数字农科院2.0

Genetic dissection of maize plant architecture using a novel nested association mapping population

文献类型： 外文期刊

作者： Sheng Zhao; Xueying Li; Junfeng Song; Huimin Li; Xiaodi Zhao; Peng Zhang; Zhimin Li; Zhiqiang Tian; Meng Lv; Ce Deng; Tangshun Ai; Gengshen Chen; Hui Zhang; Jianlin Hu; Zhijun Xu; Jiafa Chen; Junqiang Ding; Weibin Song; Yuxiao Chang

期刊名称： Plant Genome

ISSN： 1940-3372

年卷期： 2021 年

页码：

收录情况： JCR（2021版）

摘要： The leaf angle (LA), plant height (PH), and ear height (EH) are key plant architec- tural traits influencing maize (Zea mays L.) yield. However, their genetic determi- nants have not yet been well-characterized. Here, we developed a maize advanced backcross-nested association mapping population in Henan Agricultural University (HNAU-NAM1) comprised of 1,625 BC1 F4 /BC2 F4 lines. These were obtained by crossing a diverse set of 12 representative inbred lines with the common GEMS41 line, which were then genotyped using the MaizeSNP9.4K array. Genetic diversity and phenotypic distribution analyses showed considerable levels of genetic variation. We obtained 18–88 quantitative trait loci (QTLs) associated with LA, PH, and EH by using three complementary mapping methods, named as separate linkage mapping, joint linkage mapping, and genome-wide association studies. Our analyses enabled the identification of ten QTL hot-spot regions associated with the three traits, whichwere distributed on nine different chromosomes. We further selected 13 major QTLs that were simultaneously detected by three methods and deduced the candidate genes, of which eight were not reported before. The newly constructed HNAU-NAM1 pop- ulation in this study will further broaden our insights into understanding of genetic regulation of plant architecture, thus will help to improve maize yield and provide an invaluable resource for maize functional genomics and breeding research.

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