Genomic insights into the origin, domestication and diversification of Brassica juncea.
Nat Genet
; 53(9): 1392-1402, 2021 09.
Article
in En
| MEDLINE
| ID: mdl-34493868
ABSTRACT
Despite 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.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Chromosomes, Plant
/
Biological Evolution
/
Plant Breeding
/
Domestication
/
Mustard Plant
Language:
En
Journal:
Nat Genet
Journal subject:
GENETICA MEDICA
Year:
2021
Type:
Article
Affiliation country:
China