Population genomic and genome-wide association analysis of lignin content in a global collection of 206 forage sorghum accessions
文献类型： 外文期刊
作者： Niu, Hao 1 ; Ping, Junai 2 ; Wang, Yubin 2 ; Lv, Xin 2 ; Li, Huiming 2 ; Zhang, Fuyao 2 ; Chu, Jianqiang 2 ; Han, Yuanhua 1 ;
作者机构： 1.Shanxi Agr Univ, Coll Agr, Taigu 030801, Peoples R China
2.Shanxi Agr Univ, Shanxi Acad Agr Sci, Sorghum Inst, Jinzhong 030600, Peoples R China
3.Shanxi Key Lab Sorghum Genet & Germplasm Innovat, Jinzhong 030600, Peoples R China
4.Minist Agr, Key Lab Crop Gene Resources & Germplasm Enhanceme, Taiyuan 030031, Peoples R China
关键词： Sorghum bicolor; Quantitative trait locus; Lignin content; Genome-wide association studies
期刊名称：MOLECULAR BREEDING （ 影响因子：2.589； 五年影响因子：2.75 ）
ISSN： 1380-3743
年卷期： 2020 年 40 卷 8 期
页码：
收录情况： SCI
摘要： Forage sorghum (Sorghum bicolor(L.) Moench) is a wildly cultivated C4 cereal crop in many geographical regions and differs among germplasms in a number of important physiological traits. Lignin is a complex heteropolymer found in plant cell walls that adversely affects economic and environmental benefits of the crop. To understand the genetic basis, we re-sequenced the genomes of 206 sorghum accessions collected around the globe and identified 14,570,430 SNPs and 1,967,033 indels. Based on the SNP markers, we characterized the population structure and identified loci underlying lignin content by genome-wide association studies (GWAS). Analysis of the genetic relationships among the accessions revealed a more diverse spread of sorghum accessions and breeding lines from Asia, America, and their genetically improved variety, but a limited genetic diversity in the European accessions. These findings add new perspectives to the historical processes of crop diffusion within and across agroclimatic zones of America, Asia, and Europe. GWAS revealed 9 quantitative trait loci (QTLs) for lignin content, harboring 184 genes. These genes were significantly enriched into 7 major gene ontology (GO) terms involved in plant-type cell wall organization or bioenergy. The alleles of 9 QTLs in the 206 accessions were geographically distributed. The findings provide us with an understanding of the origin and spread of haplotypes linked to lignin content. The findings will allow improvements to feed quality and adaptation to stresses in sorghum, through the rapid increase of genetic gains for lignin content.
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