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Identification of QTL under Brassinosteroid-Combined Cold Treatment at Seedling Stage in Rice Using Genotyping-by-Sequencing (GBS)

文献类型： 外文期刊

作者： Guo, Zhifu 1 ; Yao, Jialu 1 ; Cheng, Yishan 1 ; Zhang, Wenzhong 2 ; Xu, Zhengjin 2 ; Li, Maomao 3 ; Huang, Jing 4 ; Ma, Dianrong 2 ; Zhao, Minghui 2 ;

作者机构： 1.Shenyang Agr Univ, Coll Biosci & Biotechnol, Key Lab Agr Biotechnol Liaoning Prov, Shenyang 110866, Peoples R China

2.Shenyang Agr Univ, Coll Agron, Rice Res Inst, Shenyang 110866, Peoples R China

3.Jiangxi Acad Agr Sci, Rice Res Inst, Nanchang 330200, Jiangxi, Peoples R China

4.Purdue Univ, Coll Agr, Dept Agron, W Lafayette, IN 47907 USA

关键词： rice; brassinosteroids; cold tolerance; QTL mapping; candidate genes

期刊名称：PLANTS-BASEL （ 影响因子：4.658； 五年影响因子：4.827 ）

ISSN：

年卷期： 2022 年 11 卷 17 期

页码：

收录情况： SCI

摘要： Cold stress is a major threat to the sustainability of rice yield. Brassinosteroids (BR) application can enhance cold tolerance in rice. However, the regulatory mechanism related to cold tolerance and the BR signaling pathway in rice has not been clarified. In the current study, the seedling shoot length (SSL), seedling root length (SRL), seedling dry weight (SDW), and seedling wet weight (SWW) were used as the indices for identifying cold tolerance under cold stress and BR-combined cold treatment in a backcross recombinant inbred lines (BRIL) population. According to the phenotypic characterization for cold tolerance and a high-resolution SNP genetic map obtained from the GBS technique, a total of 114 QTLs were identified, of which 27 QTLs were detected under cold stress and 87 QTLs under BR-combined cold treatment. Among them, the intervals of many QTLs were coincident under different treatments, as well as different traits. A total of 13 candidate genes associated with cold tolerance or BR pathway, such as BRASSINAZOLE RESISTANT1 (OsBZR1), OsWRKY77, AP2 domain-containing protein, zinc finger proteins, basic helix-loop-helix (bHLH) protein, and auxin-induced protein, were predicted. Among these, the expression levels of 10 candidate genes were identified under different treatments in the parents and representative BRIL individuals. These results were helpful in understanding the regulation relationship between cold tolerance and BR pathway in rice.

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