中国农业科学 ›› 2020, Vol. 53 ›› Issue (22): 4527-4536.doi: 10.3864/j.issn.0578-1752.2020.22.001
赵久然,李春辉,宋伟(),刘新香,王元东,张如养,王继东,孙轩,王夏青
收稿日期:
2020-02-15
接受日期:
2020-03-25
出版日期:
2020-11-16
发布日期:
2020-11-28
通讯作者:
宋伟
作者简介:
赵久然,E-mail:基金资助:
ZHAO JiuRan,LI ChunHui,SONG Wei(),LIU XinXiang,WANG YuanDong,ZHANG RuYang,WANG JiDong,SUN Xuan,WANG XiaQing
Received:
2020-02-15
Accepted:
2020-03-25
Online:
2020-11-16
Published:
2020-11-28
Contact:
Wei SONG
摘要: 【目的】 玉米骨干自交系京2416是以(京24×5237)×京24构建基础选系群体,利用高大严及同群优系聚合等选系技术选育的优良黄改群自交系。以其为父本育成的审定品种已有20多个,其中代表性品种京农科728,突破了黄淮海夏玉米籽粒机收技术瓶颈,成为中国首批通过国家审定的机收籽粒品种。通过分析京2416与X群种质的杂种优势,及其形成过程中的重组事件和黄早四基因组片段传递规律,解析京2416形成的遗传机制,以期为黄改系的进一步遗传改良提供参考。【方法】 选用黄早四、京2416及其2个选系亲本(京24和5237)为材料,与5份X群代表性自交系根据NCII遗传设计组配杂交组合,利用F1产量相关性状单穗粒重的中亲优势、超高亲优势值和配合力效应值评估4份黄改系的杂种优势。对4份黄改系及5份X群自交系进行测序深度约为18×的全基因组重测序,用BWA、GATK等软件进行序列比对和变异检测,基于获得的SNP和InDel标记信息,利用GCTA和Treebest软件进行主成分分析和系统发生树构建,同源传递片段(identity-by-descent,IBD)使用IBDseq软件识别。【结果】 通过比较分析黄早四、京2416、京24、5237与5份X群代表系所配杂交组合的F1产量相关性状发现,与其他3份材料(黄改系京24、5237和黄早四)相比,京2416具有更高的超高亲优势和一般配合力。基于全基因组重测序数据,分析重现了京2416形成过程中的重组事件,明确京2416的基因组组成,选系亲本京24和5237在京2416基因组中保留的比例分别为80.96%和19.04%。利用基因组测序数据解析从黄早四到京2416的IBD片段,结果表明,京2416从京24和5237 2个选系亲本中聚合了全部的9个重要黄改系特征性选择区域。【结论】 骨干自交系京2416在遗传改良过程中,通过染色体重组聚合选系亲本京24和5237所有的9个重要黄改系特征性选择区域,从分子水平解释了京2416与X群代表系表现出更高配合力的遗传基础。
赵久然, 李春辉, 宋伟, 刘新香, 王元东, 张如养, 王继东, 孙轩, 王夏青. 玉米骨干自交系京2416杂种优势及遗传重组解析[J]. 中国农业科学, 2020, 53(22): 4527-4536.
ZHAO JiuRan, LI ChunHui, SONG Wei, LIU XinXiang, WANG YuanDong, ZHANG RuYang, WANG JiDong, SUN Xuan, WANG XiaQing. Heterosis and Genetic Recombination Dissection of Maize Key Inbred Line Jing2416[J]. Scientia Agricultura Sinica, 2020, 53(22): 4527-4536.
