中国农业科学 ›› 2026, Vol. 59 ›› Issue (18): 3949-3972.doi: 10.3864/j.issn.0578-1752.2026.18.001

• 作物遗传育种·种质资源·分子遗传学 • 上一篇    下一篇

普通小麦旗叶大小QTL定位与候选基因分析

关攀锋1(), 李盟欣1, 万紫栋1, 葛帅1, 汪欣燕1, 崔东洁1, 池青1, 孙昊1, 马若男1, 李兵1, 许航博1, 张世洁1, 郭淑卿1, 卢家玲1, 焦浈1, 朱育攀1(), 魏文辉2()   

  1. 1 郑州大学农业与生物制造学院/河南省离子束绿色农业生物工程重点实验室, 郑州 450001
    2 昭通学院农学与生命科学学院, 云南昭通 657000
  • 收稿日期:2026-02-03 接受日期:2026-04-01 出版日期:2026-09-16 发布日期:2026-09-20
  • 通信作者:
    朱育攀,E-mail:
    魏文辉,E-mail:
  • 联系方式: 关攀锋,E-mail:guanpanfeng@zzu.edu.cn。
  • 基金资助:
    国家自然科学基金(32201862); 河南省科技攻关项目(242102111135)

QTL Mapping and Candidate Gene Analysis of Flag Leaf Size in Common Wheat (Triticum aestivum L.)

GUAN PanFeng1(), LI MengXin1, WAN ZiDong1, GE Shuai1, WANG XinYan1, CUI DongJie1, CHI Qing1, SUN Hao1, MA RuoNan1, LI Bing1, XU HangBo1, ZHANG ShiJie1, GUO ShuQing1, LU JiaLing1, JIAO Zhen1, ZHU YuPan1(), WEI WenHui2()   

  1. 1 School of Agriculture and Biomanufacturing, Zhengzhou University/Henan Key Laboratory of Ion-Beam Green Agriculture Bioengineering, Zhengzhou 450001
    2 College of Agronomy and Life Sciences, Zhaotong University, Zhaotong 657000, Yunnan
  • Received:2026-02-03 Accepted:2026-04-01 Published:2026-09-16 Online:2026-09-20

摘要:

【目的】小麦旗叶大小是株型结构的关键特征,对光合作用、产量形成和胁迫响应至关重要。挖掘调控旗叶大小相关性状的主效QTL与候选基因,为小麦理想株型高产分子设计育种提供理论支撑与基因资源。【方法】以我国骨干型品种百农4199(BN4199)为母本、国外引进材料郑引麦2号(ZYM2)为父本,构建包含184个家系的重组自交系(recombinant inbred line,RIL)群体,利用小麦120K液相芯片(120K-4HWA)进行基因分型,并构建高密度遗传连锁图谱;基于复合区间作图法(composite interval mapping,CIM),结合2年2点4个大田环境下旗叶大小相关性状(包括旗叶长度、宽度、长宽比及面积)的表型数据和最佳线性无偏估计(best linear unbiased estimate,BLUE)值,进行全基因组QTL定位,获得稳定主效QTL并分析其加性效应;同时,结合多个小麦功能基因组学研究数据库,开展候选基因筛选和鉴定,以及组织表达模式分析,并根据QTL区间多态性SNP位点开发相应的竞争性等位基因特异性PCR标记(kompetitive allele-specific PCR,KASP)。【结果】构建了BN4199/ZYM2-RIL群体的高密度遗传连锁图谱,包含27个连锁群,3 666个SNP标记,覆盖小麦21条染色体,总图距为5 194.09 cM,标记间的平均距离为1.42 cM,遗传图谱与中国春物理图谱共线性较好,表明图谱具有较高的质量。共检测到130个QTL,包含31个旗叶长度QTL、34个旗叶宽度QTL、33个旗叶长宽比QTL和32个旗叶面积QTL,分布于除小麦3B、3D和4D外的所有染色体上;其中,位于1A、2A、2B、2D、4B、5A、7A和7B等染色体上的20个位点是多环境稳定QTL,且10个是本研究新鉴定到的位点。在20个稳定QTL区间内共注释到3 923个基因,GO分析显示,其主要富集于转录延伸因子复合物、UDP-糖基转移酶活性、节律过程、染色质介导的转录维持等条目。根据QTL区间基因功能注释,以及对应的水稻同源基因的克隆和功能鉴定,并结合小麦功能基因发掘交互式分析平台的QTG miner模块分析,共筛选出55个候选基因,其在小麦根、茎、叶、穗和籽粒不同发育时期呈现不同的表达模式。此外,开发了10个与新鉴定的QTL紧密连锁的KASP分子标记。【结论】构建了一张小麦120K液相芯片的高密度遗传连锁图谱,检测到20个控制旗叶大小相关性状的稳定QTL,其中10个为新位点,开发了与其紧密连锁的KASP分子标记,并筛选出55个潜在候选基因。

