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作物杂志,2023, 第3期: 51–57 doi: 10.16035/j.issn.1001-7283.2023.03.007

• 遗传育种·种质资源·生物技术 • 上一篇    下一篇

玉米―大刍草渗入系群体的剑叶遗传基础解析

高沐甜1(), 邱冠杰1, 朱通通1, 李瑞莲1,2,3, 邓敏1,2,3, 罗红兵1,2,3, 黄成1,2,3()   

  1. 1湖南农业大学农学院，410128，湖南长沙
    2作物生理与分子生物学教育部重点实验室，410128，湖南长沙
    3湖南省玉米工程技术研究中心，410128，湖南长沙
  • 收稿日期:2022-03-29 修回日期:2022-04-06 出版日期:2023-06-15 发布日期:2023-06-16
  • 通讯作者: 黄成，主要从事玉米分子遗传育种研究，E-mail：hc66@hunau.edu.cn
  • 作者简介:高沐甜，主要从事玉米种质资源创新与利用研究，E-mail：gmt66@stu.hunau.edu.cn
  • 基金资助:
    长沙市杰出创新青年培养计划项目(kq2209016);湖南省普通高校青年骨干教师培养项目;湖南省作物种质创新与资源利用重点实验室开放研究项目(19KFXM10);湖南农业大学青年科学基金项目(19QN16)

Dissecting the Genetic Basis of Flag Leaf in Maize-Teosinte Introgression Line Population

Gao Mutian1(), Qiu Guanjie1, Zhu Tongtong1, Li Ruilian1,2,3, Deng Min1,2,3, Luo Hongbing1,2,3, Huang Cheng1,2,3()   

  1. 1College of Agronomy, Hunan Agricultural University, Changsha 410128, Hunan, China
    2Key Laboratory of the Ministry of Education for Crop Physiology and Molecular Biology, Changsha 410128, Hunan, China
    3Maize Engineering Technology Research Center of Hunan Province, Changsha 410128, Hunan, China
  • Received:2022-03-29 Revised:2022-04-06 Online:2023-06-15 Published:2023-06-16

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摘要：

玉米剑叶是玉米雌穗苞叶顶端的延伸，其不仅受气候和土壤等环境因素影响，同时也受遗传因素控制。利用一套由玉米自交系W22与玉米野生祖先种大刍草（Zea mays ssp. parviglumis）杂交衍生得到的包含866个家系的渗入系材料，结合19 838个SNP分子标记，采用R/qtl的多QTL模型对玉米剑叶进行QTL定位分析。结果显示，共检测到9个控制玉米剑叶的QTL，分别位于第1、2、3、4、5、7和8号染色体。9个QTL共解释30.94%的表型变异，单个QTL的表型贡献率变幅为1.76%~11.51%，加性效应的变幅为-0.03~0.12，表明玉米剑叶是由多基因控制的数量性状。相关性分析表明，玉米剑叶与株高、穗位高、茎长和叶绿素含量呈显著正相关，与百粒重、粒宽和粒厚呈显著负相关。进一步利用转录组数据对最大效应QTL（qFL3-1）进行候选基因表达分析，筛选出5个可能的候选基因。

关键词: 玉米, 大刍草, 渗入系群体, 剑叶, 遗传基础

Abstract:

Maize flag leaves are extended from the tips of ear husks, which are not only affected by environmental factors such as climate and soil, but also controlled by genetic factors. Using a large population of 866 maize-teosinte introgression lines that had been genotyped with 19 838 SNP markers, we performed a QTL mapping for maize flag leaf by applying the multiple QTL model in R/qtl. The results showed that a total of nine QTLs for maize flag leaf were located on chromosome 1, 2, 3, 4, 5, 7 and 8. All nine loci attributed to 30.94% of the phenotypic variation, with the phenotypic contribution rate and additive effect of each QTL ranged from 1.76% to 11.51% and from -0.03 to 0.12, respectively, indicating that the maize flag leaf was a quantitative trait controlled by a number of loci. Pearson correlation coefficient analysis showed that maize flag leaf was significantly positively correlated with plant height, ear height, stem length, and chlorophyll content, and it was significantly negatively correlated with 100-seed weight, seed width, and seed thickness. Further analysis of candidate genes for the largest effect QTL (qFL3-1) using the transcriptome data, five possible candidate genes were screened out.

Key words: Maize, Teosinte, Introgression line population, Flag leaf, Genetic basis

图1

渗入系群体剑叶表型分析 (a) 代表性家系的剑叶表型；比例尺：10cm。(b) 剑叶表型比例分布

图2

剑叶与其他性状相关性分析 IL：茎长；CC：叶绿素含量；EH：穗位高；PH：株高；SL：粒长；SD：茎粗；SGR：种子出苗率；ST：粒厚；SW：粒宽；HSW：百粒重；红色表示正相关；蓝色表示负相关；“*”：0.05水平显著；“**”：0.01水平显著

图3

渗入系群体剑叶QTL图谱 同一染色体上不同QTL用不同颜色表示；水平红色虚线代表显著QTL的LOD阈值

表1

剑叶QTL定位结果

QTLs 染色体
Chromosome		 标记区间
Marker interval		 位置
Position (cM)		 LOD值
LOD value		 加性效应
Additive effect		 显性效应
Dominant effect		 贡献率
Contribution rate (%)
qFL1-1 1 m00191~m01743 49.98 7.23 0.04 0.04 2.86
qFL1-2 1 m04426~m05704 89.19 6.95 0.05 0.02 2.75
qFL2-1 2 m08696~m12985 106.05 4.74 0.05 -0.01 1.86
qFL3-1 3 m16430~m16819 73.50 27.49 0.12 0.02 11.51
qFL4-1 4 m21495~m22749 79.50 8.03 0.07 -0.06 3.18
qFL5-1 5 m25472~m25799 28.56 5.81 0.05 0.00 2.29
qFL5-2 5 m29042~m29724 89.22 4.49 0.05 0.00 1.76
qFL7-1 7 m39972~m40321 119.97 5.25 -0.03 -0.03 2.07
qFL8-1 8 m42951~m44940 106.04 4.93 -0.04 0.02 1.94

图4

qFL3-1位点候选基因分析 (a) qFL3-1位点LOD图谱；水平红色虚线代表显著QTL的LOD阈值；垂直蓝色区域代表qFL3-1位点的置信区间。(b) 置信区间内基因结构图。(c) 置信区间内基因表达图谱

表2

qFL3-1候选基因

基因编号
Gene ID		 染色体
Chromosome		 基因起始位置
Gene starting position (bp)		 基因终止位置
Gene end position (bp)		 功能注释
Functional annotation
Zm00001d042099 3 150 690 594 150 691 502 谷胱甘肽S-转移酶
Zm00001d042104 3 150 759 060 150 760 119 谷胱甘肽S-转移酶
Zm00001d042117 3 151 572 267 151 577 836 吡咯啉-5-羧酸还原酶
Zm00001d042134 3 152 750 251 152 755 325 氨基酸通透酶
Zm00001d042135 3 152 759 924 152 768 979 氨基酸通透酶
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