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Genetic analysis of heterosis for maize grain yield and its components in a set of SSSL testcross populations

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Abstract

The present study aimed to dissect the genetic basis of heterosis for grain yield and its components in maize (Zea mays L.). Quantitative trait loci (QTL) and heterotic loci (HL) were analyzed using a set of 203 single segment substitution lines (SSSLs) and its testcross population in three environments. Forty-one QTL were identified as responsible for grain yield, ear length, ear diameter, row number, kernel number per row, and 100-kernel weight in the SSSLs population, and 17 QTL were conserved across the three environments. In the heterosis analysis, 36 HL were identified for grain yield and five yield-related traits in the test population in the three environments. Among the HL, only six (16.7 %) for ear length, kernel number per row, 100-kernel weight, and grain yield were consistent with the results of QTL mapping. In addition, 16.7 % of the heterotic loci showed a dominant effect and 83.3 % showed an over-dominant effect. The results implied that dominance and over-dominance were two important components of heterosis in maize grain yield and yield-related traits in the present testcross population.

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Acknowledgments

This work was supported by the State Key Basic Research and Development Plan of China (2014CB138203) and the National Natural Science Foundation of China (31271732).

Author contributions

JT designed and supervised the study. XW, XL, MX, KM, WL, FW and PS performed the experiments, and XW, ZZ, KM and MX analyzed the data. XW, XL and ZZ prepared the manuscript. All the authors read and approved the manuscript.

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    Authors and Affiliations

    1. Department of Agronomy, Key Laboratory of Wheat and Maize Crops Science/Collaborative Innovation Center of Henan Grain Crops/College of Agronomy, Henan Agricultural University, 95 Wenhua Road, Zhengzhou, 450002, China

      Xiaoyi Wei, Xiaomin Lu, Zhanhui Zhang, Mengmeng Xu, Keju Mao, Weihua Li & Jihua Tang

    2. Xinxiang Academy of Agricultural Sciences, Xinxiang, 453000, China

      Xiaoyi Wei, Feng Wei & Pei Sun

    3. Henan Academy of Agricultural Sciences, Zhengzhou, 450002, China

      Xiaomin Lu

    4. Hubei Collaborative Innovation Center for Grain Industry, Jingzhou, 434023, China

      Jihua Tang

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    1. Xiaoyi Wei
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    Correspondence to Jihua Tang.

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    Xiaoyi Wei and Xiaomin Lu have contributed equally to this work.

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    Wei, X., Lu, X., Zhang, Z. et al. Genetic analysis of heterosis for maize grain yield and its components in a set of SSSL testcross populations. Euphytica 210, 181–193 (2016). https://doi.org/10.1007/s10681-016-1695-1

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