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Crop Science Abstract -

Plant Height, Protein Percentage, and Yield Relationships in Spring Wheat1


This article in CS

  1. Vol. 15 No. 6, p. 793-797
    Received: Feb 14, 1975

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  1. John F. Pepe and
  2. Robert E. Heiner2



Two hard red spring wheat (Triticum aestivum L. em Thell.) semidwarfs, 'Era' and 'Chris Mutant,' with different dwarfing genes, were hybridized and 126 F5 progeny lines were studied to determine the relationship among the variables plant height, yield, and protein percentage. Of these 126 lines, 26 were tall (> 90 cm), 89 were semidwarf (60 to 90 cm), and 11 were dwarf (< 60 cm). The lines were divided among five yield nurseries grown in 1972. Tall vs. semidwarf comparisons were available in three of the nurseries, and the fifth nursery contained nine families of sister lines that differed in plant height (F3-derived F5 families).

Phenotypic correlation coefficients and coefficients of determination for the three characters showed that plant height did not influence grain yield or protein percentage of the lines derived from this cross. The only apparent association was the highly inverse relationship between yield and protein percentage. The inverse yield protein percentage relationship found in high-yielding lines appeared to result from a complex interaction between source and sink and not from an association with plant height.

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