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Selection to Modify Sugar Content of Soybean Seeds¹

The objectives of this study were to investigate the inheritance of sugar concentration in soybean [Glycine max (L.) Merr.] seeds and the effect of selection for that trait on protein and oil concentration, weight, and yield of seeds. We studied the F₂, F₃, and F₄ generations of one cross and the F₂ and F₃ of another. Heritability estimates of sugar concentration based on parent-progeny regressions were 0.38 and 0.14 when selection was based on individual F₂ plants and 0.69 when selection was based on F₃ progeny means. The values agreed well with estimates based on variance components and with realized heritabilities. In one cross, realized heritabilities were greater for increased than for decreased sugar. There was no indication of genotype x year interaction for sugar content. Sugar was positively associated with oil and negatively associated with protein and the sum of oil + protein. In some generations, low sugar was associated with decreased yield.

Key Words: Correlated response • Oil • Protein • Glycine max (L.) Merr.

² Former graduate research assistant (present address: Pfizer Genetics, 1000 Bellerive Executive parkway, St. Louis, MO 63141) and professor of plant genetics, respectively.

Received for publication August 4, 1980.

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