New QTL for resistance to Puccinia polysora Underw in maize
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.
KeywordsMaize Southern corn rust QTL SNP marker
YC and JD conducted the experiment. YC, JD, and CD analyzed data and prepared the manuscript.
CD, HL, ZL, ZT, JC, GC, and XZ provided help for the phenotypic collection and discussed the manuscript. All authors have read and approved the final manuscript.
This work was funded by a grant from the National Basic Research Program of China (2016YFD0101803), Henan Basic Research Program of China (161100110500), and the Shenzhen science and technology research funding (JSGG20160429104101251).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
This article does not contain any studies with human participants or animals performed by any of the authors.
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