Abstract
Evaluation of combining ability is a crucial process in hybrid breeding, and dissection of the genetic basis of combining ability will facilitate hybrid breeding. In this study, molecular markers significantly associated with general combining ability (GCA) of seven yield-related traits and the traits per se were detected in a set of maize introgression lines (ILs) under three environments. Totally 25 and 31 significant loci for GCA and the traits per se were commonly detected under multiple environments, respectively. Correlation analysis and comparison among these significant loci revealed that the genetic basis of GCA of these yield-related traits was generally different from that of the traits per se except for the trait of ear row number. In addition, GCA of the ILs was positively and significantly correlated to the total relative effects of significant GCA loci in the ILs in general, implying that the GCA loci identified in this study would be useful in molecular breeding. Correlation analysis also showed that the GCA of yield per plant was strongly correlated to the GCA of kernel number per row, ear length and 100-kernel-weight, thus these traits were more important in genetic improvement for GCA. Results in this study would provide useful information for hybrid breeding in maize.
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Abbreviations
- EH:
-
Ear height
- EL:
-
Ear length
- GCA:
-
General combining ability
- ILs:
-
Introgression lines
- KN:
-
Kernel number per row
- KW:
-
100-Kernel weight
- PH:
-
Plant height
- QTL:
-
Quantitative trait loci
- RN:
-
Row number
- YP:
-
Yield per plant
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Acknowledgments
This work was financially supported by the National Natural Science Foundation of China (No: 30971791), Fundamental Research Funds for the Central Universities (Program No: 2012ZYTS055), and Hubei Provincial Natural Science Foundation (No: 2010CBB01902). The authors also thank Dr. Zuxin Zhang for kindly providing the seeds of the ILs.
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Juan Huang and Huanhuan Qi have contributed equally to this work.
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Huang, J., Qi, H., Feng, X. et al. General combining ability of most yield-related traits had a genetic basis different from their corresponding traits per se in a set of maize introgression lines. Genetica 141, 453–461 (2013). https://doi.org/10.1007/s10709-013-9744-3
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DOI: https://doi.org/10.1007/s10709-013-9744-3