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Association between line per se and testcross performance for eight agronomic and quality traits in winter rye

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We investigated associations between line per se and testcross performance in rye and suggested that selection for per se performance is valuable for several traits in multi-stage selection programs.

Abstract

Genotypic correlation between line per se and testcross performance is an important quantitative-genetic parameter for optimizing hybrid breeding programs. The main goal of this survey was to study the association of line per se and testcross performance at the phenotypic level. We used experimental data from the line per se and testcross performance of two segregating winter rye populations (A, B) with each of 220 progenies tested in six environments for eight agronomic and quality traits. Genotypic variances were considerably larger for per se than for testcross performance of all investigated traits resulting in higher heritabilities of the former in most instances. Genotypic correlations (r g) between testcross and line per se performance decreased with increasing complexity of the trait as shown by the respective heritabilities. They were highest (r g ≥ 0.7) for plant height and test weight in population B, and thousand-kernel weight, falling number and starch content in both populations. A selection of these traits for line per se performance in early generations will save field plots in further testing testcross performance and increase efficiency of hybrid breeding.

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Acknowledgments

We highly appreciate the contribution of M.Sc. Brigitta Schmiedchen and M.Sc. Pawel Dopierala, both KWS LOCHOW GMBH, concerning the technical realization of the experiments in Petkus and Walewice/PL, respectively. This research was conducted within the project “Genetische Architektur der Eigen- versus Testkreuzungsleistung für wichtige agronomische Merkmale beim Roggen” financially supported by the “Deutsche Forschungsgemeinschaft”, Bonn (DFG Grant ID:MI 519/1-1).

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The authors declare that they have no conflict of interest.

Ethical standards

The experiments reported in this study comply with the current laws of Germany.

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Correspondence to Thomas Miedaner.

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Communicated by T. Lubberstedt.

T. Miedaner and D. D. Schwegler contributed equally to this work.

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Miedaner, T., Schwegler, D.D., Wilde, P. et al. Association between line per se and testcross performance for eight agronomic and quality traits in winter rye. Theor Appl Genet 127, 33–41 (2014). https://doi.org/10.1007/s00122-013-2198-2

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  • DOI: https://doi.org/10.1007/s00122-013-2198-2

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