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Originally published as Genetics Published Articles Ahead of Print on March 4, 2007.

Genetics, Vol. 176, 645-657, May 2007, Copyright © 2007
doi:10.1534/genetics.106.067892

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Precise Mapping of Quantitative Trait Loci for Resistance to Southern Leaf Blight, Caused by Cochliobolus heterostrophus Race O, and Flowering Time Using Advanced Intercross Maize Lines

P. J. Balint-Kurti*,{dagger},1, J. C. Zwonitzer{dagger}, R. J. Wisser{dagger}, M. L. Carson{ddagger}, M. A. Oropeza-Rosas§, J. B. Holland**,§ and S. J. Szalma§

* U.S. Department of Agriculture–Agricultural Research Service (USDA–ARS) Plant Science Research Unit and {dagger} Department of Plant Pathology, North Carolina State University, Raleigh, North Carolina 27695-7616, {ddagger} USDA–ARS, Cereal Disease Laboratory, St. Paul, Minnesota 55108 and ** USDA–ARS Plant Science Research Unit and § Department of Crop Science, North Carolina State University, Raleigh, North Carolina 27695-7620

1 Corresponding author: Department of Plant Pathology, 3418 Gardner Hall, Box 7616, North Carolina State University, Raleigh, NC 27695-7616.
E-mail: peter_balintkurti{at}ncsu.edu

The intermated B73 x Mo17 (IBM) population, an advanced intercross recombinant inbred line population derived from a cross between the maize lines B73 (susceptible) and Mo17 (resistant), was evaluated in four environments for resistance to southern leaf blight (SLB) disease caused by Cochliobolus heterostrophus race O. Two environments were artificially inoculated, while two were not inoculated and consequently had substantially lower disease pressure. Four common SLB resistance quantitative trait loci (QTL) were identified in all environments, two in bin 3.04 and one each in bins 1.10 and 8.02/3. There was no significant correlation between disease resistance and days to anthesis. A direct comparison was made between SLB QTL detected in two populations, independently derived from the same parental cross: the IBM advanced intercross population and a conventional recombinant inbred line population. Several QTL for SLB resistance were detected in both populations, with the IBM providing between 5 and, in one case, 50 times greater mapping resolution.






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Copyright © 2007 by the Genetics Society of America.