基于遗传解析新模式的小麦寡分蘖QTL的鉴定和验证  

Identification and verification of low-tillering QTL based on a new model of genetic analysis in wheat

作　　者：张智源 周界光 刘家君 王素容 王同著 赵聪豪 尤佳宁 丁浦洋 唐华苹 刘燕林 江千涛[1] 陈国跃[1] 魏育明[1] 马建[1] ZHANG Zhi-Yuan;ZHOU Jie-Guang;LIU Jia-Jun;WANG Su-Rong;WANG Tong-Zhu;ZHAO Cong-Hao;YOU Jia-Ning;DING Pu-Yang;TANG Hua-Ping;LIU Yan-Lin;JIANG Qian-Tao;CHEN Guo-Yue;WEI Yu-Ming;MA Jian(Triticeae Research Institute,Sichuan Agricultural University,Chengdu 611130,Sichuan,China;Research Center of Sichuan Old Revolutionary Areas Development,Sichuan University of Arts and Science,Dazhou 635000,Sichuan,China;Industrial Crop Research Institute,Sichuan Academy of Agricultural Sciences,Chengdu 610300,Sichuan,China;College of Life Science&Biotechnology,Mianyang Teachers’College,Mianyang 621000,Sichuan,China)

机构地区：[1]四川农业大学小麦研究所,四川成都611130 [2]四川文理学院四川革命老区发展研究中心,四川达州635000 [3]四川省农业科学院经济作物研究所,四川成都610300 [4]绵阳师范学院生命科学与技术学院,四川绵阳621000

出　　处：《作物学报》2024年第6期1373-1383,共11页Acta Agronomica Sinica

基　　金：国家自然科学基金项目(31971937);四川省国际合作交流项目(2021YFH0083)资助。

摘　　要：有效分蘖数可直接影响小麦的成穗数,与产量关系极为密切。挖掘小麦分蘖数相关数量性状位点,解析分蘖数与其他重要农艺性状之间的相关性,可为分子育种提供理论依据。本研究首先提出和建立了“多个环境评价-单个性状深入-综合性状兼顾-友好标记开发-不同背景验证”的遗传解析新模式。进一步利用该模式,以寡分蘖自然变异植株msf和川农16(CN16)构建的F6代重组自交系群体(MC群体)为实验材料,以多年多点的有效分蘖数作为表型数据,借助基于16K芯片构建的遗传连锁图谱成功定位和验证了寡分蘖遗传调控位点。QTL定位结果显示,1A、5A和6D染色体上有4个控制寡分蘖的QTL。其中Qltn.sau-MC-1A为稳定主效的寡分蘖QTL,解释了13.39%~60.40%的表型变异,其正效应位点来源于msf。表型分析发现,携带Qltn.sau-MC-1A正效应位点株系的有效分蘖数显著少于携带Qltn.sau-MC-1A负效应位点株系的有效分蘖数。相关性分析表明,有效分蘖数和株高之间存在极显著的正相关,与千粒重、每穗粒数、每穗粒重、旗叶宽之间存在显著的负相关,有效分蘖数与旗叶长、开花期之间无显著相关。遗传分析结果表明,Qltn.sau-MC-1A正效应位点显著增加每穗粒数、每穗粒重和千粒重,但推迟开花期。不同遗传背景下的验证结果表明,携带Qltn.sau-MC-1A正效应位点的株系确实能降低有效分蘖数。综上,本研究建立了一种遗传解析新模式,并基于此模式解析、定位和验证了一个控制寡分蘖的主效QTL Qltn.sau-MC-1A,为进一步精细定位和了解分蘖形成机制奠定了基础。Effective tiller number(ETN)directly affects panicle number and is closely related to wheat grain yield.Mining quantitative trait loci(QTLs)associated with wheat tiller number and analyzing the correlation between tiller number and other important agronomic traits can provide the theoretical basis for molecular breeding.In this study,we first proposed and established a novel genetic analysis framework of“multiple environmental assessments-depth analysis of individual traits-comprehensive evaluation of various traits-friendly marker development-verification in different backgrounds”.Using this approach,low-tillering QTLs were identified and validated base on an F6 recombinant inbred line population(MC population)derived from the low-tillering plant msf and Chuannong 16(CN16),phenotypic data of effective tillers from multiple environments,and a 16K chip-based constructed genetic linkage map.QTL mapping results showed that there were four QTLs controlling tillering on chromosomes 1A,5A,and 6D,respectively.Qltn.sau-MC-1A was a stable and major low-tillering QTL explaining 13.39%–60.40%of the phenotypic variation rate,and its positive allele was from msf.Phenotypic analysis showed that ETN of the lines carrying the positive allele of Qltn.sau-MC-1A was significantly less than those with the negative alleles.Correlation analysis showed that ETN had a significantly positive correlation with plant height(PH),and a significantly negative correlation with thousand kernel weight(TKW),kernel number per spike(KNPS),kernel weight per spike(KWPS),and flag leaf width(FLW),but no significantly correlation with flag leaf length(FLL)and anthesis date(AD).Genetic analysis showed that positive allele of Qltn.sau-MC-1A had a significant effect on increasing KNPS,KWPS,and TKW,but delaying AD.Validation results in different backgrounds suggested that the ETN of lines carrying positive alleles from Qltn.sau-MC-1A could be significantly decreased.Collectively,we established a new genetic mapping approach and further used it to ident

关 键 词：小麦 遗传解析新模式 16K SNP芯片 QTL 寡分蘖 产量 

分 类 号：S512.1[农业科学—作物学]