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This article in CS

  1. Vol. 24 No. 1, p. 1-4
    Received: May 17, 1982

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Selection Indexes to Modify Protein Concentration of Soybean Seeds1

  1. S. J. Openshaw and
  2. H. H. Hadley2



The purpose of this study was t~a investigate the effectiveness of selection based upon selection indexes to modify protein concentration of soybean [Glycine max (L.) Merr.] seeds. Selection criteria were compared by evaluating F4 performance of F2- derived lines identified in the F3 as being in the upper 10% of the population. Smith-Hazel indexes designed to maximize the gain in protein by including oil or oil and sugar as secondary traits were not more effective than direct selection, which resuited in changes of 1.42% protein and −1.14% oil. Smith-Hazel indexes which gave protein and oil equal economic weights, either including or not including sugar as a secondary trait, and a desired gains index with desired gains set at 1.0% protein and 0.25% oil were all similar in results to selection based on the sum of protein + oil. Among these methods, changes ranged from 0.15 to 0.31% for protein anti from −0.01 to 0.19% for oil. An index designed to change protein by 1.25% and oil by −0.75% produced observed changes of 1.31 and −0.81%. An index designed to increase protein as much as possible while holding oil constant resulted in changes of 0.45% protein and −0.13% oil. This index was more effective than selection for protein following culling oil at the mean, which resulted in little change for either trait.

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