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Published in Crop Sci 15:793-797 (1975)
© 1975 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Plant Height, Protein Percentage, and Yield Relationships in Spring Wheat1

John F. Pepe and 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.

Key Words: Triticum aestivum L. em Thell. • Dwarf wheat • Semidwarf wheat • Correlation coefficients • Coefficients of determination

1 Paper no. 8861, scientific journal series, Minnesota Agric. Exp. Stn., and ARS, USDA. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the M.S. degree.

2 Formerly graduate research assistant, Univ. of Minnesota (now graduate research assistant, Colorado State Univ., Fort Collins) and research geneticist, ARS-USDA, Dep. of Agronomy and Plant Genetics, Univ. of Minnesota, St. Paul, MN 55108.

Received for publication February 14, 1975.




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