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Genome-wide association study and genomic prediction of Fusarium ear rot resistance in tropical maize germplasm

文献类型： 外文期刊

作者： Liu, Yubo 1 ; Hu, Guanghui 2 ; Zhang, Ao 2 ; Loladze, Alexander 2 ; Hu, Yingxiong 2 ; Wang, Hui 2 ; Qu, Jingtao 7 ; Zhang 1 ;

作者机构： 1.Shenyang Agr Univ, Coll Agron, Shenyang 110866, Liaoning, Peoples R China

2.Int Maize & Wheat Improvement Ctr CIMMYT, El Batan, Texcoco, Mexico

3.Shenyang Agr Univ, Coll Biol Sci & Technol, Shenyang 110866, Liaoning, Peoples R China

4.Heilongjiang Acad Agr Sci, Maize Res Inst, Harbin 150086, Heilongjiang, Peoples R China

5.Shanghai Acad Agr Sci, CIMMYT China Specialty Maize Res Ctr, Shanghai 200063, Peoples R China

6.Shanghai Acad Agr Sci, Crop Breeding & Cultivat Res Inst, Shanghai 200063, Peoples R China

7.Sichuan Agr Univ, Maize Res Inst, Wenjiang 611130, Sichuan, Peoples R China

8.Int Maize & Wheat Improvement Ctr CIMMYT, POB 1041, Nairobi 00621, Kenya

关键词： Maize; Fusarium ear rot; Genome-wide association study; Genomic prediction; Genomic selection

期刊名称：CROP JOURNAL （ 影响因子：3.395； ）

ISSN： 2095-5421

年卷期： 2021 年 9 卷 2 期

页码：

收录情况： SCI

摘要： Fusarium ear rot (FER) is a destructive maize fungal disease worldwide. In this study, three tropical maize populations consisting of 874 inbred lines were used to perform genome-wide association study (GWAS) and genomic prediction (GP) analyses of FER resistance. Broad phenotypic variation and high heritability for FER were observed, although it was highly influenced by large genotype-by-environment interactions. In the 874 inbred lines, GWAS with general linear model (GLM) identified 3034 single-nucleotide polymorphisms (SNPs) significantly associated with FER resistance at the P-value threshold of 1 x 10(-5), the average phenotypic variation explained (PVE) by these associations was 3% with a range from 2.33% to 6.92%, and 49 of these associations had PVE values greater than 5%. The GWAS analysis with mixed linear model (MLM) identified 19 significantly associated SNPs at the P-value threshold of 1 x 10(-4), the average PVE of these associations was 1.60% with a range from 1.39% to 2.04%. Within each of the three populations, the number of significantly associated SNPs identified by GLM and MLM ranged from 25 to 41, and from 5 to 22, respectively. Overlapping SNP associations across populations were rare. A few stable genomic regions conferring FER resistance were identified, which located in bins 3.04/05, 7.02/04, 9.00/01, 9.04, 9.06/07, and 10.03/04. The genomic regions in bins 9.00/01 and 9.04 are new. GP produced moderate accuracies with genome-wide markers, and relatively high accuracies with SNP associations detected from GWAS. Moderate prediction accuracies were observed when the training and validation sets were closely related. These results implied that FER resistance in maize is controlled by minor QTL with small effects, and highly influenced by the genetic background of the populations studied. Genomic selection (GS) by incorporating SNP associations detected from GWAS is a promising tool for improving FER resistance in maize. (C) 2020 Crop Science Society of China and Institute of Crop Science, CAAS. Production and hosting by Elsevier B.V. on behalf of KeAi Communications Co., Ltd.

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