Effects of five allelic variants of the wheat vernalization gene VRN-B1 on heading date and vernalization requirements
文献类型： 外文期刊
作者： Song, Tianqi 1 ; Fan, Qiru 1 ; Shi, Caiyin 1 ; Li, Siyi 1 ; Zhou, Jianfei 1 ; Bu, Yaning 1 ; Chang, Xiling 1 ; Yu, Yang 1 ; Lei, Xinpeng 1 ; Wang, Yuxin 1 ; Chen, Dongsheng 3 ; Xiang, Jishan 2 ; Zhang, Xiaoke 1 ;
作者机构： 1.Northwest A&F Univ, Coll Agron, Yangling 712100, Shaanxi, Peoples R China
2.Yili Normal Univ, Coll Biol Sci & Technol, Yili 830500, Xinjiang, Peoples R China
3.Ningxia Acad Agr & Forestry Sci, Crop Res Inst, Yinchuan 750002, Ningxia, Peoples R China
4.Yili Normal Univ, Xinjiang Key Lab Lavender Conservat & Utilizat, Yili 830500, Xinjiang, Peoples R China
关键词： Wheat; Heading date; Vernalization requirements; VRN-B1; Allelic variation
期刊名称：MOLECULAR BREEDING （ 影响因子：3.0； 五年影响因子：3.0 ）
ISSN： 1380-3743
年卷期： 2025 年 45 卷 4 期
页码：
收录情况： SCI
摘要： Winter wheat must undergo vernalization to flower, while spring wheat does not require vernalization. The requirement for vernalization in wheat is primarily controlled by vernalization genes. VRN-1 are the most important vernalization genes. The recessive vrn-1 alleles have a strict vernalization requirement, while dominant mutations in Vrn-1 eliminate or reduce this requirement. In this study, the near-isogenic lines for several VRN-B1 allelic variants (Vrn-B1a, Vrn-B1b, Vrn-B1c, Vrn-B1 d and vrn-B1) were generated in two winter wheat backgrounds. Under field conditions, the four dominant Vrn-B1 allelic variants (Vrn-B1a, Vrn-B1b, Vrn-B1c, and Vrn-B1 d) resulted in an advancement in the heading date by 3-5 days. Using an artificially controlled gradient vernalization treatment (4-5 degrees C, ranging from 0 to 45 days with 5-day intervals), the vernalization requirements of VRN-B1 allelic variants were analyzed. The relative effects on vernalization requirements were found to be vrn-B1 > Vrn-B1a = Vrn-B1 d > Vrn-B1b = Vrn-B1c (opposite to the heading date). Gene expression analysis indicates that the earlier heading associated with the dominant Vrn-B1 allelic variants is linked to their open expression under non-vernalization conditions. There may be an expression threshold at the VRN-B1 locus that eliminates the vernalization requirement, and this threshold should be lower than the vrn-B1 levels observed under saturated vernalization conditions. Furthermore, once this hypothesized threshold is reached, there appears to be no dosage effect on VRN-B1 expression. These results deepen our understanding of wheat vernalization genes and provide a theoretical basis for utilizing these genes in breeding programs aimed at improving wheat adaptability.
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