Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 9:699-702 (1969)
© 1969 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Correlated Truncation Selection for Yield in Soybeans1

D. E. Byth, C. R. Weber and B. E. Caldwell2

Random genetically heterogeneous, F2-derived maternal lines and genetically homogeneous, F5-derived daughter lines of two soybean crosses were evaluated for nine characters in three environments in the F0-F7 generations.

Heritability was relatively consistent across environments for all traits except seed yield. For yield, heritability was greatest under favorable growth conditions and least when moisture stress was alleviated by irrigation. Variability over environments in correlations of all traits with yield was related largely to the degree of moisture stress in each environment. Crosses revealed similar magnitudes of correlation with yield for all traits except chemical composition. This was related to the chemical composition of parents used in these crosses. Correlations of early lodging with yield in genetically homogeneous lines were generally greater than for genetically heterogeneous lines. This was related to the relative uniformity of the plant canopy in these populations.

Because of the inconsistency in character associations, predictions of yield advance from selection in any environment were inaccurate estimates of actual advance evaluated over environments. Selection of yield invariably resulted in maximum actual yield advance. Chemical composition was generally the best yield predictor for heterogeneous lines, while early lodging was the most effective trait for correlated yield selection in genetically homogeneous lines.

Key Words: Glycine max (L.) Merrill • Selection procedures • Genetics • Breeding

1 Joint contribution from Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, as No. 537 of the U.S. Regional Soybean Laboratory, and the Iowa Agricultural and Home Economics Experiment Station, Ames, Iowa, as Journal Paper No. J-5913, Project No. 1179.

2 Senior Lecturer, Department of Agriculture, University of Queensland, Brisbane, Australia, (formerly Graduate Assistant and CSIRO Student, Agronomy Department, Ames, Iowa); Director of Research, Peterson Seed Co., Waterloo, Iowa, and Savage, Minn., (formerly Agronomist, Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, and Professor of Agronomy, Iowa State University, Ames, Iowa); and Agronomist, Crops Research Division, Agricultural Research Service, U.S. Department of Agriculture, Beltsville, Md. 20705, respectively.

Received for publication August 6, 1968.




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Copyright © 1969 by the Crop Science Society of America.