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Multi-trait and multi-environment QTL analyses of yield and a set of physiological traits in pepper

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Abstract

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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

  1. 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.

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical standard

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.

Author information

Authors and Affiliations

Authors

Corresponding author

Correspondence to F. A. van Eeuwijk.

Additional information

Communicated by I. Mackay.

Appendices

Appendix A

See Tables 5, 6, 7.

Table 5 Description of abbreviations used in the manuscript
Table 6 Trait genetic correlations between environments
Table 7 Trait variances in each environment

Appendix B

See Fig. 9.

Fig. 9
figure 9

Biplots for BLUEs and fitted trait values in each environment. NL1, NL2, SP1 and SP2 are the biplots of BLUE for the traits in each environment while NL1p, NL2p, SP1p and SP2p are the biplots for fitted values of each trait in each environment from the MTME QTL model. The cosine of the angle between the lines approximates the correlation between the traits they represent. The closer the angles are, the higher the correlations. Angles close to 90 or 270° reflect weaker correlations. In each environment, angles between traits are similar for biplots from BLUEs and fitted values. E.g. the biplot for NL1 and NL1p, show a strong relationship between DWF and NF, and a weak relationship between DWF and NLE. The lines enclosing the sample points in the biplots are known as convex hulls, representing the smallest convex set of the sample data

Appendix C: QTL by environment results from ME analyses

See Fig. 10, Table 8.

Fig. 10
figure 10

CIM Profile plot for all the traits in the multi-environment analyses. The top section shows the P-values of tests for QTL main effects. The bottom section shows heat maps along the genome for each environment, where blue means that the YW allele had a significant positive effect and red means that the CM334 allele had a significant positive effect in that environment. Many of the QTLs are constitutive i.e. consistent across environments with no crossover interaction except the QTL on chromosome 11 for LUE, Axl, SL and INL (colour figure online)

Table 8 Environment-specific QTL-effects for all traits in ME analysis

Appendix D: QTL effects from MT analyses

See Table 9.

Table 9 Trait-specific QTL-effects for MT analysis

Appendix E: QTL effects from MTME analyses: chromosomes 3–12

See Tables 10, 11, 12.

Table 10 Detected QTLs and Their effects for trait-environment combinations from MTME analysis: chromosomes 3, 4, 5 and 6
Table 11 Detected QTLs and their effects for trait-environment combinations from MTME analysis: chromosomes 7, 8, 9 and 10
Table 12 Detected QTLs and their effects for trait-environment combinations from MTME analysis: chromosomes 11 and 12

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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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