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<p>Maize white spot (MWS) is a destructive foliar disease that severely threatens maize yield, quality, and global food security in tropical and subtropical regions. To elucidate the genetic basis of resistance to MWS, a genetic linkage map was constructed using 180 F<sub>2</sub> individuals derived from a cross between the resistant inbred line T32 and susceptible inbred line J51. The linkage map, consisting of 162 SSR markers, spanned 1081.21&#xa0;cM of the maize genome with an average marker interval of 6.67&#xa0;cM. Resistance of the F<sub>2:3</sub> population was evaluated under natural infection across three distinct environments in Yunnan province, China, revealing significant resistance differences between T32 and J51. Quantitative trait loci (QTL) analysis, performed using composite interval mapping, identified multiple resistance QTLs across three regions: one in Jiangdong, two in Mengga, and three in Santai. Importantly, a stable QTL consistently detected across all environments was located on chromosome 5, with LOD scores of 5.1178, 5.271, and 5.154 in Jiangdong, Mengga, and Santai, respectively. This QTL accounted for 13.48%, 10.12%, and 8.35% of the phenotypic variance for resistance in the respective environments. Notably, the additive effects of all detected QTLs were contributed by the resistant parent, T32. These QTLs provide valuable targets for further fine mapping and marker-assisted selection in maize breeding programs aimed at enhancing resistance to white spot disease.</p>

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Identification of quantitative trait loci for resistance to maize white spot

  • 期刊论文

  • 发表日期：

    2025年7月25日

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  • Yuanzong Tang,
  • Jie Xie,
  • Hanlei Wang,
  • Xiaomei Zhang,
  • Hongbo Qiu

摘要

Maize white spot (MWS) is a destructive foliar disease that severely threatens maize yield, quality, and global food security in tropical and subtropical regions. To elucidate the genetic basis of resistance to MWS, a genetic linkage map was constructed using 180 F2 individuals derived from a cross between the resistant inbred line T32 and susceptible inbred line J51. The linkage map, consisting of 162 SSR markers, spanned 1081.21 cM of the maize genome with an average marker interval of 6.67 cM. Resistance of the F2:3 population was evaluated under natural infection across three distinct environments in Yunnan province, China, revealing significant resistance differences between T32 and J51. Quantitative trait loci (QTL) analysis, performed using composite interval mapping, identified multiple resistance QTLs across three regions: one in Jiangdong, two in Mengga, and three in Santai. Importantly, a stable QTL consistently detected across all environments was located on chromosome 5, with LOD scores of 5.1178, 5.271, and 5.154 in Jiangdong, Mengga, and Santai, respectively. This QTL accounted for 13.48%, 10.12%, and 8.35% of the phenotypic variance for resistance in the respective environments. Notably, the additive effects of all detected QTLs were contributed by the resistant parent, T32. These QTLs provide valuable targets for further fine mapping and marker-assisted selection in maize breeding programs aimed at enhancing resistance to white spot disease.