Identification and distribution of VERNALIZATION1 alleles in Chinese barley (Hordeum vulgare) germplasm

文献类型： 外文期刊

第一作者： Zhang, C. H.

作者： Zhang, C. H.;Xu, D. A.;Zhao, C. H.;Yu, M. Q.;Chen, J.;Qiang, X. L.;Zhang, J.

作者机构：

关键词： Hordeum vulgare;VERNALIZATION1;Molecular markers;Distribution

期刊名称：MOLECULAR BREEDING （ 影响因子：2.589； 五年影响因子：2.75 ）

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收录情况： SCI

摘要： VERNALIZATION1 (VRN1) is a central regulator of the vernalization requirement, which affects the yield and geographical distribution of Triticeae crops through regulation of the flowering time. The first intron (Intron I) of VRN1 contains putative cis-elements that mediate repression of VRN1 expression. Allelic variations in Intron I are closely associated with increased VRN1 expression in vernalization-responsive accessions in the absence of vernalization. In this study, diagnostic molecular markers were developed to distinguish the main 12 known alleles, including a new allele, of barley (Hordeum vulgare) VRN1 (HvVRN1), and to investigate HvVRN1 alleles in 373 barley varieties from major agroecological regions in China. The new allele, HvVRN1-11, with a 3172-bp deletion in Intron I of HvVRN1, was identified in a Chinese barley landrace. Analysis of eight polymorphic sites flanking major variations in Intron I of HvVRN1 classified the 12 HvVRN1 alleles into five distinct groups. Compared with modern commercial barley, landraces possessed greater genetic diversity and contained the majority of HvVRN1 alleles, especially in the winter barley regions. HvVRN1 diversity in terms of allele number reduced significantly (P < 0.01) along with higher growing latitudes, but increased in accessions carrying the winter HvVRN2 allele. Wild-type HvVRN1 and the HvVRN1-8 allele showed the most widespread distribution in most regions whereas HvVRN1-1 & HvVRN1-8, and HvVRN1-5 are predominant in the Inner Mongolian Plateau spring barley region and the Northeast Plain spring barley region, respectively, with relatively higher latitudes. Compared with landraces, the frequency of HvVRN1-8 decreased while wild-type HvVRN1 increased significantly (P < 0.01) in commercial varieties. Our study classified HvVRN1 genetic diversity in a large collection of Chinese germplasm and provided a tool for identifying HvVRN1 alleles in barley breeding populations.

分类号： Q94

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