QTL mapping of stalk bending strength in a recombinant inbred line maize population

文献类型： 外文期刊

第一作者： Hu, Haixiao

作者： Hu, Haixiao;Liu, Wenxin;Chen, Shaojiang;Homann, Linda;Technow, Frank;Melchinger, Albrecht E.;Liu, Wenxin;Chen, Shaojiang;Fu, Zhiyi;Song, Chengliang;Li, Shitu;Wang, Hongwu

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期刊名称：THEORETICAL AND APPLIED GENETICS （ 影响因子：5.699； 五年影响因子：5.565 ）

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收录情况： SCI

摘要： Stalk bending strength (SBS) is a reliable indicator for evaluating stalk lodging resistance of maize plants. Based on biomechanical considerations, the maximum load exerted to breaking (F (max)), the breaking moment (M (max)) and critical stress (sigma (max)) are three important parameters to characterize SBS. We investigated the genetic architecture of SBS by phenotyping F (max), M (max) and sigma (max) of the fourth internode of maize plants in a population of 216 recombinant inbred lines derived from the cross B73 x Ce03005 evaluated in four environments. Heritability of F (max), M (max) and sigma (max) was 0.81, 0.79 and 0.75, respectively. F (max) and sigma (max) were positively correlated with several other stalk characters. By using a linkage map with 129 SSR markers, we detected two, three and two quantitative trait loci (QTL) explaining 22.4, 26.1 and 17.2 % of the genotypic variance for F (max), M (max) and sigma (max), respectively. The QTL for F (max), M (max) and sigma (max) located in adjacent bins 5.02 and 5.03 as well as in bin 10.04 for F (max) were detected with high frequencies in cross-validation. As our QTL mapping results suggested a complex polygenic inheritance for SBS-related traits, we also evaluated the prediction accuracy of two genomic prediction methods (GBLUP and BayesB). In general, we found that both explained considerably higher proportions of the genetic variance than the values obtained in QTL mapping with cross-validation. Nevertheless, the identified QTL regions could be used as a starting point for fine mapping and gene cloning.

分类号： R394

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