期刊
MOLECULAR PLANT
卷 13, 期 9, 页码 1250-1261出版社
CELL PRESS
DOI: 10.1016/j.molp.2020.07.003
关键词
alfalfa; genome assembly; population genetics; GWAS; Flowering Locus T
资金
- National Key Research & Development Program of China [2019YFD1002701]
- Agricultural Variety Improvemnt Project of Shandong Province [2019LZGC010]
- Project for Extramural Scientists of the State Key Laboratory for Agrobiotechnology [2020SKLAB6-15, 2011SKLAB01-1]
Alfalfa (Medicago sativa) is one of the most important forage crops in the world; however, its molecular genetics and breeding research are hindered due to the lack of a high-quality reference genome. Here, we report a de novo assembled 816-Mb high-quality, chromosome-level haploid genome sequence for 'Zhongmu No.1' alfalfa, a heterozygous autotetraploid. The contig N50 is 3.92 Mb, and 49 165 genes are annotated in the genome. The alfalfa genome is estimated to have diverged from M. truncatula approximately 8 million years ago. Genomic population analysis of 162 alfalfa accessions revealed high genetic diversity, weak population structure, and extensive gene flow from wild to cultivated alfalfa. Genome-wide association studies identified many candidate genes associated with important agronomic traits. Furthermore, we showed that MsFTa2, a Flowering Locus T homolog, whose expression is upregulated in salt-resistant germplasms, may be associated with fall dormancy and salt resistance. Taken together, these genomic resources will facilitate alfalfa genetic research and agronomic improvement.
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