数字农科院2.0

Gene Mapping and Identification of a Missense Mutation in One Copy of VRN-A1 Affects Heading Date Variation in Wheat

文献类型： 外文期刊

作者： Xue, Qianwen;Xiong, Hongchun;Zhou, Chunyun;Guo, Huijun;Zhao, Linshu;Xie, Yongdun;Gu, Jiayu;Zhao, Shirong;Ding, Yuping;Xu, Le;Liu, Luxiang

作者机构：

关键词： heading date;wheat;VRN-A1;genetic mapping;copy number

期刊名称： INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES

ISSN：

年卷期： 2023 年 24 卷 5 期

页码：

收录情况： SCIE（2023版）

摘要： Heading date (HD) is an important trait for wide adaptability and yield stability in wheat. The Vernalization 1 (VRN1) gene is a key regulatory factor controlling HD in wheat. The identification of allelic variations in VRN1 is crucial for wheat improvement as climate change becomes more of a threat to agriculture. In this study, we identified an EMS-induced late-heading wheat mutant je0155 and crossed it with wide-type (WT) Jing411 to construct an F-2 population of 344 individuals. Through Bulk Segregant Analysis (BSA) of early and late-heading plants, we identified a Quantitative Trait Locus (QTL) for HD on chromosome 5A. Further genetic linkage analysis limited the QTL to a physical region of 0.8 Mb. Cloning and sequencing revealed three copies of VRN-A1 in the WT and mutant lines; one copy contained a missense mutation of C changed to T in exon 4 and another copy contained a mutation in intron 5. Genotype and phenotype analysis of the segregation population validated that the mutations in VRN-A1 contributed to the late HD phenotype in the mutant. Expression analysis of C- or T-type alleles in exon 4 of the WT and mutant lines indicated that this mutation led to lower expression of VRN-A1, which resulted in the late-heading of je0155. This study provides valuable information for the genetic regulation of HD and many important resources for HD refinement in wheat breeding programs.

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