Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 25:602-606 (1985)
© 1985 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Protein and Oil Percentage of Temperate Soybean Genotypes Evaluated in Tropical Environments1

S. Rodriguez de Cianzio, J. F. Cavins and W. R. Fehr2

Breeding for seed protein and oil content of soybean [Glycine max (L.) Merr.) genotypes adapted to temperate climates would require less time if selection could be practiced in tropical locations during the winter. The primary objective of the study was to determine the effectiveness of selection in tropical environments for seed composition of genotypes adapted to the northern United States. Twenty random F4-derived lines from each of two crosses were evaluated in six plantings at Isabela, PR, and in one planting at Ames, IA, during each of 2 years. Protein, oil, and protein + oil percentage were determined for individual plants and for plots harvested in bulk. The genotype x planting interactions were not significant for any of the traits, except for oil percentage in one cross. Phenotypic and rank correlations for performance of the genotypes in Iowa and Puerto Rico ranged from 0.75 to 0.92 and were highly significant. for each of the three traits, ranking of entries among the Puerto Rico environments was similar to the ranking between the Iowa environments. The results indicated that plantings in tropical locations can be used effectively to select for protein, oil, and protein + oil percentage among soybean lines adapted to temperate environments.

Key Words: Glycine max (L.) Merr. • Seed composition • Heritability

1 Joint contribution from the Iowa Agric. and Home Econ. Exp. Stn., Ames, IA, Project No. 2475, Journal Paper no. J-11446; the Puerto Rico Agric. Exp. Stn., Mayaguez, PR; and the USDA, Northern Regional Research Center, Peoria, IL. The research was supported by a grant from the Iowa Soybean Promotion Board.

2 Associate professor, Dep. of Agronomy, Iowa State Univ. and Dep. of Agronomy, Univ. of Puerto Rico, Mayaguez, PR 00708, Chemist, USDA, Northern Regional Research Center, Peoria, IL 61604, professor, Dep. of Agronomy, Iowa State Univ., Ames, IA 50011.

Received for publication May 3, 1984.




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Copyright © 1985 by the Crop Science Society of America.