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QTL analysis across multiple environments reveals promising chromosome regions associated with yield-related traits in maize under drought conditions

文献类型： 外文期刊

作者： Hu, Xinmin 1 ; Wang, Guihua 1 ; Du, Xuemei 1 ; Zhang, Hongwei 3 ; Xu, Zhenxiang 1 ; Wang, Jie 1 ; Chen, Guo 4 ; Wang, Bo; 1 ;

作者机构： 1.China Agr Univ, Coll Agron & Biotechnol, Beijing Innovat Ctr Crop Seed Technol,Minist Educ, Minist Agr & Rural Affairs,Key Lab Crop Heterosis, Beijing 100193, Peoples R China

2.China Agr Univ, Coll Agron & Biotechnol, Beijing Key Lab Crop Genet Improvement,Minist Edu, Minist Agr & Rural Affairs,Key Lab Crop Heterosis, Beijing 100193, Peoples R China

3.Chinese Acad Agr Sci, Inst Crop Sci, Beijing 100081, Peoples R China

4.Xinjiang Acad Agr Sci, Inst Nucl Technol & Biotechnol, Urumqi 830091, Xinjiang, Peoples R China

关键词： Drought; Yield; Quantitative trait locus; Introgression; Maize

期刊名称：CROP JOURNAL （ 影响因子：4.407； 五年影响因子：5.687 ）

ISSN： 2095-5421

年卷期： 2021 年 9 卷 4 期

页码：

收录情况： SCI

摘要： Drought is one of the most critical abiotic stresses influencing maize yield. Improving maize cultivars with drought tolerance using marker-assisted selection requires a better understanding of its genetic basis. In this study, a doubled haploid (DH) population consisting of 217 lines was created by crossing the inbred lines Han 21 (drought-tolerant) and Ye 478 (drought-sensitive). The population was geno-typed with a 6 K SNP assay and 756 SNP (single nucleotide polymorphism) markers were used to construct a linkage map with a length of 1344 cM. Grain yield (GY), ear setting percentage (ESP), and anthesis-silking interval (ASI) were recorded in seven environments under well-watered (WW) and water-stressed (WS) regimes. High phenotypic variation was observed for all traits under both water regimes. Using the LSMEAN (least-squares mean) values from all environments for each trait, 18 QTL were detected, with 9 associated with the WW and 9 with the WS regime. Four chromosome regions, Chr. 3: 219.8-223.7 Mb, Chr. 5: 191.5-194.7 Mb, Chr. 7: 132.2-135.6 Mb, and Chr. 10: 88.2-89.4 Mb, harbored at least 2 QTL in each region, and QTL co-located in a region inherited favorable alleles from the same parent. A set of 64 drought-tolerant BC3F6 lines showed preferential accumulation of the favorable alleles in these four regions, supporting an association between the four regions and maize drought tolerance. QTL-by-environment interaction analysis revealed 28 edQTL (environment-dependent QTL) associated with the WS regime and 22 associated with the WW regime for GY, ESP, and ASI. All WS QTL and 55.6% of WW QTL were located in the edQTL regions. The hotspot genomic regions identified in this work will support further fine mapping and marker-assisted breeding of drought-tolerant maize. (C) 2021 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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