表1
9份自交系及其系谱来源"
序号Code | 自交系Inbred lines | 系谱来源Pedigree |
---|---|---|
1 | 京2416 Jing2416 | 京24×5237 Jing24×5237 |
2 | 京24 Jing24 | 早熟302×黄野四 Zaoshu302×Huangyesi |
3 | 5237 | 502×丹340 502×Dan340 |
4 | 黄早四 Huangzaosi | 塘四平头选系 Selected from Tangsipingtou |
5 | 京724 Jing724 | X1132x选系 Selected from X1132x |
6 | 京464 Jing464 | X1132x选系 Selected from X1132x |
7 | DH382 | X1132x选系 Selected from X1132x |
8 | 京725 Jing725 | X1132x选系 Selected from X1132x |
9 | 京MC01 JingMC01 | X1132x选系 Selected from X1132x |
表2
4个黄改系和5个X系之间的杂交组合单穗粒重的杂种优势"
杂种优势 Heterosis | 亲本 Parents | DH382 | 京MC01 JingMC01 | 京464 Jing464 | 京724 Jing724 | 京725 Jing725 |
---|---|---|---|---|---|---|
中亲优势 Mid-parent heterosis | 京2416 Jing2416 | 99.35 | 89.27 | 103.30 | 87.31 | 90.78 |
京24 Jing24 | 94.06 | 89.51 | 80.88 | 76.55 | 84.20 | |
5237 | 70.95 | 60.91 | 72.39 | 82.32 | 58.03 | |
黄早四 Huangzaosi | 113.93 | 100.77 | 106.84 | 82.11 | 70.86 | |
超高亲优势 Over-high parent heterosis | 京2416 Jing2416 | 84.48 | 83.87 | 82.46 | 67.25 | 62.60 |
京24 Jing24 | 80.02 | 84.57 | 62.71 | 58.00 | 57.33 | |
5237 | 63.37 | 60.11 | 59.59 | 67.90 | 38.65 | |
黄早四 Huangzaosi | 70.79 | 66.77 | 61.08 | 41.24 | 27.65 |
表3
4个黄改系亲本单穗粒重一般配合力相对效应值和20个杂交组合特殊配合力相对效应值"
亲本 Parents | RGCA (%) | RSCA (%) | ||||
---|---|---|---|---|---|---|
DH382 | 京MC01 JingMC01 | 京464 Jing464 | 京724 Jing724 | 京725 Jing725 | ||
京2416 Jing2416 | 7.50 | -1.78 | -2.43 | 2.47 | -2.04 | 3.78 |
京24 Jing24 | 2.68 | 0.43 | 2.75 | -5.02 | -3.06 | 4.89 |
5237 | -3.43 | -3.15 | -3.15 | -0.85 | 9.29 | -2.13 |
黄早四 Huangzaosi | -6.75 | 4.50 | 2.83 | 3.40 | -4.19 | -6.54 |
表4
9份玉米自交系的测序信息"
材料名称 Sample name | 读长数 Reads (M) | 碱基数量 Bases (Gb) | 读长比对率 Map reads (%) | 比对reads数量 Map reads | 测序深度 Depth | 覆盖度 Coverage (%) |
---|---|---|---|---|---|---|
京2416 Jing2416 | 237.49 | 35.07 | 90.45 | 212725920 | 15.90 | 88.93 |
京24 Jing24 | 230.52 | 33.89 | 89.65 | 204550192 | 15.36 | 88.90 |
5237 | 148.07 | 22.21 | 90.36 | 133672852 | 13.03 | 91.52 |
黄早四 Huangzaosi | 296.63 | 37.08 | 91.03 | 293757182 | 16.81 | 97.24 |
DH382 | 155.61 | 22.73 | 88.87 | 136266112 | 11.04 | 88.80 |
京MC01 JingMC01 | 458.36 | 61.74 | 90.88 | 410270768 | 29.98 | 89.91 |
京724 Jing724 | 183.13 | 26.86 | 88.66 | 159907952 | 13.04 | 87.15 |
京725 Jing725 | 393.95 | 53.81 | 90.01 | 349216966 | 26.13 | 89.36 |
京464 Jing464 | 350.51 | 48.59 | 89.99 | 310638312 | 23.60 | 89.47 |
均值 Mean | 281.80 | 38.72 | 92.32 | 257719899 | 18.32 | 90.14 |
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