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Published in Crop Sci 21:547-550 (1981)
© 1981 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Associations Among Pod Dimensions and Seed Weight in Soybeans1

S. J. Frank and W. R. Fehr2

Selection for seed weight among soybean [Glycine max (L.) Merr.] genotypes can be accomplished by indirect selection for width of mature pods. Our study was designed to evaluate additional variables that could influence the effectiveness of indirect selection for seed weight. The objectives were to determine the influence of number of seeds per pod on pod length, width, and thickness; to determine if measurements on full-size green pods were as effective for selection as measurements on mature pods; and to determine which pod dimensions would be most effective for indirect selection. Data were obtained on F4 plants and their progeny from six populations in three Iowa environments.

Number of seeds per pod had a significant effect on pod length, but was of no practical importance on pod width or thickness. Selection for pod length or width based on measurements of full-size green pods was as effective as selection based on mature pod dimensions. Selection for pod length or width was more effective than for pod thickness. Use of pod length or width alone was as effective for selection as evaluation for pod area or volume. Pod width was considered the most efficient character to use for indirect selection because it can be measured without regard to number of seeds per pod and is faster to measure than pod length.

Key Words: Glycine max (L.) Merr. • Breeding • Pod length • Pod width • Pod thickness • Indirect selection

1 Joint contribution from the Iowa Agric. Home Econ. Exp. Stn., Ames, Iowa, Project No. 2118, Journal Paper No. J-10018, and the Puerto Rico Agric. Exp. Stn., Mayaguez, PR 00708. The research was supported in part by a grant from the Iowa Soybean Promotion Board.

2 Graduate research assistant and professor, Dep. of Agronomy, Iowa State Univ., Ames, IA 50011.

Received for publication October 23, 1980.




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