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- Title
Identification and Fine-Mapping of a Major Maize Leaf Width QTL in a Re-sequenced Large Recombinant Inbred Lines Population.
- Authors
Wang, Baobao; Zhu, Yanbin; Zhu, Jinjie; Liu, Zhipeng; Liu, Han; Dong, Xiaomei; Guo, Jinjie; Li, Wei; Chen, Jing; Gao, Chi; Zheng, Xinmei; E, Lizhu; Lai, Jinsheng; Zhao, Haiming; Song, Weibin
- Abstract
Leaf width (LW) influences canopy architecture of population-cultured maize and can thus contribute to density breeding. In previous studies, almost all maize LW-related mutants have extreme effect on leaf development or accompanied unfavorable phenotypes. In addition, the identification of quantitative trait loci (QTLs) has been resolution-limited, with cloning and fine-mapping rarely performed. Here, we constructed a bin map for 670 recombinant inbred lines (RILs) using 1.2 billion 100-bp re-sequencing reads. QTL analysis of the LWtrait directly narrowed the major effect QTL, qLW4, to a 270-kb interval. A fine-mapping population and near-isogenic lines (NILs) were quickly constructed using a key RIL harboring heterozygous genotypes across the qLW4 region. A recombinant-derived progeny testing strategy was subsequently used to further fine-map qLW4 to a 55-kb interval. Examination of NILs revealed that qLW4 has a completely dominant effect on LW, with no additional effect on leaf length. Candidate gene analysis suggested that this locus may be a novel LW controlling allele in maize. Our findings demonstrate the advantage of large-population high-density bin mapping, and suggest a strategy for efficiently fine-mapping or even cloning of QTLs. These results should also be helpful for further dissection of the genetic mechanism of LW variation, and benefit maize density breeding.
- Subjects
CORN genome mapping; PLANT canopies; CORN breeding
- Publication
Frontiers in Plant Science, 2018, p1
- ISSN
1664-462X
- Publication type
Article
- DOI
10.3389/fpls.2018.00101