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Identification, Fine Mapping and Application of Quantitative Trait Loci for Grain Shape Using Single-Segment Substitution Lines in Rice (Oryza sativa L.)

文献类型： 外文期刊

作者： Wang, Xiaoling 1 ; Li, Xia 1 ; Luo, Xin 1 ; Tang, Shusheng 1 ; Wu, Ting 1 ; Wang, Zhiquan 1 ; Peng, Zhiqin 1 ; Xia, Qiyu 3 ; Yu, Chuanyuan 1 ; Xiao, Yulong 1 ;

作者机构： 1.Jiangxi Acad Agr Sci, Rice Res Inst, Natl Engn Res Ctr Rice Nanchang, Nanchang 330200, Peoples R China

2.South China Agr Univ, Coll Agr, Guangdong Prov Key Lab Plant Mol Breeding, Guangzhou 510642, Peoples R China

3.Chinese Acad Trop Agr Sci, Inst Trop Biosci & Biotechnol, San Ya Res Inst, Hainan Key Lab Biosafety Monitoring & Mol Breeding, Haikou 571101, Peoples R China

关键词： rice; grain shape; quantitative trait locus (QTL); single-segment substitution line (SSSL)

期刊名称：PLANTS-BASEL （ 影响因子：4.5； 五年影响因子：4.8 ）

ISSN：

年卷期： 2023 年 12 卷 4 期

页码：

收录情况： SCI

摘要： Quantitative trait loci (QTLs) and HQTL (heterosis QTLs) for grain shape are two major genetic factors of grain yield and quality in rice (Oryza sativa L.). Although many QTLs for grain shape have been reported, only a few are applied in production. In this study, 54 QTLs for grain shape were detected on 10 chromosomes using 33 SSSLs (single-segment substitution lines) and methods of statistical genetics. Among these, 23 exhibited significant positive additive genetic effects, including some novel QTLs, among which qTGW4-(1,2), qTGW10-2, and qTGW10-3 were three QTLs newly found in this study and should be paid more attention. Moreover, 26 HQTLs for grain shape were probed. Eighteen of these exhibited significant positive dominant genetic effects. Thirty-three QTLs for grain shape were further mapped using linkage analysis. Most of the QTLs for grain shape produced pleiotropic effects, which simultaneously controlled multiple appearance traits of grain shape. Linkage mapping of the F-2 population derived from sub-single-segment substitution lines further narrowed the interval harbouring qTGW10-3 to 75.124 kb between PSM169 and RM25753. The candidate gene was identified and could be applied to breeding applications by molecular marker-assisted selection. These identified QTLs for grain shape will offer additional insights for improving grain yield and quality in rice breeding.

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