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Performance of Pure Lines Obtained from Superior-yielding Heterogeneous Lines in Soybeans¹

F₂–derived heterogeneous parental-fines (HPL) were selected for high seed yield, based on F₃, F₃–F₄, and F₃–F₄–F₅ combined generation means in four soybean [Glycine max (L) Merr.] crosses. In the F₅ generation, 30 pure lines (PL) were isolated from each of the nine selected HPL.

A comparison of seed yields of HPL and their unselected PL indicated that either an overcompensation, undercompensation, or additive effect was responsible for seed yield of the nine selected HPL A nonadditive effect was responsible for the lodging score of one HPL.

A comparison of seed yields and maturities of selected HPL and their selected PL indicated that in one HPL, PL could be isolated that were significantly higher in seed yield and earlier in maturity. In the other HPL, PL were isolated that were earlier in maturity while being equal in yield to the HPL. These results are discussed in relation to the bulk and early-generation yield testing selection procedures.

Key Words: Glycine max (L.) Merr. • Seed yield • Overcompensation effects • Undercompensation effects • Additive effects • Nonadditive effects • Bulk selection procedure • Early-generatlon yield testing selection procedure

² Assistant professor. Dep. of Agron., College Station, U. of Ga., Athens, GA 30602 and research agronomist, U.S. Regional Soybean Lab., ARS, USDA, and professor, Dep. of Agron., U. of Ill, Urbana, IL 61801, respectively.

Received for publication August 30, 1974.

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