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Identification of the Potential Genes Regulating Seed Germination Speed in Maize

文献类型： 外文期刊

作者： Zhang, Huairen 1 ; Zang, Jie 1 ; Huo, Yanqing 1 ; Zhang, Zhaogui 1 ; Chen, Huabang 1 ; Chen, Xunji 2 ; Liu, Juan 1 ;

作者机构： 1.Chinese Acad Sci, Innovat Acad Seed Design, State Key Lab Plant Cell & Chromosome Engn, Inst Genet & Dev Biol, Beijing 100101, Peoples R China

2.Xinjiang Acad Agr Sci, Inst Biotech & Nucl, Urumqi 830091, Peoples R China

关键词： maize; seed germination; divergent germination speed; time-series transcriptome; GWAS mapping

期刊名称：PLANTS-BASEL （ 影响因子：4.658； 五年影响因子：4.827 ）

ISSN：

年卷期： 2022 年 11 卷 4 期

页码：

收录情况： SCI

摘要： Seed germination is the crucial stage in plant life cycle. Rapid and uniform germination plays an essential role in plant development and grain yield improvement. However, the molecular mechanism underlying seed germination speed is largely unknown due to the complexity of the dynamic process and the difficulty in phenotyping. Here, we conducted a time-series comparative transcriptome study of two elite maize inbred lines, 72-3 and F9721, with striking difference in seed germination speed, and identified a major locus underlying maize germination speed through genome-wide association analysis (GWAS) of an F-2 segregation population. Comparative transcriptome study identified 12 h after imbibition (HAI) as the critical stage responsible for the variation in germination speed. The differentially expressed genes (DEGs) between 72-3 and F9721 were mainly enriched in metabolic pathways, biosynthesis of secondary metabolites, oxidoreductase activity pathways, hormone signal transduction, and amino acid transporter activity pathways. GWAS revealed that germination speed was controlled by a major locus on chromosome 1 with the leading SNP as AX-91332814, explaining 10.63% of phenotypic variation. A total of 87 proposed protein-coding genes surrounding the locus were integrated with DEGs. Combined with evidence from the gene expression database and gene synteny with other model species, we finally anchored three genes as the likely candidates regulating germination speed in maize. This study provides clues for the further exploration of genes controlling the maize seed germination speed, thus facilitating breeding of rapid germinated elite lines through marker assistant selection.

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