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作物学报 ›› 2020, Vol. 46 ›› Issue (7): 1016-1024.doi: 10.3724/SP.J.1006.2020.93054

• 作物遗传育种·种质资源·分子遗传学 • 上一篇    下一篇

玉米耐深播主效QTL qMES20-10的精细定位及差异表达基因分析

任蒙蒙1,**,张红伟1,**,王建华2,王国英1,郑军1,*()   

  1. 1 中国农业科学院作物科学研究所, 北京100081
    2 中国农业大学农学院, 北京100193
  • 收稿日期:2019-10-12 接受日期:2020-04-15 出版日期:2020-07-12 网络出版日期:2020-04-26
  • 通讯作者: 郑军
  • 作者简介:任蒙蒙, E-mail: ren_mm1991@163.com|张红伟, E-mail: zhanghongwei@caas.cn
    ** 同等贡献
  • 基金资助:
    国家重点研发计划项目(2016YFD0101002);中国农业科学院创新工程专项

Fine mapping of a major QTL qMES20-10 associated with deep-seeding tolerance in maize and analysis of differentially expressed genes

REN Meng-Meng1,**,ZHANG Hong-Wei1,**,WANG Jian-Hua2,WANG Guo-Ying1,ZHENG Jun1,*()   

  1. 1 Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, China
    2 College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
  • Received:2019-10-12 Accepted:2020-04-15 Published:2020-07-12 Published online:2020-04-26
  • Contact: Jun ZHENG
  • About author:** Contributed equally to this work
  • Supported by:
    National Key Research and Development Program of China(2016YFD0101002);Agricultural Science and Technology Innovation Program of Chinese Academy of Agricultural Sciences

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摘要：

干旱是影响玉米(Zea mays L.)产量最主要的环境因素之一, 具有耐深播特性的玉米种质材料能够吸收土壤深层水分, 具有较强的耐旱性, 因此研究玉米耐深播性状的遗传机制具有重要的理论和应用价值。本实验室前期已利用耐深播玉米自交系3681-4与普通自交系X178构建的F2:3群体, 在玉米10号染色体上定位到了一个耐深播主效QTL qMES20-10。本研究在此基础上, 以X178为轮回亲本, 结合前景选择和背景选择, 构建了BC3F3:4家系, 对qMES20-10进行了确证; 并进一步利用分子标记辅助选择构建了高代回交群体, 将其精细定位于133.3~136.0 Mb的区间之内。同时, 利用从BC3F3:4家系中筛选出的两个近等基因系, 进行差异表达基因分析, 发现差异表达基因主要参与了化学性应激反应、氧化还原反应和对氧化胁迫的应激反应。本研究结果为进一步克隆耐深播主效QTL qMES20-10奠定了基础。

关键词: 玉米, 耐深播, QTL, 精细定位, 差异表达基因

Abstract:

Drought stress is a major threat to maize (Zea mays L.) yield. Deep-seeding tolerant maize variety can absorb water in deep soil and thus have strong drought tolerance. Therefore, it is of great theoretical and practical importance to study the genetic mechanism of deep-seeding tolerance. In our previous work, we identified a major QTL qMES20-10 controlling maize deep-seeding tolerance on chromosome 10 using an F2:3 population derived from a deep-seeding tolerant inbred line 3681-4 and a common inbred line X178. In this study, a BC3F3:4 population was constructed through background and foreground selection using X178 as the recurrent parent. The major QTL, qMES20-10, was firstly verified in this BC3F3:4 population. Furthermore, advanced backcross population was constructed through marker-assisted selection, and qMES20-10 was fine-mapped within the interval of 133.3-136.0 Mb on chromosome 10. Moreover, RNA-Seq analysis of two near-isogenic lines screened from the BC3F3:4 families identified the differentially expressed genes, mainly involved in chemical stimulus response, oxidation reduction, and oxidative stress response. These results lay a foundation of further cloning the major QTL qMES20-10.

Key words: maize, deep-seeding tolerance, QTL, fine mapping, differentially expressed genes

图1

表型鉴定方法和亲本材料表型 A: 表型鉴定方法示意图。B: 20 cm播深条件下亲本材料的中胚轴, 标尺=1 cm。C: 亲本材料的中胚轴长度; **表示0.01水平下差异显著。"

表1

本研究所用的引物"

引物
Primer		 物理位置
Position		 正向序列
Forward sequence (5'-3')		 反向序列
Reverse sequence (5'-3')
umc1506 133,239,898 ATAAAGGTTGGCAAAACGTAGCCT AAAAGAAACATGTTCAGTCGAGCG
DST_InD25 133,799,178 TGCGCTTTATTAGGCGAAAC TTTACGCGTTATGGGAGACC
DST_Ind7 134,830,243 GCTTGCTGCATTGTCTTGAA GGCAGATTGACACTGGTGAA
DST_Ind105 136,072,789 AGAGAGACAGCCGCACTTG TCGACCGTACTTGTTCATGG
DST_InD13 136,274,298 GGCAACAGTTCGACGGATTA TCCGGATGATGTTTACATGG
bnlg1028 138,503,281 AGGAAACGAACACAGCAGCT TGCATAGACAAAACCGACGT

图2

耐深播主效QTL qMES20-10确证 A: BC3F3:4家系中3种基因型材料的中胚轴长度。A、H、B分别表示X178纯合、杂合、3681-4纯合3种基因型。P值是对3种基因型材料的中胚轴长度作方差分析得到。B: BC3F3:4家系全基因组QTL检测。"

图3

耐深播主效位点qMES20-10的精细定位 A: 目标QTL qMES20-10所在的染色体区段。B: 用BC4F2:3家系进行精细定位。R1~R9表示9种不同的重组类型, 黑色和白色区段分别代表来自亲本3681-4和X178的染色体片段。** 和 * 分别表示在0.01和0.05水平下差异显著, NS表示无显著差异。"

图4

后代测验验证定位区间 A: 交换单株的交换位置。B: 对交换单株的后代进行基因型和表型分析。图中黑色、白色和灰色区段分别代表来自3681-4、X178和杂合的染色体片段。n代表不同基因型单株的个数, P值是不同基因型单株的中胚轴长度做t测验得到。"

图5

差异基因统计和分布图 A: 两组差异表达基因的韦恩图。B: 两组差异表达基因在染色体上的分布图, 大圆和小圆分别表示两亲本和近等基因系中的差异表达基因。P-value通过对两组基因的表达量做t测验获得, 红色的点表示P-value小于0.0001的基因。"

图6

近等基因系中差异基因GO分析 A: 灰色方框表示能富集到的通路。B: KEGG网站中植物激素信号转导途径富集到的差异表达基因。"

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