title: Analysis of quantitative disease resistance to southern leaf blight and of multiple disease resistance in maize, using near-isogenic lines.
abstract: Maize inbred lines NC292 and NC330 were derived by repeated backcrossing of an elite source of southern leaf blight (SLB) resistance (NC250P) to the SLB-susceptible line B73, with selection for SLB resistance among and within backcross families at each generation. Consequently, while B73 is very SLB susceptible, its sister lines NC292 and NC330 are both SLB resistant. Previously, we identified the 12 introgressions from NC250P that differentiate NC292 and NC330 from B73. The goals of this study were to determine the effects of each introgression on resistance to SLB and to two other foliar fungal diseases of maize, northern leaf blight and gray leaf spot. This was achieved by generating and testing a set of near isogenic lines carry single or combinations of just two or three introgressions in a B73 background. Introgressions 3B, 6A, and 9B (bins 3.03-3.04, 6.01, and 9.02-9.03) all conferred significant levels of SLB resistance in the field. Introgression 6A was the only introgression that had a significant effect on juvenile plant resistance to SLB. Introgressions 6A and 9B conferred resistance to multiple diseases.
authors: Department of Plant Pathology, North Carolina State University, Raleigh, NC 27695-7616, USA.
authors: Araby R
authors: AR
authors: Belcher
authors: John C
authors: JC
authors: Zwonitzer
authors: Jose
authors: J
authors: Santa Cruz
authors: Mathew D
authors: MD
authors: Krakowsky
authors: Chia-Lin
authors: CL
authors: Chung
authors: Rebecca
authors: R
authors: Nelson
authors: Consuelo
authors: C
authors: Arellano
authors: Peter J
authors: PJ
authors: Balint-Kurti
mesh_terms: D001203:Ascomycota; D001947:Breeding / Q000379:methods; D003433:Crosses, Genetic; D060467:Disease Resistance / Q000235:genetics*; D051456:Gene Flow / Q000235:genetics; D005819:Genetic Markers / Q000235:genetics; D008957:Models, Genetic; D010935:Plant Diseases / Q000382:microbiology*; D016133:Polymerase Chain Reaction; D012641:Selection, Genetic; D013045:Species Specificity; D003313:Zea mays / Q000235:genetics* / Q000382:microbiology
chemical_list: D005819:Genetic Markers