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  1. Vol. 25 No. 3, p. 529-532
     
    Received: Sept 17, 1984
    Published: May, 1985


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doi:10.2135/cropsci1985.0011183X002500030023x

Relationship Between Coefficient of Parentage and Genetic Similarity Indices in the Soybean1

  1. T. S. Cox,
  2. Y. T. Kiang,
  3. M. B. Gorman and
  4. D. M. Rodgers2

Abstract

Abstract

Estimates of genetic similarity or distance between populations or strains of plants are useful in planning crosses for hybrid or pureline cultivar development. We compared coefficients of parentage (r) and similarity indices (s, sz, and sM, based on 20, 13, and 7 genetic loci, respectively) for combinations of 115 soybean [Glycine max (L.) Merr.] cultivars and ancestral introductions. Correlations between r and s were higher than those between r and sz or sM, primarily because s includes information from more loci. The correlation between r and s was higher for the group of soybean cultivars released in the 1970s than for earlier cultivar groups, primarily because of the greater importance of identity by descent relative to identity in phenotype in determining s. The most useful estimate of genetic relationship is a composite index that includes both r and s.

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