Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 7:99-103 (1967)
© 1967 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Evaluation of a Population of Soybean Genotypes With Implications for Improving Self-Pollinated Crops1

W. D. Hanson, A. H. Probst and B. E. Caldwell2

Eight improved soybean lines constituted the base of a random intermating population from which a population of homozygous genotypes was obtained. A family structure was maintained in the selfing generations. The genetic variability found was generally larger than that reported for two parent crosses. Considerable epistatic variability was suggested for seed yield, maturity, and percent mottling. The relative proportions for genetic variability partition were not affected when levels of environmental sampling, ranging from within environments to among environments in Maryland and Indiana, were considered. Concepts for improving a base population of homozygous lines through recurrent selection and intermixing were developed. Such an intermating system provided for stepwise improvement yet minimized the coefficient of parentage among breeding lines. The expected improvement in the base population resulting from intercrossing of the superior lines was developed. Selecting the top 20 lines (5%), intermating, and selfing in this study yielded a predicted 235 kg/ha (3.5 bu/A) gain over the base population mean. With epistatic variability, as suggested for seed yield, considerations for isolating unique genetic combinations become important. The importance of creating populations where geneticrecombinations could potentially occur was discussed.

Key Words: soybeans • glycine max • self-pollinators • intermated populations • genetic variability • epistatic variability

1 Contribution from the North Carolina and the Indiana Agricultural Experiment Stations and the Crops Research Division, ARS, USDA. Published with the approval of the Directors of Research, North Carolina Agricultural Experiment Station, as Journal Paper No. 2140, and Indiana Agricultural Experiment Station, as Journal Paper No. 2749. U. S. Regional Soybean Laboratory Paper No. 445. This research was supported in part by NIH Grant No. 11546-01. The computing services for this research were provided by NIH Grant No. FR-0011.

2 Department of Genetics, N. C. State University, Raleigh, N. C.; Crops Research Division and Department of Agronomy, Purdue University, Lafayette, Ind.; and the Crops Research Division, Beltsville, Md.

Received for publication April 15, 1966.




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Environmental Quality		 The Plant Genome
Copyright © 1967 by the Crop Science Society of America.