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Title: Use of an Advanced Intercross Line Population for Precise Mapping of Quantitative Trait Loci for Gray Leaf Spot Resistance in Maize

Author
item Balint-Kurti, Peter
item ZWONITZER, JOHN - NORTH CAROLINA STATE UNIV
item WISSER, RANDALL - NORTH CAROLINA STATE UNIV

Submitted to: Crop Science
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 4/1/2008
Publication Date: 9/1/2008
Citation: Balint Kurti, P.J., Zwonitzer, J., Wisser, R. 2008. Use of an Advanced Intercross Line Population for Precise Mapping of Quantitative Trait Loci for Gray Leaf Spot Resistance in Maize. Crop Science. 48:1696-1703.

Interpretive Summary: Using a population designed for the precise mapping of quatitative traits, five regions conferring resistance to gray leaf spot disease of miaze (corn)have been identified. These regions were identified with much more precision than had been possible in previous studies.

Technical Abstract: Grey leaf spot (GLS) (caused by Cercospora zeae-maydis) of maize (Zea mays L.)is an important fungal disease of maize in the U.S. and worldwide. The IBM population, an advanced intercross recombinant inbred line population derived from a cross between the maize lines Mo17 (resistant) and B73 (susceptible), was evaluated in three environments (Andrews, NC in 2005, 2006 and 2007) for resistance to GLS and for days from planting to anthesis. A conventional recombinant inbred line (RIL) population derived from the same two parents (the “Stuber “ population) was also assessed fof GLS resistance in two environments (Andrews NC, 2004 and 2005). Quantitative trait loci (QTL) for GLS resistance were detected in each population. Five significant QTL were detected in the IBM population in maize bins 1.05, 2.04, 9.03 and 9.05. In each case the QLT were localized to regions less than 3 centiMorgans (cM). These results are compared with results derived from the analysis of the Stuber population and five other GLS QTL studies in the literature. Three DTA QTL were also detected in bins 4.09, 8.05 and 9.02. There was no significant correlation between disease resistance and days to anthesis.