Evidence map›Paper›PMID 40751490›Full record

ArticleAnnals of botany2026

Mesopolyploidy as a taxonomic clade marker for Brassica and relatives (tribe Brassiceae).

Shawn K Thomas, R Shawn Abrahams, Daniel Robert Kick, Nora Walden, Gavin Conant, Michael R McKain, Hong An, Tatiana Arias, Patrick P Edger, Alex Harkess and 9 more

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Article in Annals of botany, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.

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1 citing paper in PubMed.

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5 · Who and what money

Authors and funding

19 authors.

Shawn K ThomasDivision of Biological Sciences, University of Missouri, Columbia, MO 65211, USA.
R Shawn AbrahamsDepartment of Plant Biology, University of Illinois, Urbana-Champaign, IL 61801, USA.
Daniel Robert KickUnited States Department of Agriculture, Agricultural Research Service, Columbia, MO 65211, USA.
Nora WaldenCentre for Organismal Studies, University of Heidelberg, Heidelberg 69120, Germany.
Gavin ConantDepartment of Biological Sciences, North Carolina State University, Raleigh, NC 27695, USA.
Michael R McKainDepartment of Biological Sciences, The University of Alabama, Tuscaloosa, AL 35487, USA.
Hong AnBioinformatics and Analytics Core, University of Missouri, Columbia, MO 65211, USA.
Tatiana AriasGrupo de Investigación Biodiversidad, Medio Ambiente y Salud (BIOMAS), Universidad de Las Américas (UDLA), Quito 170513, Ecuador.
Patrick P EdgerDepartment of Horticulture, Michigan State University, East Lansing, MI 48824, USA.
Alex HarkessHudsonAlpha Institute for Biotechnology, Huntsville, AL 35806, USA.
Kasper P HendriksNaturalis Biodiversity Center, Leiden 2300 RA, The Netherlands.
Marcus A KochCentre for Organismal Studies, University of Heidelberg, Heidelberg 69120, Germany.
Fredric LensNaturalis Biodiversity Center, Leiden 2300 RA, The Netherlands.
Martin A LysakCentral European Institute of Technology and Department of Experimental Plant Biology, Faculty of Science, Masaryk University, Brno 625 00, Czech Republic.
Alex McAlvayCenter for Plants, People, and Culture, New York Botanical Garden, The Bronx, NY 10458, USA.
Klaus MummenhoffDepartment of Biology/Chemistry, University of Osnabrück, Osnabrück D-49076, Germany.
Ihsan A Al-ShehbazMissouri Botanical Garden, St Louis, MO 63110, USA.
Jacob D WashburnPlant Genetics Research Unit, USDA-ARS, Columbia, MO 65211, USA.
J Chris PiresSoil and Crop Sciences, Colorado State University, Fort Collins, CO 80523-1170, USA.

Funding

Research Computing Support Services CNS-1429294University of Missouri, Columbia
6 · The paper itself

Abstract

BACKGROUND AND

aimsWhole-genome duplications (WGDs) are rampant in flowering plant genomes. Within Brassicaceae, the genus Brassica (including crop mustards) and relatives (tribe Brassiceae) are hypothesized to share an ancient mesohexaploidy, or whole-genome triplication (WGT), resulting from two WGD events (Br-α WGT). However, the phylogenetic boundaries of the Br-α WGT remain unknown.

methodsWe use phylogenomic assessments and divergence time analyses to place and date the Br-α WGT. We see conflicting topologies among the plastid and nuclear trees putatively due to polyploidy, hybridization and reticulate evolution. Despite this, we find tribe Brassiceae to be monophyletic in both trees. KEY

resultsAs currently circumscribed, tribe Brassiceae does not share the Br-α WGT. The sister clade to the rest of the tribe, containing the genera Orychophragmus and Sinalliaria, show no evidence of the Br-α WGT. Based on this placement, divergence time analyses indicate that the Br-α WGT would have occurred between 12.1 and 10.7 million years ago.

conclusionsWe propose a new taxonomic revision for the tribe Brassiceae based on the shared characteristics of the Br-α WGT. This presents a stable characteristic for the tribe, which was not the case in previous taxonomies based on morphological characters. These findings help clarify the history of the mustard crops and their relatives and resolve long-standing issues with the circumscription of the tribe Brassiceae.

Indexed as

BrassicaBrassicaceaeGenome, PlantPolyploidyEvolution, MolecularPhylogenyBrassicaBrassicaceaeCruciferaemustard cropsphylogenomicsWhole-genome duplication

Identifiers

PMID40751490
PMCPMC13487437

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