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Effect of Natural Selection on Performance of a Barley Population¹

A barley composite population obtained by mixing seed of 6,000 entries from the barley world collection was grown under severe stress, imposed by late planting, in Minnesota for 6 years. During this time the composite was advanced using a random lot of seed from the previous year's harvest. Remmant seed from each year ultimately was planted in yield trials to ascertain the change, if any, in the yield potential of the composite.

Yield of the population increased significantly indicating a substantial response to natural selection. The improvement amounted to 57% during the six years or an average of 9.5% for each year of natural selection.

² Professor in Agronomy and Plant Genetics, University of Minnesota; Research Agronomist, Crops Research Division, ARS, USDA; and Research Agronomist, Cargill Incorporated.

Received for publication March 22, 1967.