Transcriptome and organellar sequencing highlights the complex origin and diversification of allotetraploid Brassica napus

Hong An, Xinshuai Qi, Michelle L. Gaynor, Yue Hao, Sarah C. Gebken, Makenzie E. Mabry, Alex C. McAlvay, Graham R. Teakle, Gavin C. Conant, Michael S. Barker, Tingdong Fu, Bin Yi () and J. Chris Pires ()
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Hong An: University of Missouri
Xinshuai Qi: University of Arizona
Michelle L. Gaynor: University of Central Florida
Yue Hao: North Carolina State University
Sarah C. Gebken: University of Missouri
Makenzie E. Mabry: University of Missouri
Alex C. McAlvay: Cornell University
Graham R. Teakle: University of Warwick
Gavin C. Conant: North Carolina State University
Michael S. Barker: University of Arizona
Tingdong Fu: Huazhong Agricultural University
Bin Yi: Huazhong Agricultural University
J. Chris Pires: University of Missouri

Nature Communications, 2019, vol. 10, issue 1, 1-12

Abstract: Abstract Brassica napus, an allotetraploid crop, is hypothesized to be a hybrid from unknown varieties of Brassica rapa and Brassica oleracea. Despite the economic importance of B. napus, much is unresolved regarding its phylogenomic relationships, genetic structure, and diversification. Here we conduct a comprehensive study among diverse accessions from 183 B. napus (including rapeseed, rutabaga, and Siberian kale), 112 B. rapa, and 62 B. oleracea and its wild relatives. Using RNA-seq of B. napus accessions, we define the genetic diversity and sub-genome variance of six genetic clusters. Nuclear and organellar phylogenies for B. napus and its progenitors reveal varying patterns of inheritance and post-formation introgression. We discern regions with signatures of selective sweeps and detect 8,187 differentially expressed genes with implications for B. napus diversification. This study highlights the complex origin and evolution of B. napus providing insights that can further facilitate B. napus breeding and germplasm preservation.

Date: 2019
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DOI: 10.1038/s41467-019-10757-1

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