Optimum breeding strategies using genomic selection for hybrid breeding in wheat, maize, rye, barley, rice and triticale
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A breeding strategy with moderate nursery selection followed by genomic selection and one-stage phenotypic selection maximizes annual selection gain for grain yield across a wide range of hybrid breeding scenarios.
Genomic selection (GS) is a promising method for the selection of quantitatively inherited traits but its most effective implementation in routine hybrid breeding schemes requires further research. We compared five breeding strategies and varied their available budget, the costs for doubled haploid (DH) line and hybrid seed production as well as variance components for grain yield in a wide range. In contrast to previous studies, we included a nursery selection for disease resistance just before GS on grain yield. The breeding strategy GSrapid with moderate nursery selection followed by one stage GS and one final stage with phenotypic selection on grain yield had the highest annual selection gain across all strategies, budgets, costs and variance components considered and we, therefore, highly recommend its use in hybrid breeding of cereals. Although selecting on traits not correlated with grain yield in the observation nursery, this selection reduced the selection gain of grain yield, especially in the breeding schemes with GS and for selected fractions smaller than 0.3. Owing to the very high number of test candidates entering breeding strategies with GS, the costs for DH line production had a larger impact on the annual selection gain than the hybrid seed production costs. The optimum allocation of test resources maximizing annual selection gain in classical two-stage phenotypic selection on grain yield and for the recommended breeding strategy GSrapid is finally explored for maize, wheat, rye, barley, rice and triticale.
KeywordsDoubled Haploid Cytoplasmic Male Sterility Genomic Selection Doubled Haploid Line General Combine Ability
This research was conducted with the financial support provided by the German Academic Exchange Service (DAAD) to J. J. Marulanda in the frame of the program “PhD Scholarships for international students”. Model calculations for rice in this paper were supported by National High Technology Research and Development Program of China (863 Program: 2014AA10A601) and Shenzhen Peacock Plan. The authors thank Prof. T. Miedaner and Dr. H. P. Maurer to provide valuable information about costs and budget estimates for rye and triticale. We thank two anonymous reviewers for their useful and constructive comments on the manuscript.
Compliance with ethical standards
The authors declare that the experiments comply with the current laws of Germany.
Conflict of interest
The authors declare that they have no conflict of interest.
- Becker H (2011) Pflanzenzüchtung (in German). Eugen Ulmer, StuttgartGoogle Scholar
- Bernal-Vazquez A, Gordillo GA, Schmidt M, Piepho H-P (2015) Genomic selection in a hybrid rye breeding program using historical data: An approach considering genotype by year interaction. In: Poster presented at the XVIth meeting of the EUCARPIA section biometrics in plant breeding. WageningenGoogle Scholar
- Cochran WG (1951) Improvement by means of selection. In: Proceedings of the second Berkeley symposium on mathematical statistics and probability. University of California, pp 449–470Google Scholar
- Melchinger AE, Longin CFH, Utz HF, Reif JC (2005) Hybrid maize breeding with doubled haploid lines: quantitative genetic and selection theory for optimum allocation of resources. In: Proceedings of the 41st annual Illinois corn breeders school. Urbana-Champaign, pp 8–21Google Scholar
- R Development Core Team (2016) R: a language and environment for statistical computing. Vienna: R Foundation for Statistical Computing. http://www.r-project.org. Accessed March 2016
- Tomerius A-M (2001) Optimizing the development of seed-parent lines in hybrid rye breeding. Dissertation. University of HohenheimGoogle Scholar
- Utz HF (1969) Mehrstufenselektion in der Pflanzenzüchtung (In German). Eugen Ulmer, StuttgartGoogle Scholar
- Verstegen H, Köneke O, Korzun V, von Broock R (2014) The world importance of Barley and challenges to further improvements. In: Kumlehn J, Stein N (eds) Biotechnological approaches to Barley improvement. Springer, Berlin, pp 3–19Google Scholar
- Virmani SS, Sun ZX, Mou TM et al (2003) Two-line hybrid rice breeding manual. International Rice Research Institute, Los BañosGoogle Scholar