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Exotic Germplasm for Yield Improvement in 2-way and 3-way Soybean Crosses¹

We evaluated homozygous populations froin 2-way adapted x exotic and 3-way (adapted x exotic) x adapted soybean (Glycine max (L.) Merrill) crosses for seed yield. The average yield of our 3-way populations was significantly greater than the 2-way population mean, but differences were not significant in some 2-, 3-way sets. Mean population performance was generally predictable from parental performance, although a masking inhence of genes from the third parent was observed in the 3-way crosses.

Estimates oC genetic variance for 3-way populations generally were larger than for 2-way populations for yield. Transgressive segregation was observed in all populations, but in most 2-, 3-way sets, the 3-way cross produced more of the superior lines for yield than the 2-way cross.

Key Words: Genetic variability • Transgressive segregation • Selection • Glycine max (L.) Merrill

² Research Associate, Department of Agronomy, Iowa State University (present address: Northrup, King and Company, Washington, Iowa); and Assistant Professor of Agronomy and Collaborator, Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, Iowa State University.

Received for publication May 14, 1970.

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