Abstract
Prediction methods to identify single-cross hybrids with superior yield performance have the potential to greatly improve the efficiency of commercial maize (Zea mays L.) hybrid breeding programs. Our objectives were to (1) identify marker loci associated with quantitative trait loci for hybrid performance or specific combining ability (SCA) in maize, (2) compare hybrid performance prediction by genotypic value estimates with that based on general combining ability (GCA) estimates, and (3) investigate a newly proposed combination of the GCA model with SCA predictions from genotypic value estimates. A total of 270 hybrids was evaluated for grain yield and grain dry matter content in four Dent × Flint factorial mating experiments, their parental inbred lines were genotyped with 20 AFLP primer-enzyme combinations. Markers associated significantly with hybrid performance and SCA were identified, genotypic values and SCA effects were estimated, and four hybrid performance prediction approaches were evaluated. For grain yield, between 38 and 98 significant markers were identified for hybrid performance and between zero and five for SCA. Estimates of prediction efficiency (R 2) ranged from 0.46 to 0.86 for grain yield and from 0.59 to 0.96 for grain dry matter content. Models enhancing the GCA approach with SCA estimates resulted in the highest prediction efficiency if the SCA to GCA ratio was high. We conclude that it is advantageous for prediction of single-cross hybrids to enhance a GCA-based model with SCA effects estimated from molecular marker data, if SCA variances are of similar or larger importance as GCA variances.
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Acknowledgments
This 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 thank Dr. J. Muminovic for helpful comments on this manuscript. The staff at the Plant Breeding Research Station at Eckartsweier and Hohenheim is gratefully acknowledged for conducting the field experiments. We greatly appreciate the helpful comments and suggestions of two anonymous reviewers.
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Communicated by H. C. Becker
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Schrag, T.A., Melchinger, A.E., Sørensen, A.P. et al. Prediction of single-cross hybrid performance for grain yield and grain dry matter content in maize using AFLP markers associated with QTL. Theor Appl Genet 113, 1037–1047 (2006). https://doi.org/10.1007/s00122-006-0363-6
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DOI: https://doi.org/10.1007/s00122-006-0363-6