Population genomics of Zea species identifies selection signatures during maize domestication and adaptation.

Autor: Xu G; State Key Laboratory of Plant Physiology and Biochemistry, National Maize Improvement Center of China, MOA Key Laboratory of Maize Biology, China Agricultural University, Beijing, 100193, China.; Joint International Research Laboratory of Crop Molecular Breeding, China Agricultural University, Beijing, 100193, China., Zhang X; State Key Laboratory of Plant Physiology and Biochemistry, National Maize Improvement Center of China, MOA Key Laboratory of Maize Biology, China Agricultural University, Beijing, 100193, China.; Joint International Research Laboratory of Crop Molecular Breeding, China Agricultural University, Beijing, 100193, China., Chen W; State Key Laboratory of Plant Physiology and Biochemistry, National Maize Improvement Center of China, MOA Key Laboratory of Maize Biology, China Agricultural University, Beijing, 100193, China.; Joint International Research Laboratory of Crop Molecular Breeding, China Agricultural University, Beijing, 100193, China., Zhang R; State Key Laboratory of Plant Physiology and Biochemistry, National Maize Improvement Center of China, MOA Key Laboratory of Maize Biology, China Agricultural University, Beijing, 100193, China.; Joint International Research Laboratory of Crop Molecular Breeding, China Agricultural University, Beijing, 100193, China., Li Z; State Key Laboratory of Plant Physiology and Biochemistry, National Maize Improvement Center of China, MOA Key Laboratory of Maize Biology, China Agricultural University, Beijing, 100193, China.; Joint International Research Laboratory of Crop Molecular Breeding, China Agricultural University, Beijing, 100193, China., Wen W; Key Laboratory of Horticultural Plant Biology (MOE), College of Horticulture and Forestry Sciences, Huazhong Agricultural University, Wuhan, 430070, China., Warburton ML; United States of Department of Agriculture, Agricultural Research Service, Corn Host Plant Resistance Research Unit, Box 9555, Mississippi, MS, 39762, USA., Li J; State Key Laboratory of Plant Physiology and Biochemistry, National Maize Improvement Center of China, MOA Key Laboratory of Maize Biology, China Agricultural University, Beijing, 100193, China., Li H; Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing, 100081, China. lihuihui@caas.cn., Yang X; State Key Laboratory of Plant Physiology and Biochemistry, National Maize Improvement Center of China, MOA Key Laboratory of Maize Biology, China Agricultural University, Beijing, 100193, China. yxiaohong@cau.edu.cn.; Joint International Research Laboratory of Crop Molecular Breeding, China Agricultural University, Beijing, 100193, China. yxiaohong@cau.edu.cn.
Jazyk: angličtina
Zdroj: BMC plant biology [BMC Plant Biol] 2022 Feb 18; Vol. 22 (1), pp. 72. Date of Electronic Publication: 2022 Feb 18.
DOI: 10.1186/s12870-022-03427-w
Abstrakt: Background: Maize (Zea mays L. ssp. mays) was domesticated from teosinte (Zea mays ssp. parviglumis) about 9000 years ago in southwestern Mexico and adapted to a range of environments worldwide. Researchers have depicted the maize domestication and adaptation processes over the past two decades, but efforts have been limited either in sample size or genetic diversity. To better understand these processes, we conducted a genome-wide survey of 982 maize inbred lines and 190 teosinte accessions using over 40,000 single-nucleotide polymorphism markers.
Results: Population structure, principal component analysis, and phylogenetic trees all confirmed the evolutionary relationship between maize and teosinte, and determined the evolutionary lineage of all species within teosinte. Shared haplotype analysis showed similar levels of ancestral alleles from Zea mays ssp. parviglumis and Zea mays ssp. mexicana in maize. Scans for selection signatures identified 394 domestication sweeps by comparing wild and cultivated maize and 360 adaptation sweeps by comparing tropical and temperate maize. Permutation tests revealed that the public association signals for flowering time were highly enriched in the domestication and adaptation sweeps. Genome-wide association study identified 125 loci significantly associated with flowering-time traits, ten of which identified candidate genes that have undergone selection during maize adaptation.
Conclusions: In this study, we characterized the history of maize domestication and adaptation at the population genomic level and identified hundreds of domestication and adaptation sweeps. This study extends the molecular mechanism of maize domestication and adaptation, and provides resources for basic research and genetic improvement in maize.
(© 2022. The Author(s).)
Databáze: MEDLINE
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