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Genetic Variability After 65 Generations of Selection in Illinois High Oil, Low Oil, High Protein, and Low Protein Strains of Zea mays L.¹

Significant genetic variability, as measured by variation among half-sib family means, was found for both oil and protein content after 65 generations of selection in Illinois high oil (IHO), low oil (ILO) high protein (IHP) and low protein (ILP) strains of maize (Zea mays L.). Correlated responses between oil and protein over the 65 generations of selection have been small. Predicted gains per generation based on selection of the upper 20% of half-sib families from a test of one replicate grown at one location in one year were slightly higher than those observed as an average of 65 generations for IHP and ILP and lower for IHO and ILO.

Key Words: Correlated response • Heritability

² Associate and assistant professor of Plant Genetics, respectively, University of Illinois, Urbana 61801.

Received for publication August 9, 1968.

This article has been cited by other articles:

				J.W. Dudley From Means to QTL: The Illinois Long-Term Selection Experiment as a Case Study in Quantitative Genetics Crop Sci., December 18, 2007; 47(Supplement_3): S-20 - S-31. [Abstract] [Full Text] [PDF]