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The Use of Population Subdivision in Effecting a Stratification of Gene Frequencies for Reaction in Alfalfa to Pseudopeziza medicaginis¹

Synopsis: Twelve 3-plant groups of alfalfa, composed at random from 36 plants that were uniformly resistant to common leafspot and randomly intercrossed within groups, produced progenies that differed significantly in mean reaction to the disease. This was interpreted to indicate that in critically-sized subdivisions of a breeder's population, the evolutionary force of chance can be employed to effect a gene frequency stratification of the population. The relationship of this effect to inbreeding was noted.

² Professor of Agronomy (now Associate Professor of Farm Crops, Michigan State University) and Professor of Plant Pathology, respectively, South Dakota State College, Brookings.