QTL analysis of ear leaf traits in maize (Zea mays L.) under different planting densities

文献类型： 外文期刊

第一作者： Wang, Hongwu

作者： Wang, Hongwu;Liang, Qianjin;Li, Kun;Hu, Xiaojiao;Wu, Yujin;Wang, Hui;Liu, Zhifang;Huang, Changling

作者机构：

关键词： Maize;Quantitative trait loci;Leaf traits;Density treatment

期刊名称：CROP JOURNAL （ 影响因子：4.407； 五年影响因子：5.687 ）

ISSN： 2095-5421

年卷期： 2017 年 5 卷 5 期

页码：

收录情况： SCI

摘要： Modern maize varieties have become more productive than ever, owing largely to increased tolerance of high plant density. However, the genetics of ear leaf traits under different densities remains poorly understood. In this study, Zhongdan 909 recombinant inbred lines (RILs) derived from a cross between Z58 and HD568 were genotyped for 3072 single-nucleotide polymorphisms (SNPs), and phenotyped for leaf length (LL), leaf width (LW), and leaf angle (LA) of the uppermost ear leaf under three planting densities (52,500, 67,500, and 82,500 plants ha(-1), respectively). A genetic map was then constructed using 1358 high-quality SNPs. The total length of the linkage map was 1985.2 cM and the average interval between adjacent markers 1.46 cM. With increasing density, LL and LW decreased from 63.68 to 63.02 cm and from 8.56 to 8.21 cm, respectively, while LA increased from 19.42 degrees to 19.66 degrees. All three traits had high heritabilities, of 0.75, 0.78, and 0.84, respectively. Using inclusive composite interval mapping, 23, 25, and 17 quantitative trait loci (QTL) were detected for LL, LW, and LA, respectively. Of these, 35 were simultaneously detected under two or three plant densities, while 30 were detected under only one. Sixty-five individual QTL explained 2.41% to 16.53% of phenotypic variation, while eight accounted for > 10%. These findings will help us understand the genetic basis of leaf traits in maize as well as the response of maize to increased plant density. (C) 2017 Crop Science of China and Institute of Crop Science, CAAS. Production and hosting by Elsevier B.V.

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