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  1. Vol. 27 No. 3, p. 471-474
     
    Received: July 2, 1986
    Published: May, 1987


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doi:10.2135/cropsci1987.0011183X002700030009x

Predicting Yield from Early Generation Estimates of Reproductive Growth periods in Soybean1

  1. James R. Smith and
  2. Randall L. Nelson2

Abstract

Abstract

Previous research has demonstrated positive relationship between reproductive growth periods and seed yield in soybean [Glycine max (L.) Merr.]. The purposed of this research was to evaluate predicted response in seed yield by selection for length of reproductive growth periods within early generation segregating populations. Two populations of 131 and 89 F2-derived lines were developed from crosses between experimental lines selected for differences in seed-filling period and were tested in the F3 and F4. Single-rowpl ots wereg rown in a randomized complete blocked design with two replications at Urbana, IL in 1984 and 1985. The soil type each year was a Flanagan silt loam (Aquic Argindolis) Reproductive growth periods were estimated as the difference between specific reproductive growth stages (R1, R4, R5, R7, and R8). Heritabilities were estimated by the regression coefficient of F4 generation lines on F3 generation lines. Genotypic correlations were calculated from the same offspring-parent relationship. Heritabilities and genotypic correlations was were used to predict gain from selection. Heritabilities for most of the reproductive growth periods were not higher than those for yield, and the genotypic correlations between yield and reproductive growth periods were generally small. The predicted gain in seed yield by selection for increases in reproductige growth periods, relative to selection for increases in seedy ield, was low in all cases. Early generation selection for reproductive growth periods was unreliable in identifying high yielding lines.

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