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Identification and candidate gene mining of HvSS1, a novel qualitative locus on chromosome 6H, regulating the uppermost internode elongation in barley (Hordeum vulgare L.)

文献类型： 外文期刊

作者： Pu, Xi 1 ; Tang, Yanyan 1 ; Zhang, Meihao 1 ; Li, Tao 1 ; Qiu, Xvebing 1 ; Zhang, Juanyu 1 ; Wang, Jinhui 1 ; Li, Lilan 1 ;

作者机构： 1.Chinese Acad Sci, Chengdu Inst Biol, Chengdu 610041, Sichuan, Peoples R China

2.Univ Chinese Acad Sci, Beijing, Peoples R China

3.Tibet Acad Agr & Anim Husb Sci, Lhasa, TN, Peoples R China

期刊名称：THEORETICAL AND APPLIED GENETICS （ 影响因子：4.439； 五年影响因子：4.603 ）

ISSN： 0040-5752

年卷期：

页码：

收录情况： SCI

摘要： Key message A novel qualitative locus regulating the uppermost internode elongation of barley was identified and mapped on 6H, and the candidate gene mining was performed by employing various barley genomic resources. The stem of grass crops, such as barley and wheat, is composed of several interconnected internodes. The extent of elongation of these internodes determines stem height, and hence lodging, canopy architecture, and grain yield. The uppermost internode (UI) is the last internode to elongate. Its elongation contributes largely to stem height and facilitates spike exsertion, which is crucial for final grain yield. Despite the molecular mechanism underlying regulation of UI elongation was extensively investigated in rice, little is known in barley. In this study, we characterized a barley spontaneous mutant, Sheathed Spike 1 (SS1), showing significantly shortened UI and sheathed spike (SS). The extension of UI parenchyma cell in SS1 was significantly suppressed. Exogenous hormone treatments and RNA-seq analysis indicated that the suppression of UI elongation is possibly related to insufficient content of endogenous bioactive gibberellin. Genetic analysis showed that SS1 is possibly controlled by a qualitative dominant nuclear factor. Bulked segregant analysis and further molecular marker mapping identified a novel major locus, HvSS1, in a recombination cold spot expanding 173.44-396.33 Mb on chromosome 6H. The candidate gene mining was further conducted by analyzing sequence differences, spatiotemporal expression patterns, and variant distributions of genes in the candidate interval by employing various barley genomic resources of worldwide collections of barley accessions. This study made insight into genetic control of UI elongation in barley and laid a solid foundation for further gene cloning and functional characterization. The results obtained here also provided valuable information for similar research in wheat.

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