Abstract Detail

Molecular Ecology

An, Hong [1], Mabry, Makenzie [2], Blischak, Paul [3], Pires, Joseph [4], McAlvay, Alex [5].

Untangling parallel evolution and expansion of leafy and turnip morphotypes in Brassica rapa.

Crop diversification not only enriches food diversity but also supplies more comprehensive nutrition to human beings. As an important vegetable resource, Brassica rapa has been domesticated and diversified into various morphotypes under artificial selection. While past studies have sought to understand the origins and diversification of B. rapa crops, it has not been clear whether the different analogous groups are formed by parallel evolution or human-mediated expansion. To address this question, we analyzed 177 B. rapa samples including wild, feral, leafy, turnip, and oilseed types using more than 3.4 million SNPs obtained from whole-genome resequencing data. Using B. oleracea as the outgroup, our phylogenetic and genetic structure analyses identify one wild, one feral, five leafy, three turnip, and three oilseed groups mainly based on their geographic distributions. The five leafy groups include the Mediterranean region: rapini and grelos, the East Asian region: pak choi, napa cabbage, and the Japanese leafy group. The three turnip groups are Central Asian turnips, Middle Eastern turnips, and European turnips. Brown sarson, yellow sarson, and Chinese oilseed are the three oilseed groups. Genetic diversity and FST analyses show yellow sarson and napa cabbage may have undergone a strong founder effect or intensive breeding. Next, we will do selective sweep and demographic inference of the five leafy groups and three turnip groups separately to further untangle the breeding history and the new-morphotype formation process of B. rapa.

1 - University of Missouri, 1201 Rollins St, Bond Life Science Center, Columbia, MO, 65201, United States
2 - University Of Florida, Florida Museum Of Natural History, 1659 Museum Road, Gainesville, FL, 32611, United States
3 - Bayer Crop Science, 800 N Lindbergh Blvd, St. Louis, MO, 63141, USA
4 - New York Botanical Garden, International Plant Science Center, Bronx, NY, 10458, USA
5 - New York Botanical Garden, Institute of Economic Botany, 2900 Southern Blvd, Bronx, NY, 10458, USA

parallel evolution
Brassica rapa

Presentation Type: Oral Paper
Number: ME1003
Abstract ID:478
Candidate for Awards:None

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