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Frequency Changes of Isozyme Alleles in a Selection Experiment for Grain Yield in Maize (Zea mays L.)¹

Frequencies of alleles associated with three peroxidase isozyme systems and one acid phosphatase system were monitored through nine cycles in a maize (Zea mays L.) selection program for grain yield that originated from (NC7)x CI21) syn 2. The same isozymes were also evaluated in an unselected population following 20 generations of random mating of (NC7)x CI21) syn 2. for the three peroxidase systems the dominant alleles became fixed in both the unselected and selected populations.

Two codominant alleles (F and S) were found in the acid phosphatase system with the heterozygote exhibiting two parental bands and an intermediate hybrid band. Frequency of the F allele increased from 0.50 to 0.76 in the first six cycles of selection; however, it now appears that the population is approaching a stable intermediate frequency (0.60). Although the changes in frequencies suggest an association of this acid phosphatase locus with yield, close linkage with another "yield" locus cannot be ruled out.

Key Words: Peroxidase • Acid phosphatase • Full-sib family selection

² Research Geneticist, PSRD, ARS, USDA, and Associate Professor of Genetics, N. C. State University; and Professor of Genetics, N. C. State University, respectively.

Received for publication November 11, 1971.

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