Abstract
AbstractDespite early domestication around 3000 BC, the evolutionary history of the ancient allotetraploid species Brassica juncea (L.) Czern & Coss remains uncertain. Here, we report a chromosome-scale de novo assembly of a yellow-seeded B. juncea genome by integrating long-read and short-read sequencing, optical mapping and Hi-C technologies. Nuclear and organelle phylogenies of 480 accessions worldwide supported that B. juncea is most likely a single origin in West Asia, 8,000–14,000 years ago, via natural interspecific hybridization. Subsequently, new crop types evolved through spontaneous gene mutations and introgressions along three independent routes of eastward expansion. Selective sweeps, genome-wide trait associations and tissue-specific RNA-sequencing analysis shed light on the domestication history of flowering time and seed weight, and on human selection for morphological diversification in this versatile species. Our data provide a comprehensive insight into the origin and domestication and a foundation for genomics-based breeding of B. juncea.
Funder
National Natural Science Foundation of China
Education Department of Hunan Province
Ministry of Science and Technology of the People’s Republic of China
National Science Foundation
Publisher
Springer Science and Business Media LLC
Reference123 articles.
1. Vaughan, J. G. & Hemingway, J. S. The utilization of mustards. Econ. Bot. 13, 196–204 (1959).
2. Nagaharu, U. Genomic analysis in Brassica with special reference to the experimental formation of B. napus and peculiar mode of fertilization. Jpn. J. Bot. 7, 389–452 (1935).
3. Gladis, T. & Hammer, K. The Brassica collection in Gatersleben: Brassica juncea, Brassica napus, Brassica nigra and Brassica rapa. Feddes Rep. 103, 469–507 (1992).
4. Spect, C. E. & Diederichsen, A. Brassica in Mansfeld’s Encyclopedia of Agricultural and Horticultural Crops (ed. Hanelt, P.) 3, 1453–1456 (Springer Press, 2001).
5. Dixon, G. R. Origins and Diversity of Brassica and its relatives in Vegetable Brassicas and Related Crucifers (ed. Dixon, G.R.) 1–34 (CABI Press, 2007).
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