Abstract
Key message
A mixed model framework was defined for QTL analysis of multiple traits across multiple environments for a RIL population in pepper. Detection power for QTLs increased considerably and detailed study of QTL by environment interactions and pleiotropy was facilitated.
Abstract
For many agronomic crops, yield is measured simultaneously with other traits across multiple environments. The study of yield can benefit from joint analysis with other traits and relations between yield and other traits can be exploited to develop indirect selection strategies. We compare the performance of three multi-response QTL approaches based on mixed models: a multi-trait approach (MT), a multi-environment approach (ME), and a multi-trait multi-environment approach (MTME). The data come from a multi-environment experiment in pepper, for which 15 traits were measured in four environments. The approaches were compared in terms of number of QTLs detected for each trait, the explained variance, and the accuracy of prediction for the final QTL model. For the four environments together, the superior MTME approach delivered a total of 47 regions containing putative QTLs. Many of these QTLs were pleiotropic and showed quantitative QTL by environment interaction. MTME was superior to ME and MT in the number of QTLs, the explained variance and accuracy of predictions. The large number of model parameters in the MTME approach was challenging and we propose several guidelines to help obtain a stable final QTL model. The results confirmed the feasibility and strengths of novel mixed model QTL methodology to study the architecture of complex traits.
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Notes
The list of all abbreviations is given in Table 5 in Appendix A.
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Acknowledgments
The research leading to these results has received funding from the European Community’s Seventh Framework Programme (FP7/2007-2013) under grant agreement n° 211347. We thank the EU-SPICY Industrial Advisory Board for support and discussions. Rik van Wijk and Syngenta are especially acknowledged for their highly valuable help in making available additional SNP markers that strongly improved the quality of the genetic map. Roeland Voorrips and other members of the EU-SPICY project are acknowledged for their contributions and helpful comments. We also thank Paul Keizer, Marcos Malosetti and Martin Boer of Biometris for their valuable insights.
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The authors declare that they have no conflict of interest.
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The authors declare that the experiments in this study comply with the current laws of the countries (Spain and Netherlands) in which the experiments were performed.
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Communicated by I. Mackay.
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Alimi, N.A., Bink, M.C.A.M., Dieleman, J.A. et al. Multi-trait and multi-environment QTL analyses of yield and a set of physiological traits in pepper. Theor Appl Genet 126, 2597–2625 (2013). https://doi.org/10.1007/s00122-013-2160-3
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DOI: https://doi.org/10.1007/s00122-013-2160-3