关键词: 小麦, 旗叶大小, QTL定位, 120K液相芯片, 候选基因

Abstract:

【Objective】Flag leaf size is a critical component of wheat plant architecture, playing a vital role in photosynthesis, yield formation, and stress response. The identification of major quantitative trait loci (QTL) and candidate genes regulating flag leaf size-related traits will provide theoretical support and genetic resources for the molecular design breeding of high-yielding wheat ideotypes.【Method】A recombinant inbred line (RIL) population comprising 184 lines was derived from a cross between the Chinese elite cultivar Bainong 4199 (BN4199, female parent) and the exotic variety Zhengyinmai 2 (ZYM2, male parent). Genotyping of the BN4199/ZYM2-RIL population was performed using the wheat 120K liquid chip (120K-4HWA) to construct a high-density genetic linkage map. Based on the composite interval mapping (CIM) method, QTL mapping was performed to identify stable major-effect loci and to analyze their additive effects using the flag leaf size-related traits, including flag leaf length (FLL), flag leaf width (FLW), flag leaf length/width ratio (FLR), and flag leaf area (FLA), and the best linear unbiased estimate (BLUE) values obtained across four environments (two locations over two years). Furthermore, candidate gene annotation and identification, as well as tissue expression pattern analysis, were conducted using several wheat functional genomics databases. In addition, corresponding kompetitive allele-specific PCR markers (KASP) were developed based on polymorphic SNP sites located within the stable QTL intervals.【Result】A high-density genetic linkage map of the BN4199/ZYM2-RIL population was constructed, comprising 27 linkage groups with 3 666 SNP markers, covering all 21 wheat chromosomes. The map spanned 5 194.09 cM with an average inter-marker distance of 1.42 cM. High collinearity with the Chinese Spring physical map indicated the robustness of this genetic map. A total of 130 QTL were detected, including: 31 for FLL, 34 for FLW, 33 for FLR, and 32 for FLA, distributed across all chromosomes except 3B, 3D, and 4D. Among these, 20 loci on chromosomes 1A, 2A, 2B, 2D, 4B, 5A, 7A, and 7B were environmentally stable QTL, with 10 being novel loci reported for the first time. A total of 3 923 genes were annotated within the 20 stable QTL intervals. Gene Ontology (GO) analysis revealed significant enrichment in transcription elongation factor complex, UDP-glycosyltransferase activity, rhythmic processes, and chromatin-mediated maintenance of transcription. Based on gene function annotation, information from the cloning and characterization of rice orthologs, and analysis via the QTG-miner module of an interactive wheat functional gene discovery platform, 55 candidate genes were prioritized within stable QTL intervals, exhibiting different expression patterns at various developmental stages of wheat root, stem, leaf, spike and grain tissues. In addition, 10 KASP markers closely linked to the novel QTL were developed.【Conclusion】A high-density genetic linkage map was constructed using the wheat 120K liquid chip, and 20 stable major QTL controlling flag leaf size-related traits were detected, 10 of which were novel loci. The KASP molecular markers closely linked to novel QTL were developed, and 55 potential candidate genes were identified in this study.

Key words: wheat, flag leaf size, QTL mapping, 120K liquid chip, candidate genes