Global genomic population structure of wild and cultivated oat reveals signatures of chromosome rearrangements

Wubishet A. Bekele, Raz Avni, Clayton L. Birkett, Asuka Itaya, Charlene P. Wight, Justin Bellavance, Sophie Brodführer, Francisco J. Canales, Craig H. Carlson, Anne Fiebig, Yongle Li, Steve Michel, Raja Sekhar Nandety, David J. Waring, Juan D. Arbelaez, Aaron D. Beattie, Melanie Caffe, Isabel A. del Blanco, Jason D. Fiedler, Rajeev GuptaLucia Gutierrez, John C. Harris, Stephen A. Harrison, Matthias H. Herrmann, Yung-Fen Huang, Julio Isidro y Sanchez, Michael S. McMullen, Jennifer W. Mitchell Fetch, Kirby T. Nilsen, Isobel A. P. Parkin, YuanYing Peng, Kevin P. Smith, Tim Sutton, Weikai Yan, Pamela Zwer, Axel Diederichsen, Kathy Esvelt Klos, Yong-Bi Fu, Catherine J. Howarth, Jean-Luc Jannink, Eric N. Jellen, Tim Langdon, Peter J. Maughan, Edyta Paczos-Grzeda, Elena Prats, Taner Z. Sen, Martin Mascher, Nicholas A. Tinker

Research output: Working paperPreprint

Abstract

The genus Avena consists of approximately 30 wild and cultivated oat species. Cultivated oat is an important food crop, yet the broader genetic diversity within the Avena gene pool remains underexplored and underexploited. We characterized over 9,000 wild and cultivated hexaploid oat accessions of global origin using genotyping-by-sequencing. We explored population structure using multidimensional scaling and population-based clustering methods. We also conducted analyses to reveal chromosome regions associated with local adaptation, sometimes resulting from large scale chromosome rearrangements. Here, we report four distinct genetic populations within the wild species A. sterilis, a distinct population of cultivated A. byzantina, and multiple populations within cultivated A. sativa. Some chromosome regions associated with local adaptation are also associated with confirmed structural rearrangements on chromosomes 1A, 1C, 3C, 4C, and 7D. This work provides evidence suggesting multiple polyploid origins, multiple domestications, and/or reproductive barriers amongst Avena populations caused by differential chromosome structure.
Original languageEnglish
PublisherResearch Square
DOIs
Publication statusPublished - 31 Dec 2024

Keywords

  • plant molecular biology and genetics
  • population genetics
  • Avena
  • population structure
  • chromosome rearrangements

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