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Published in Crop Sci 11:502-507 (1971)
© 1971 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Recovery of the Recurrent Parent Phenotype During Backcrossing in Soybeans1

J. R. Wilcox, A. H. Probst, K. L. Athow and F. A. Laviolette2

Soybean [Glycine max (L.) Merr.] lines resistant and susceptible to Phytophthora megasperma Drechs. var. sojae A. A. Hildeb., selected in successive backcross generations, were evaluated for maturity, height, lodging, seed size, yield, and oil and protein content. Recovery of the phenotype of the recurrent parent was generally slower than predicted, assuming only additive genetic control of agronomic characteristics. Deviations from predicted performance were probably due to continued segregation for genes controlling the expression of these characteristics and the limited sample (4 to 8 lines) used to evaulate each generation.

Resistant selections were 3 to 6 cm taller and lodged more than susceptible selections. The shorter plant height of susceptible selections may be due to insidious infection. The increase in lodging of resistant selections may be a reflection of increased plant height or vigor due to resistance.

Implications of these results on backcross breeding of soybeans are discussed.

Key Words: Glycine max (L.) Merr. • Phytophthora megasperma Drechs. var. sojae A. A. Hildeb. • Disease resistance • Selection • Breeding

1 Cooperative Investigations of the Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, and the Purdue University Agricultural Experiment Station. Journal Paper No. 4154 of the Purdue University Agri. Exp. Sta. and Publication No. 660 of the U. S. Regional Soybean Laboratory.

2 Research Geneticist and Research Agronomist, Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, and Associate Professor and Professor of Agronomy, and Professor and Assistant Professor of Botany and Plant Pathology, respectively, Purdue University, Lafayette, Ind. 47907.

Received for publication November 18, 1970.




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