数字农科院2.0

Linkage mapping combined with GWAS revealed the genetic structural relationship and candidate genes of maize flowering time-related traits

文献类型： 外文期刊

作者： Jian Shi;Yunhe Wang;Chuanhong Wang;Lei Wang;Wei Zeng;Guomin Han;Chunhong Qiu;Tengyue Wang;Zhen Tao;Kaiji Wang;Shijie Huang;Shuaishuai Yu;Wanyi Wang;Hongyi Chen;Chen Chen;Chen He;Hui Wang;Peiling Zhu;Yuanyuan Hu;Xin Zhang;Chuanxiao Xie

作者机构：

关键词： Candidate gene;Flowering time;Genome-wide association study;Maize;Quantitative trait locus

期刊名称： BMC plant biology

ISSN： 1471-2229

年卷期： 2022 年 22.0 卷 1 期

页码：

收录情况： SCIE（2022版）

摘要： BACKGROUND: Flowering time is an important agronomic trait of crops and significantly affects plant adaptation and seed production. Flowering time varies greatly among maize (Zea mays) inbred lines, but the genetic basis of this variation is not well understood. Here, we report the comprehensive genetic architecture of six flowering time-related traits using a recombinant inbred line (RIL) population obtained from a cross between two maize genotypes, B73 and Abe2, and combined with genome-wide association studies to identify candidate genes that affect flowering time. RESULTS: Our results indicate that these six traits showed extensive phenotypic variation and high heritability in the RIL population. The flowering time of this RIL population showed little correlation with the leaf number under different environmental conditions. A genetic linkage map was constructed by 10,114 polymorphic markers covering the whole maize genome, which was applied to QTL mapping for these traits, and identified a total of 82 QTLs that contain 13 flowering genes. Furthermore, a combined genome-wide association study and linkage mapping analysis revealed 17 new candidate genes associated with flowering time. CONCLUSIONS: In the present study, by using genetic mapping and GWAS approaches with the RIL population, we revealed a list of genomic regions and candidate genes that were significantly associated with flowering time. This work provides an important resource for the breeding of flowering time traits in maize.

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