Abstract Detail

Genomics / Proteomics

Qi, Xinshuai [1], An, Hong [2], Hall, Tara [3], Pires, Joseph Chris [4], Barker, Michael S [5].

Significant genetic structure and variation among domesticated Brassica rapa subspecies uncovered by transcriptomics.

Brassica rapa crops are known for their outstanding morphological diversity – including Chinese cabbage, Pak Choi, turnip, sarson and other morphotypes. To explore the phylogenetic relationships and domestication history of these diverse subspecies, we generated high density genome-wide SNPs from transcriptome data for 143 accessions collected from around the world using. Analyses of more than 27,000 SNPs across the Brassica rapa genome revealed evidence for six distinct genetic groups. Patterns of variation among the SNPs supported the traditionally recognized South Asian and East Asian Brassica rapa groups and indicated that they were independently introduced from Europe (and/or Central Asia). In addition, our analyses bring several new insights on the relationships of Brassica rapa subspecies; for example, subspecies sylvestris is neither a wild type nor the earliest domesticated subspecies as previously thought. We found that two widely recognized Indian cultivars (yellow and brown sarsons) are genetically indistinguishable. Based on multiple population genetic tests, our results suggest crop domestication and improvement are not always associated with strong founder effects.

1 - University of Arizona, Ecology & Evolutionary Biology, Tucson, AZ, 85721, USA
2 - University of Missouri-Columbia, Biological Sciences, 311 Bond Life Science Center, Columbia, Missouri, 65201, United States
3 - University of Arizona, Department of Ecology & Evolutionary Biology, Tucson, AZ, 85721, USA
4 - University Of Missouri, 371 Bond Life Sciences Center, 1201 Rollins Street, Columbia, MO, 65211-7310, USA
5 - University Of Arizona, Department Of Ecology & Evolutionary Biology, P.O. Box 210088, Tucson, AZ, 85721, USA

Keywords:
domestication
Transcriptomics
phylogenomics
Phylogeography
polyploidy.

Presentation Type: Oral Paper
Session: 27, Genomics & Proteomics II
Location: 105/Savannah International Trade and Convention Center
Date: Tuesday, August 2nd, 2016
Time: 2:00 PM
Number: 27003
Abstract ID:881
Candidate for Awards:Margaret Menzel Award