Abstract Detail

Crops and Wild Relatives

Pires, Joseph [1], An, Hong [2], Qi, Xinshuai [3], Gaynor, Michelle [4], Hao, Yue [5], Mabry, Makenzie [6], Conant, Gavin [5], Barker, Michael [7].

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

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 + wild relatives. Utilizing RNA-seq of B. napus accessions, we defined 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 over 8,000 differentially expressed genes with implications for B. napus diversification. This study highlights the origin and diversification of B. napus providing new insights that can further facilitate B. napus breeding and germplasm preservation.

1 - University Of Missouri, 371 Bond Life Sciences Center, 1201 Rollins Street, Columbia, MO, 65211, United States
2 - University of Missouri
3 - University Of Arizona, 2929 E 6th Street Apt 210, Tucson, AZ, 85716.0, United States
4 - NA, Gainesville, FL, 32601, United States
5 - North Carolina State University
6 - University Of Missouri, Biological Sciences, 1201 Rollins St., Columbia, MO, 65201, United States
7 - Department Of Ecology & Evolutionary Biology, P.O. Box 210088, Tucson, AZ, 85721, United States

Keywords:
Polyploid
hybrid
domestication
brassica
Transcriptomics
Population genetics/genomics
crops and wild relatives.

Presentation Type: Oral Paper
Session: CWR1, Crops and Wild Relatives
Location: Tucson D/Starr Pass
Date: Wednesday, July 31st, 2019
Time: 10:15 AM
Number: CWR1009
Abstract ID:232
Candidate for Awards:None