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Published in Crop Sci 20:499-501 (1980)
© 1980 Crop Science Society of America
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Response of Soybean Populations to Inbreeding Under Two Photoperiods1

Tuneo Sediyama and J. R. Wilcox2

Three soybean [Glycine max (L.) Merr.] populations were advanced four generations by single seed descent (SSD) under a 12 and 14-hour photoperiod. The objective was to determine if the populations differed for seed yield plant maturity, height, and lodging, when advanced under these two photolperiods.

Advancing the three populatmns by single seed descent did not result in significantly different population means or variances for seed yields, maturity, plant height, or lodging under these photoperiods. However, early maturing determinate segregates in one cross did not survive under the 14-hour photoperiod. Distribution of lines did vary in some crosses, with skewness toward early maturing and low yielding lines in two crosses and toward high lodging scores in one cross. However, these deviations from normal distributions were not consistently associated with photoperiod. The data indicated that advancing these populations four generations by SSD under these two photoperiods did not result in consistent changes in the populations for these agronomically important characteristics.

Key Words: Glycine max (L.) Merr. • Single seed descent • Breeding method • Natural selection

1 Cooperative investigations of the AR, SEA, USDA and Purdue Univ. Agric. Exp. Stn. Journal Paper No. 7852 of the Purdue Univ. Agric. Exp. Stn., W. Lafayette, IN 47907.

2 Formerly graduate student, Dep. of Agronomy, Purdue Univ. (now professor of agronomy, Departamento de Fitotecnia, Universisdade Federal De Vicosa, 36.570 — Vicosa, Minas Gerais, Brazil); and research geneticist, AR, SEA, USDA and professor of agronomy, Purdue Univ., W. Lafayette, IN 47907, respectively.

Received for publication November 16, 1979.




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