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Genetic Drift and Selection Evaluated From Recurrent Selection Programs in Maize

Crop and Weed Science Dep., North Dakota State Univ., Fargo, ND 58105
USDA-ARS, Dep. Agronomy, Iowa State Univ., Ames, IA 50011
Pioneer Hi-Breed Intl., Inc., Johnston, IA 50131

^* Corresponding author.

If recurrent selection methods are effective, the frequency of favorable alleles is expected to increase in the population. Random changes in gene frequency will also occur, if effective population size is small, due to the effect of sampling. In maize (Zea mays L.), where dominance gene action is positive in direction for traits such as grain yield, genetic drift results in inbreeding depression. Genetic drift is the change in gene frequency due to sampling in a finite population. Two major processes are expected to be operating to change the mean over cycles of recurrent selection in a population of finite size, selection acting to increase the mean and inbreeding depression due to genetic drift acting to decrease the mean. Estimation of the effects of genetic drift may be useful because the choice of what constitutes adequate effective population size may be altered, on the basis of empirical results. The objectives of the current study were to compare progress between reciprocal recurrent selection (RRS) and intrapopulation selection that included half-sib (HT) and S₂ (S) selection in ‘Iowa Stiff Salk Synthetic’ (BSSSC₀), and to separate the effects of selection from those of genetic drift. Effects due to selection for grain yield improvement of populations on a per-cycle basis were not significantly different between methods of recurrent selection. When advanced cycles were evaluated for grain yield in crosses with an unrelated inbred line (Mo17), improvements paralleled improvement in the populations. The improved populations crossed to an unrelated population [BSCB1(R)C_n], which was used reciprocally as the tester for BSSS(R)C_n, suggested that response to RRS in improving the population cross mean was similar to the populations improved by either HT or S methods of selection. Effects of genetic drift were significant and should be considered in long-term selection programs. Differences among selection methods for genetic drift were not significant.

Received for publication April 4, 1988.

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