Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 12:602-604 (1972)
© 1972 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Commercial Utilization of the Products of Recurrent Selection for Specific Combining Ability in Maize1

E. S. Horner, W. H. Chapman, H. W. Lundy and M. C. Lutrick2

Commercial maize (Zea mays L.) hybrids can be generated rapidly from a program of recurrent selection for specific combining ability when the tester is a seed parent already in commercial use. The pollen parent can be an inbred line, a single cross, or a synthetic derived from lines selected in a given cycle. A study was made to compare the three types of parents listed above. Six lines, selected in the fifth cycle of selection for combining ability with the single cross F44 x F6, were evaluated as pollen parents individually (three-way crosses), in singlecross combinations (double crosses), and as a six-line synthetic (top cross). These types of crosses averaged 48.7, 47.7, and 47.6 quintals/ha, respectively, at five locations over a 2-year period. There was no statistically significant difference for average grain yield or lodging among types of hybrids nor between the top cross and any of the three-way or double crosses. The top cross was as uniform for silking date and ear height as a single cross and a commercial double cross. Since a top cross of this type can be released more quickly and economically than a three-way or double cross, we conclude that its use in commercial hybrids would be justified.

Key Words: Corn • Epistasis • Top cross • Synthetic variety • Zea mays L.

1 Contribution of the Florida Agricultural Experiment Stations, Institute of Food and Agricultural Sciences, University of Florida, Gainesville, Fla. Journal Series paper no. 4298.

2 Agronomist, Department of Agronomy; Agronomist and Center Director, Agricultural Research and Education Center, Quincy, Fla.; Associate Agronomist and Center Director, Agricultural Research Center, Live Oak; and Associate Soils Chemist, Agricultural Research Center, Jay, Fla.

Received for publication January 26, 1972.




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