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Polymerization of beneficial plant height QTLs to develop superior lines which can achieving hybrid performance levels

文献类型： 外文期刊

作者： Kang, Congbin 1 ; Zhang, Lin 2 ; Hao, Yichen 1 ; Sun, Mingfei 1 ; Li, Mengyao 1 ; Tian, Ziang 1 ; Dong, Ling 2 ; Liu, Xianjun 2 ; Zeng, Xing 2 ; Sun, Yanjie 3 ; Cao, Shiliang 4 ; Zhao, Yajie 1 ; Zhou, Chao 1 ; Zhao, Xiang Yu 1 ; Zhang, Xian Sheng 1 ; Luebberstedt, Thomas 5 ; Yang, Xuerong 1 ; Liu, Hongjun 1 ;

作者机构： 1.Shandong Agr Univ, Coll Agron, State Key Lab Wheat Improvement, Tai An 271018, Peoples R China

2.Northeast Agr Univ, Coll Agr, Harbin 150030, Peoples R China

3.Heilongjiang Acad Agr Sci, Suihua Branch, Suihua 152052, Peoples R China

4.Heilongjiang Acad Agr Sci, Maize Res Inst, Harbin 150086, Peoples R China

5.Iowa State Univ, Dept Agron, Ames, IA 50011 USA

关键词： Heterosis; Complex agronomic traits; Plant height; Molecular design; Pyramiding QTL line (PQL); Maize

期刊名称：MOLECULAR BREEDING （ 影响因子：3.0； 五年影响因子：3.0 ）

ISSN： 1380-3743

年卷期： 2025 年 45 卷 2 期

页码：

收录情况： SCI

摘要： Heterosis, a key technology in modern commercial maize breeding, is limited by the narrow genetic base which hinders breeders from developing superior hybrid varieties. By integrating big data and functional genomics technologies, it becomes possible to create new super maize inbred lines that resemble hybrid varieties through the aggregation of multiple QTL parental advantage loci. In this study, we utilized a combination of resequencing and field selfing selection methods to develop three pyramiding QTL lines (PQLs) (PQL4, 6, and 7), each containing 15, 12, and 12 QTL loci respectively. Among the three PQLs, PQL6 (266.78 cm/119.39 cm) demonstrated hybrid-like performance comparable to the hybrid (276.96 cm/127.02 cm) (P < 0.05). Testcross between PQL6 and the parental lines revealed that PQL6 had accumulated and fixed advanced parent alleles for superior traits in plant and ear height. The significant increase in PQL6 plant height primarily resulted from the aggregation of two major effective QTL (qEH2-1 and qEH8-1 on chromosomes 2 and 8), indicating that the aggregation of major effective QTL is a key selection indicator. Furthermore, PQL6 exhibited slow vegetative growth but experienced a rapid height increase during the reproductive stage, particularly in the 1-2 weeks before flowering, when its growth rate accelerated and surpassed that of the hybrid varieties. Our study explored the time period and key parameter indicators for molecular breeding of maize, providing a theoretical concept and practices for further complex multi-trait design and aggregation.

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