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  1. Vol. 26 No. 3, p. 469-472
     
    Received: Feb 19, 1985
    Published: May, 1986


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doi:10.2135/cropsci1986.0011183X002600030006x

Relationship between Seed-Filling Period and Yield among Soybean Breeding Lines1

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

Abstract

Abstract

It has been suggested that seed-filling period (SFP) and seed yield are positively related in soybeans [Glycine max (L.) Merr.]. The purpose of this study was to evaluate the relationship between seed yield and SFP among F5 lines. Estimates of SFP were also made in the F4 and F5 generations, and a reproductive period estimate was also made in the F2. All genotypes came from the cross ‘Williams’ ✕ ‘Kanrich’ and were selected for differences in SFP. Replicated yield and SFP data were taken in 1982 and 1983; soil types for those years were a Drummer silty clay loam (Typic Haplaquall) and a Catlin silt loam (Typic Argiudoll), respectively. Data taken in the F2 and F4 were on single plants and those taken in the F5 were on unreplicated rows. The relationship between reproductive period in the F2 and combined 1982 and 1983 yield data was nonexistent (r = 0.00), while that between SFP in the F4 and F5 and the combined 1982 and 1983 yield data was significantly positive. Within 1982 and 1983, in three maturity groups, a positive relationship between yield and four estimates of SFP was found in most cases, the exception being Maturity Group II lines in 1983. In addition, the three highest yielding lines, over years and maturity groups, all came from F4 plants selected as having a long SFP in the F4 generation. These data suggest a positive relationship between SFP and yield and that progress for yield may be made by selecting for SFP.

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