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GWAS of grain color and tannin content in Chinese sorghum based on whole-genome sequencing

文献类型： 外文期刊

作者： Zhang, Liyi 1 ; Xu, Jianxia 1 ; Ding, Yanqing 1 ; Cao, Ning 1 ; Gao, Xu 1 ; Feng, Zhou 1 ; Li, Kuiying 3 ; Cheng, Bing 1 ; Zhou, Lengbo 1 ; Ren, Mingjian 3 ; Tao, Yuezhi 2 ; Zou, Guihua 2 ;

作者机构： 1.Guizhou Acad Agr Sci, Guizhou Inst Upland Crops, Guiyang 550006, Peoples R China

2.Zhejiang Acad Agr Sci, Inst Crop & Nucl Technol Utilizat, Zhejiang Key Lab Digital Dry Land Crops, Hangzhou 310021, Peoples R China

3.Guizhou Univ, Coll Agr, Guiyang 550025, Peoples R China

期刊名称：THEORETICAL AND APPLIED GENETICS （ 影响因子：5.4； 五年影响因子：5.7 ）

ISSN： 0040-5752

年卷期： 2023 年 136 卷 4 期

页码：

收录情况： SCI

摘要： Sorghum is mainly used for brewing distilled liquors in China. Since grain tannins play an important role in liquor brewing, accurately understanding the relationship between grain color and tannin content can provide basis for selection standards of tannin sorghum. We resequenced a panel of 242 Chinese sorghum accessions and performed population structure and genome-wide association study (GWAS) to identify quantitative trait locus (QTL) affecting pericarp color, testa pigment, and tannin content. Phylogenetic analysis, principal component analysis (PCA), and admixture model were used to infer population structure. Two distinct genetic sub-populations were identified according to their corresponding northern and southern geographic origin. To investigate the genetic basis of natural variation in sorghum grain color, GWAS with 2,760,264 SNPs was conducted in four environments using multiple models (Blink, FarmCPU, GLM, and MLM). Seventy-three QTL were identified to be associated for the color of exocarp, mesocarp, testa, and tannin content on all chromosomes except chromosome 5, of which 47 might be novel QTL. Some important QTL were found to colocalize with orthologous genes in the flavonoid biosynthetic pathway from other plants, including orthologous of Arabidopsis (Arabidopsis thaliana) TT2, TT7, TT12, TT16 and AT5G41220 (GST), as well as orthologous of rice (Oryza sativa) MYB61 and OsbHLH025. Our investigation of the variation in grain color and tannin content in Chinese sorghum germplasm may help guide future sorghum breeding for liquor brewing.

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