QTL Mapping and Analysis of Heading Date Based on a SNP Genetic Map in Rice

doi:10.3969/j.issn.1006-8082.2026.06.010

Abstract

Abstract:

Heading date is one of the key agronomic traits in rice, and in-depth mining of heading date-related QTLs/genes is of great significance for breeding widely adaptable, high-yielding rice varieties. In this study, a recombinant inbred line (RIL) population derived from a cross between japonica rice M494 and indica rice Zhong 9B (Z9B) was used, together with a high-density Bin genetic map. Over two years of trials, six QTLs controlling heading date were detected, located on chromosomes 1, 2, 8, and 10, and named qHD1-1, qHD1-2, qHD2, qHD8, qHD10-1, and qHD10-2. The LOD values of these QTLs ranged from 2.82 to 11.86, and the phenotypic variance explained by each QTL ranged from 4.03% to 18.33%. Among them, qHD8 had the highest contribution rate (18.33%), suggesting the presence of as-yet-unidentified heading date-related genes within its interval; qHD10-1 was identified as an allele of the known heading date gene Ehd1; and qHD10-2 represents a newly discovered QTL regulating heading date. These findings provide a theoretical basis and important genetic resources for further fine mapping and cloning of heading date genes, as well as for marker-assisted selection aimed at improving heading date in rice breeding.

Key words: rice, heading date, QTL

摘要：

抽穗期是水稻重要的农艺性状之一，深入挖掘与抽穗期相关的QTL/基因，对培育广适、高产水稻新品种具有重要意义。本研究以粳稻M494与籼稻中9B（Z9B）杂交构建的重组自交系（RIL）群体为基础，结合高密度Bin遗传图谱，在两年试验中共检测到6个控制抽穗期的QTL，分别定位于1、2、8和10号染色体，命名为qHD1-1、qHD1-2、qHD2、qHD8、qHD10-1和qHD10-2。分析表明，各QTL的LOD值在2.82~11.86之间，单个QTL可解释的表型变异贡献率为4.03%~18.33%。其中，qHD8的表型贡献率最高（18.33%），其区间内可能存在尚未被挖掘的抽穗期相关基因；qHD10-1为已知抽穗期基因Ehd1的等位基因；qHD10-2则为新发现的抽穗期调控QTL位点。上述研究结果为进一步开展水稻抽穗期基因的精细定位与克隆，以及利用分子标记辅助选择进行抽穗期改良提供了理论依据与重要基因资源。

关键词: 水稻, 抽穗期, QTL

CLC Number:

S511

HE Yuxuan, WANG Zhaojun, JIA Jinyan, XU Qun, ZHANG Mengchen, WANG Shan, SUN Yanfei, YANG Yaolong, LI Hongyu, FENG Yue. QTL Mapping and Analysis of Heading Date Based on a SNP Genetic Map in Rice[J]. China Rice, 2026, 32(6): 68-74.

何雨宣, 王召君, 贾金艳, 徐群, 章孟臣, 王珊, 孙燕飞, 杨窑龙, 李红宇, 冯跃. 基于SNP遗传图谱的水稻抽穗期QTL定位与分析[J]. 中国稻米, 2026, 32(6): 68-74.

Figures/Tables 8

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