中国农业科学 ›› 2020, Vol. 53 ›› Issue (9): 1743-1755.doi: 10.3864/j.issn.0578-1752.2020.09.005

• 专题:限制性两阶段多位点全基因组关联分析法的应用 • 上一篇    下一篇

大豆巢式关联作图群体蛋白质含量的遗传解析

李曙光1,2,曹永策1,贺建波1(),王吴彬1,邢光南1,杨加银2,赵团结1,盖钧镒1()   

  1. 1 南京农业大学大豆研究所/国家大豆改良中心/农业部大豆生物学与遗传育种重点实验室/作物遗传与种质创新国家重点实验室/江苏省现代作物生产协同创新中心,南京 210095;
    2 江苏徐淮地区淮阴农业科学研究所,江苏淮安 223001
  • 收稿日期:2019-08-26 接受日期:2019-11-30 出版日期:2020-05-01 发布日期:2020-05-13
  • 通讯作者: 贺建波,盖钧镒
  • 作者简介:李曙光,E-mail:dawn0524@126.com。
  • 基金资助:
    国家自然科学基金(31701447);国家自然科学基金(31571695);国家作物育种重点研发计划(2017YFD0101500);国家作物育种重点研发计划(2017YFD0102002);长江学者和创新团队发展计划(PCSIRT_17R55);教育部111项目(B08025);中央高校基本科研业务费项目(KYT201801);农业部国家大豆产业技术体系CARS-04;江苏省优势学科建设工程专项;江苏省JCIC-MCP项目;淮安市科技计划(HAB201846);淮安市农业科学研究院院长科研基金(HNY201703);作物遗传与种质创新国家重点实验室开放课题基金(ZW201713);江苏省自然科学基金(BK20151285)

Genetic Dissection of Protein Content in a Nested Association Mapping Population of Soybean

ShuGuang LI1,2,YongCe CAO1,JianBo HE1(),WuBin WANG1,GuangNan XING1,JiaYin YANG2,TuanJie ZHAO1,JunYi GAI1()   

  1. 1 Soybean Research Institute, Nanjing Agricultural University/National Center for Soybean Improvement/Key Laboratory of Biology and Genetic Improvement of Soybean (General), Ministry of Agriculture/State Key Laboratory for Crop Genetics and Germplasm Enhancement/Jiangsu Collaborative Innovation Center for Modern Crop Production, Nanjing 210095;
    2 Huaiyin Institute of Agricultural Sciences of Xuhuai Region in Jiangsu, Huai’an 223001, Jiangsu
  • Received:2019-08-26 Accepted:2019-11-30 Online:2020-05-01 Published:2020-05-13
  • Contact: JianBo HE,JunYi GAI

摘要:

【目的】大豆是重要的经济作物,是人类植物蛋白质和油脂的主要来源。蛋白质含量作为大豆育种的主要目标之一,属于多基因控制的复杂数量性状,并且受环境条件的影响。通过对大豆巢式关联作图群体的蛋白质含量进行全基因组关联分析,解析其遗传构成,为高蛋白质含量的大豆品种育种提供理论基础。【方法】以蒙8206为共同亲本,对临河×蒙8206、正阳×蒙8206、蒙8206×通山与蒙8206×WSB分别杂交,通过单粒传法自交7代衍生的4个重组自交系群体,共计623个家系,整合为一个大豆巢式关联作图群体,利用RAD-seq技术进行SNP标记基因分型,并于2012年至2014年将该群体种植在5个不同田间环境,在大豆完熟期R8时测定蛋白质含量,利用限制性两阶段多位点全基因组关联分析方法(RTM-GWAS)来解析蛋白质含量的遗传构成。【结果】试验群体的蛋白质含量变异较大,蛋白质含量性状遗传率较高,遗传变异可解释85.00%的表型变异。多环境联合方差分析表明,蛋白质含量的基因型、环境以及基因型×环境均达到差异极显著水平。全基因组关联分析共检测到90个蛋白质含量QTL,其中新检测到20个QTL,每个QTL的表型变异解释率为0.06%—3.99%,贡献率总和为45.60%。每个QTL包含2—5个等位变异,等位变异效应为-2.434%—2.845%,大多数等位变异效应为-1.000%—1.000%,表明大多数等位变异的效应较小。根据检测的90个蛋白质含量QTL,预测了73个蛋白质含量相关基因,其中Glyma20g24830参与甘氨酸与芳香族氨基酸代谢,Glyma18g03540参与半胱氨酸生物合成,推测其为重要蛋白质含量候选基因。根据试验群体的蛋白质含量QTL-allele矩阵,预测出潜在杂交组合的纯系后代的蛋白质含量育种潜力高达56.5%。【结论】检测到90个大豆蛋白质含量QTL,新检测到20个QTL,预测到73个蛋白质含量相关基因,表明大豆蛋白质含量是由多基因控制的数量性状。

关键词: 大豆, 巢式关联作图群体, 蛋白质含量, 限制性两阶段多位点全基因组关联分析

Abstract:

【Objective】Soybean is an important cash crop, a major source of plant protein and oil for human diet. As a major objective of soybean breeding, protein content is a complex trait controlled by multiple genes with varying genetic effects interacting with environment. A genome-wide association study (GWAS) was conducted to dissect the genetic architecture of protein content in a soybean nested association mapping (NAM) population, and the detected genetic constitution can be further used for molecular design in soybean breeding for high protein content. 【Method】Four soybean recombinant inbred line (RIL) populations (Linhe×M8206, Zhengyang×M8206, M8206×Tongshan and M8206×WSB) with a common parent (M8206) as a NAM population were constructed, genotyped with RAD-seq (restriction-site-associated DNA sequencing) and tested under multiple locations in 2012 - 2014. Protein content was measured at full maturity (R8) stage. The restricted two-stage multi-locus GWAS (RTM-GWAS) procedure was used to dissect the genetic architecture of seed protein content of the population. 【Result】The protein content varied widely in the population with trait heritability estimated as high as 85.00%. The analysis of variance for protein content showed significant differences across genotypes, environments and genotype-by-environment interactions. A total of 90 QTLs were detected to be associated with protein content, with 20 loci being novel ones. The phenotypic variation explained by each QTL ranged from 0.06% to 3.99%, with a sum of 45.60%. The number of alleles at each locus ranged from 2 to 5, and the allele effects ranged from -2.434% to 2.845%, while most of them were between -1.000% and 1.000%. From the detected QTLs, 73 candidate genes were annotated. Among these candidate genes, Glyma18g03540 involved in cysteine biosynthetic process, and Glyma20g24830 involved in glycine and aromatic amino acid family metabolic process. The two genes may be selected for further functional study. Based on the QTL-allele matrix of protein content, the predicted transgressive potential of cross progeny was as high as 56.5%. 【Conclusion】A total of 90 QTLs for protein content were detected with 20 loci being novel, from which 73 candidate genes were annotated, indicating that protein content is a complex trait conferred by multiple genes or a gene network.

Key words: soybean [Glycine max (L.) Merr.], nested association mapping population (NAM), protein content, restricted two-stage multi-locus genome-wide association analysis