawa
Victor A. Albert: University at Buffalo
Dianella G. Howarth: Department of Biological Sciences, St. John’s University
Douglas E. Soltis: University of Florida
Pamela S. Soltis: University of Florida

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Ancient whole-genome duplications (WGDs) characterize many large angiosperm lineages, including angiosperms themselves. Prominently, the core eudicot lineage accommodates 70% of all angiosperms and shares ancestral hexaploidy, termed gamma. Gamma arose via two WGDs that occurred early in eudicot history; however, the relative timing of these is unclear, largely due to the lack of high-quality genomes among early-diverging eudicots. Here, we provide complete genomes for Buxus sinica (Buxales) and Tetracentron sinense (Trochodendrales), representing the lineages most closely related to core eudicots. We show that Buxus and Tetracentron are both characterized by independent WGDs, resolve relationships among early-diverging eudicots and their respective genomes, and use the RACCROCHE pipeline to reconstruct ancestral genome structure at three key phylogenetic nodes of eudicot diversification. Our reconstructions indicate genome structure remained relatively stable during early eudicot diversification, and reject hypotheses of gamma arising via inter-lineage hybridization between ancestral eudicot lineages, involving, instead, only stem lineage core eudicot ancestors.

Date: 2022
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DOI: 10.1038/s41467-022-28312-w

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