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This article in CS

  1. Vol. 10 No. 6, p. 652-655
     
    Received: Apr 30, 1970


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doi:10.2135/cropsci1970.0011183X001000060012x

Incorporation of High-Protein, Exotic Germplasm into Soybean Populations by 2- and 3-way Crosses1

  1. J. C. Thorne and
  2. W. R. Fehr2

Abstract

Abstract

Exotic high-protein parents were studied as sources of variability for protein, oil, and protein + oil in soybean (Glycine max (L.) Merrill) populations derived from 2- and 3-way crosses. Random lines from homozygous 2-way adapted × exotic and 3-way (adapted × exotic) × adapted soybean crosses were evaluated. Significant genetic variability was detected for the three characters in each population. The high protein content of the exotic strains was transmitted readily to their offspring; and selection of high-yielding, high-protein strains from crosses involving exotic strains was possible.

Both 2- and 3-way population means were determined primarily by additive effects, but instances of epistatic effects were noted. The rank of population means was predictable from parental performance.

Genetic variance estimates, heritabilities, and correlations between characters were similar for our 2- and 3- way populations. The 3-way populations generally had significantly higher mean protein, oil, and protein + oil than the 2-way populations and were more useful sources for selection of all characters. Selection for protein + oil was successful in increasing the protein level of the population while maintaining the oil content at the level of the unselected population.

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