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Published in Crop Sci 13:363-364 (1973)
© 1973 Crop Science Society of America
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Bulk, Pedigree, and Early Generation Testing Breeding Methods Compared in Soybeans1

V. D. Luedders, L. A. Duclos and A. L. Matson2

Soybean (Glycine max (L.) Merr.) lines selected from populations advanced by the pedigree, early generation (F4 and F5) testing, and 2 bulk methods were evaluated in the F6 and F7. Differences in the yield of these lines due to method of generation advance were not significant. However, with selection on 2-year means and in each individual year, the complete bulk (CB) and early generation testing (EGT) methods retained a few more lines than the maturity bulk (MB) and pedigree (P) methods. Methods of generation advance were highly significant for four character-population combinations but these appeared to occur at random except for seed quality-maturity in population 6. This association was not unexpected because seed quality and later maturity are significantly correlated in 14 out of 24 cases. Heritability estimates ranged from 10 to 40% for yield, 29 to 88% for height, and 23 to 72% for lodging.

We suggest that plant breeders discard approximately 75% of their yield-tested lines each year. This would permit larger populations to be evaluated and should result in the retention of more stable high-yielding lines.

Key Words: Glycine max (L.) Merr. • Generation advance

1 Contribution from the Missouri Agricultural Experiment Station and the Agricultural Research Service, USDA. Journal Paper No. 6549 of the Missouri Agricultural Experiment Station.

2 Research Agronomist, ARS, USDA, and Research Associate, University of Missouri, Columbia, 65201; Associate Professor of Agronomy, University of Missouri, Delta Research Station, Portageville; and former Assistant Professor of Agronomy, University of Missouri, Delta Research Station, Portageville (now Soybean Breeder, Soybean Research Foundation, Mason City, Ill.); respectively.

Received for publication December 22, 1972.




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