Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 20:809-811 (1980)
© 1980 Crop Science Society of America
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Effectiveness of Single Plant Selection During Successive Generations of Inbreeding in Soybeans1

J. R. Wilcox2 and W. T. Schapaugh, Jr.3

Phenotypically superior plants were selected in the F2 through the F4 generations in 12 soybean [Glycine max (L.) Merr.] crosses, three among superior soybean cultivars and nine between those cultivars and plant introductions. Seed from the selected plants within each cross was composited to form the bulk for the succeeding generation of selection. The objective was to determine how effective single plant selection would be in the heterogeneous bulk populations.

Visual selection for superior plants from the heterogeneous populations had no effect on seed yield. selected F4 bulks matured later than the unselected F2 populations in 7 of the 12 crosses and were taller than unselected F2 populations in 9 of the 12 crosses. Selected F4 bulks from crosses among the three cultivars lodged more than their F2 progenitors; however, only three F4 bulks from crosses between cultivars and plant introductions lodged more than the unselected F2 populations. The data indicated that even though tall, late maturing plants in these bulk populations appeared to be phenotypically superior, they were not superior in yield to the unselected bulks.

Key Words: Gylcine max (L.) Merr. • Bulk breeding • Visual selection • Seed yield

1 Cooperative investigations of AR, SEA, USDA, and the Purdue Univ. Agric. Exp. Stn. Journal Paper No. 7906 of the Purdue Univ. Agric. Exp. Stn.

2 Suprv. research geneticist, AR, SEA, USDA, and professor of agronomy, Purdue Univ., W. Lafayette, IN 47907.

3 Formerly graduate instructor in agronomy, Purdue Univ., now assistant professor of agronomy, Kansas State Univ., Manhattan, KS 66506.

Received for publication January 7, 1980.




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