Abstract
Key message
The exploration and dissection of a set of QTLs and candidate genes for gray leaf spot disease resistance using two fully assembled parental genomes may help expedite maize resistance breeding.
Abstract
The fungal disease of maize known as gray leaf spot (GLS), caused by Cercospora zeae-maydis and Cercospora zeina, is a significant concern in China, Southern Africa, and the USA. Resistance to GLS is governed by multiple genes with an additive effect and is influenced by both genotype and environment. The most effective way to reduce the cost of production is to develop resistant hybrids. In this study, we utilized the IBM Syn 10 Doubled Haploid (IBM Syn10 DH) population to identify quantitative trait loci (QTLs) associated with resistance to gray leaf spot (GLS) in multiple locations. Analysis of seven distinct environments revealed a total of 58 QTLs, 49 of which formed 12 discrete clusters distributed across chromosomes 1, 2, 3, 4, 8 and 10. By comparing these findings with published research, we identified colocalized QTLs or GWAS loci within eleven clustering intervals. By integrating transcriptome data with genomic structural variations between parental individuals, we identified a total of 110 genes that exhibit both robust disparities in gene expression and structural alterations. Further analysis revealed 19 potential candidate genes encoding conserved resistance gene domains, including putative leucine-rich repeat receptors, NLP transcription factors, fucosyltransferases, and putative xyloglucan galactosyltransferases. Our results provide a valuable resource and linked loci for GLS marker resistance selection breeding in maize.
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Funding
This work was supported by the National Key Research and Development Program of China to H. Liu (2022YFD1201700) and X. Li (2023YFD1401502), the Science and Technology Innovation 2030-Major Project to H. Liu (2023ZD04068), the National Natural Science Foundation of China to X. Yang (32101705), the Youth Innovation Team Project to X. Yang, the Earmarked Fund for CARS (CARS-02) to L. Cui and the Sichuan Science and Technology Program (2021YFYZ0021) to L. Cui.
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XL and XY designed and supervised the study. LC, MS, LZ, HZ, QK, LD, XL, XZ, YS, HZ, LD, WL, CZ, ZZ, WC, YM and HL performed the experiments. LC, MS, HZ, QK, XZ, HL, XY and XL analyzed the data. XL, HL, TL and XY prepared the manuscript and all the authors have read, and approved the final manuscript.
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Communicated by Mingliang Xu.
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Cui, L., Sun, M., Zhang, L. et al. Quantitative trait locus analysis of gray leaf spot resistance in the maize IBM Syn10 DH population. Theor Appl Genet 137, 183 (2024). https://doi.org/10.1007/s00122-024-04694-x
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DOI: https://doi.org/10.1007/s00122-024-04694-x