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This article in CS

  1. Vol. 25 No. 4, p. 602-606
    Received: May 3, 1984

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Protein and Oil Percentage of Temperate Soybean Genotypes Evaluated in Tropical Environments1

  1. S. Rodriguez de Cianzio,
  2. J. F. Cavins and
  3. 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 ✕ 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.

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