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Title: IDENTIFICATION OF QUANTITATIVE TRAIT LOCI FOR RESISTANCE TO SOUTHERN LEAF BLIGHT AND DAYS TO ANTHESIS IN A MAIZE RECOMBINANT INBRED LINE POPULATION

Author
item Balint-Kurti, Peter
item Krakowsky, Matthew
item ROBERTSON, LEILANNI - NORTH CAROLINA STATE UNIV
item JINES, MICHAEL - NORTH CAROLINA STATE UNIV
item MOLNAR, TERRANCE - PIONEER GENETIQUE PACE
item GOODMAN, MAJOR - NORTH CAROLINA STATE UNIV
item Holland, Jim - Jim

Submitted to: Phytopathology
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 4/24/2006
Publication Date: 9/1/2006
Citation: Balint Kurti, P.J., Krakowsky, M.D., Robertson, L., Jines, M., Molnar, T., Goodman, M., Holland, J.B. 2006. Identification of quantitative trait loci for resistance to southern leaf blight and days to anthesis in a maize recombinant inbred line population. Phytopathology. 96:1067-1071.

Interpretive Summary: Disease resistance in plants is often governed by the actions of many genes, each with relatively small ‘quantitative’ effects. Here we identified and crudely characterized several regions of the genome responsible for resistance in maize(corn) to southern corn leaf blight, an important disease in the south eastern US. This information is useful for breeders in designing schemes to incorporate disease resistance qualities into their lines.

Technical Abstract: A recombinant inbred line population derived from a cross between the maize lines NC300 (resistant) and B104 (susceptible) was evaluated for resistance to southern leaf blight (SLB) caused by Cochliobolus heterostrophus race O and for time to anthesis in four environments. Correlations between disease ratings in different environments were high (0.78-0.89) and the overall broad-sense heritability for SLB resistance was 0.89. When average area under disease progress curve (AUDPC) ratings were fitted to a model, 8 potential QTL were identified, the two strongest being on chromosomes 3 (bin 3.04) and 9 (bin 9.03-9.04). Some time-point specific SLB resistance QTL were also identified. There was no significant correlation between disease resistance and time to anthesis. Eight potential QTL for time to anthesis were identified, none of which coincided with any SLB resistance QTL.