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CROP BREEDING & GENETICS

Genetic Analysis of Corn Kernel Chemical Composition in the Random Mated 7 Generation of the Cross of Generations 70 of IHP x ILP

^a Dep. of Crop Sci., Univ. of Illinois, Urbana, IL 61801
^b Emprevita Corp., Lawrence, KS 66046
^c Monsanto Co., St. Louis, MO 63167

^* Corresponding author (jdudley{at}uiuc.edu)

To identify and characterize quantitative trait loci (QTL) affecting kernel weight and concentrations of protein, oil, and starch in the corn (Zea mays L.) kernel, plants from generations 70 of the Illinois High Protein (IHP) and Illinois Low Protein (ILP) strains, previously developed by divergent selection for kernel protein concentration, were crossed. The cross was random mated (RM) seven generations and selfed twice to develop 500 F₁RM₇S₂ lines. The lines per se were evaluated at three locations with two replications for 2 yr and testcrosses were evaluated at three locations in 1 yr. Genotypes were evaluated using 499 SNP markers on DNA from a bulk of leaf tissue from each line. As the parent plants used to make the original cross were not available for genotyping, previously reported multivariable and modified simple interval mapping (SIM) procedures were used. SIM identified more significant regions for all traits than did single marker analysis. Correlations and signs of QTL effects suggest development of high protein–high starch lines would be difficult but that it should be possible to develop high protein–high oil lines with minimal effects on kernel weight. The identification of a large number of QTL (at least 40 each for oil, protein, starch, and kernel weight) with small effects agrees in general with earlier estimates based on quantitative genetic theory and has implications for breeding strategies for improved corn kernel quality traits.

Abbreviations: IHO, Illinois High Oil • IHP, Illinois High Protein • ILO, Illinois Low Oil • ILP, Illinois Low Protein • QTL, quantitative trait loci • RM, random mated • SIM, simple interval mapping • SMA, single marker analysis

This article has been cited by other articles:

				J. W. Dudley Epistatic Interactions in Crosses of Illinois High Oil x Illinois Low Oil and of Illinois High Protein x Illinois Low Protein Corn Strains Crop Sci., January 16, 2008; 48(1): 59 - 68. [Abstract] [Full Text] [PDF]

				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]