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Published in Crop Sci 24:355-357 (1984)
© 1984 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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A Method of Identifying Lines for Use in Improving Parents of a Single Cross1

J. W. Dudley2

A method for identifying inbred lines containing dominant alleles affecting a quantitative trait, which are not already present in an elite single cross, was developed. If the elite single cross is designated P1 x P2 and the lines to be tested Pw, the expression µG = [(P1 x Pw) + (P2 x Pw) – P1 – P2 – Pw – (P1 x P2)]/4 is an estimate of the relative number of loci in Pw which contain favorable alleles not present in P1 or P2. Results from applying the method to a set of corn (Zea mays L.) grain yield data suggest the method may be useful in applied breeding programs.

Key Words: Zea mays L. • Quantitative genetics • Corn breeding

1 Contribution from the Agronomy Dep., Univ. of Illinois, Urbana. Supported by funds from the Illinois Agric. Exp. Stn.

2 Professor of plant genetics, Agronomy Dep., Univ. of Illinois, Urbana, IL 61801.

Received for publication May 26, 1983.


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