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Genome-Wide Association Study Reveals Marker-Trait Associations for Heat-Stress Tolerance in Sweet Corn

文献类型： 外文期刊

作者： Yang, Quannv 1 ; Guo, Zifeng 3 ; Zhang, Jianan 4 ; Wang, Yunbo 2 ; Xu, Yunbi 3 ; Nian, Hai 1 ;

作者机构： 1.South China Agr Univ, Coll Agr, Key Lab Plant Mol Breeding Guangdong Prov, Guangzhou 510642, Peoples R China

2.Foshan Univ, China Trop Maize Res Ctr, Sch Food Sci & Engn, CIMMYT, Foshan 528225, Guangdong, Peoples R China

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

4.MolBreeding Biotechnol Co Ltd, Shijiazhuang 050035, Peoples R China

5.Peking Univ, Inst Adv Agr Sci, Weifang 261325, Peoples R China

6.BGI Bioverse, Shenzhen 518083, Peoples R China

关键词： heat resistance; GWAS; associated SNPs; candidate genes; hsp

期刊名称：AGRONOMY-BASEL （ 影响因子：3.4； 五年影响因子：3.8 ）

ISSN：

年卷期： 2024 年 14 卷 9 期

页码：

收录情况： SCI

摘要： Sweet corn (Zea mays var. rugosa Bonaf.) is a crop with a high economic benefit in tropical and subtropical regions. Heat tolerance analysis and heat-tolerant gene mining are of great significance for breeding heat-resistant varieties. By combining improved genotyping using targeted sequencing (GBTS) with liquid chip (LC) technology, a high-density marker array containing 40 K multiple single polynucleotide polymorphisms (mSNPs) was used to genotype 376 sweet corn inbred lines and their heat-stress tolerance was evaluated in the spring and summer of 2019. In general, plant height, ear height and the number of lateral branches at the first level of the male flowers were reduced by 24.0%, 36.3%, and 19.8%, respectively. High temperatures in the summer accelerated the growth process of the sweet corn, shortening the days to shedding pollen by an average of 21.6% compared to the spring. A genome-wide association study (GWAS) identified 85 significant SNPs distributed on 10 chromosomes. Phenotypes in the spring and summer were associated with the 21 and 15 loci, respectively, and significant phenotypic differences between the two seasons caused by the temperature change were associated with the 49 SNP loci. The seed setting rate (SSR) was more susceptible to heat stress. An annotation analysis identified six candidate genes, which are either heat shock transcription factors (Hsfs) or heat shock proteins (Hsps) in Arabidopsis and rice (Oryza sativa), and these candidate genes were directly and indirectly involved in the heat-resistant response in the sweet corn. The current findings provide genetic resources for improving the heat-stress tolerance of sweet corn by molecular breeding.

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