Abstract
The identification of superior hybrids is important for the success of a hybrid breeding program. However, field evaluation of all possible crosses among inbred lines requires extremely large resources. Therefore, efforts have been made to predict hybrid performance (HP) by using field data of related genotypes and molecular markers. In the present study, the main objective was to assess the usefulness of pedigree information in combination with the covariance between general combining ability (GCA) and per se performance of parental lines for HP prediction. In addition, we compared the prediction efficiency of AFLP and SSR marker data, estimated marker effects separately for reciprocal allelic configurations (among heterotic groups) of heterozygous marker loci in hybrids, and imputed missing AFLP marker data for marker-based HP prediction. Unbalanced field data of 400 maize dent × flint hybrids from 9 factorials and of 79 inbred parents were subjected to joint analyses with mixed linear models. The inbreds were genotyped with 910 AFLP and 256 SSR markers. Efficiency of prediction (R 2) was estimated by cross-validation for hybrids having no or one parent evaluated in testcrosses. Best linear unbiased prediction of GCA and specific combining ability resulted in the highest efficiencies for HP prediction for both traits (R 2 = 0.6–0.9), if pedigree and line per se data were used. However, without such data, HP for grain yield was more efficiently predicted using molecular markers. The additional modifications of the marker-based approaches had no clear effect. Our study showed the high potential of joint analyses of hybrids and parental inbred lines for the prediction of performance of untested hybrids.
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Acknowledgments
This article is dedicated to Prof. Dr. H. F. Utz on the occasion of his 70th birthday. The project was supported by the German Research Foundation DFG in the framework program ‘Heterosis in Plants’ (research grants FR 1615/3-1 and 3-3). We gratefully acknowledge the staff at the Plant Breeding Research Station at Eckartsweier and Hohenheim for conducting the field experiments and Christine Beuter for skilled technical assistance in the SSR marker lab. We thank Keygene N.V. for providing the AFLP marker data and mapping information. We thank the anonymous reviewers for their helpful comments and suggestions.
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Communicated by A. Charcosset.
Contribution to the special issue ‘Heterosis in Plants’.
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Schrag, T.A., Möhring, J., Melchinger, A.E. et al. Prediction of hybrid performance in maize using molecular markers and joint analyses of hybrids and parental inbreds. Theor Appl Genet 120, 451–461 (2010). https://doi.org/10.1007/s00122-009-1208-x
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DOI: https://doi.org/10.1007/s00122-009-1208-x