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New QTL for resistance to Puccinia polysora Underw in maize

Deng, Ce, Li, Huimin, Li, Zhimin, Tian, Zhiqiang, Chen, Jiafa, Chen, Gengshen, Zhang, Xuecai, Ding, Junqiang, Chang, Yuxiao
Journal of applied genetics 2019 v.60 no.2 pp. 147-150
Puccinia polysora, Southern corn rust, chromosomes, corn, cultivars, disease resistance, foliar diseases, genotyping, phenotypic variation, quantitative trait loci, single nucleotide polymorphism
Southern corn rust (SCR) is a prevalent foliar disease in maize. Deployment of resistant cultivars is an effective way to control SCR. In this study, resistance to SCR was evaluated in a BC₁RIL population comprising 118 lines grown under three different field conditions. Combined with a genetic map constructed from 1635 SNP markers obtained from the maize 9.4 K SNP Affymetrix® Axiom® Genotyping Array, single quantitative trait loci (QTL) were mapped on chromosomes 4, 9, and 10, respectively. The QTL on chromosome 4 (qSCR4.08) and chromosome 9 (qSCR9.04) were stable across multiple environments, and each explained more than 10% of the phenotypic variation. The stable QTL detected could be desirable sources of SCR resistance in maize-breeding programs.