Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 16:5-8 (1976)
© 1976 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Recurrent Selection for Combining Ability with a Single-Cross Tester in Maize1

E. S. Horner, M. C. Lutrick, W. H. Chapman and F. G. Martin2

To obtain additional information on the effectiveness of recurrent selection for specific combining ability in maize (Zea mays L.), we evaluated seven cycles of selection for combining ability with the single-cross tester F44 x F6. Grain yield, lodging resistance, and low ear height were the main selection criteria.

Seed of the selected population from each cycle was stored and later evaluated for combining ability with the original tester, F44 x F6, and with an unrelated synthetig. The evaluation with F44 x F6 indicated that the seven cycles of selection resulted in 18% more grain yield, 9% lower ear height, and 35% less lodging. Performance was similar when the same selected populations were crossed with an unrelated synthetic. This suggests that gains for all traits resulted from increasing the frequency of genes with additive effects.

These results and others previously xeported for inbred testers suggest that narrow-base testers are effective for improving general as well as specific combining ability, and that it is possible to change such testers in a recurrent selection program with little loss in accumulated improvement.

Key Words: Corn • Zea mays L. • Grain yield • Lodging resistance • Ear height

1 Contribution from the Agronomy Dep., Institute of Food and Agricultural Sciences, Univ. of Florida, Gainesville, FL 32611, as Journal Series No. 5872.

2 Professor, Agronomy Dep.; associate professor, Agric. Research Center, Jay, Fla.; professor, Agric. Research and Education Center, Quincy, Fla; and associate professor, Statistics Dep., Univ. of Florida Gainesville, FL 32611, respectively

Received for publication April 18, 1975.




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