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<p>India’s North Western Zone is striving to diversify its traditional rice-wheat cropping system by promoting maize as a viable alternative to rice. However, maize cultivation in this region faces a significant challenge due to monsoon-induced waterlogging (WL), particularly in compacted soils formed by puddling during rice cultivation. To address this issue, the present study aimed to identify genomic regions associated with WL tolerance using a mapping population of 154 F<sub>2:3</sub> lines derived from a cross between a WL-tolerant maize inbred line (I 185) and a WL-susceptible line (SE 565&#xa0;A). The population was genotyped using SSR markers, which resulted in a genetic linkage map spanning 1950.44&#xa0;cM with an average marker interval of 21.67&#xa0;cM. The F<sub>2:3</sub> families, along with control checks, were evaluated under artificially imposed WL conditions at the knee-high stage for six days during the <i>kharif</i> season. Phenotypic data were collected for cob yield and key physiological and morphological traits. A total of 15 quantitative trait loci (QTLs) were identified with a LOD threshold ≥ 3.5 and phenotypic variance explained (PVE) ≥ 4%. These findings reveal key genomic regions contributing to WL tolerance, offering critical insights for marker-assisted selection and the development of waterlogging-resilient maize varieties suited for South Asian agro-climatic conditions.</p>

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QTLs Governing Morphophysiotraits Linked to Waterlogging Tolerance in Tropical Maize

  • 期刊论文

  • 发表日期：

    2026年3月13日

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  • Sanjay Kumar,
  • Rumesh Ranjan,
  • Tosh Garg,
  • Surinder K. Sandhu,
  • Yogesh Vikal,
  • Abhijit Das

摘要

India’s North Western Zone is striving to diversify its traditional rice-wheat cropping system by promoting maize as a viable alternative to rice. However, maize cultivation in this region faces a significant challenge due to monsoon-induced waterlogging (WL), particularly in compacted soils formed by puddling during rice cultivation. To address this issue, the present study aimed to identify genomic regions associated with WL tolerance using a mapping population of 154 F2:3 lines derived from a cross between a WL-tolerant maize inbred line (I 185) and a WL-susceptible line (SE 565 A). The population was genotyped using SSR markers, which resulted in a genetic linkage map spanning 1950.44 cM with an average marker interval of 21.67 cM. The F2:3 families, along with control checks, were evaluated under artificially imposed WL conditions at the knee-high stage for six days during the kharif season. Phenotypic data were collected for cob yield and key physiological and morphological traits. A total of 15 quantitative trait loci (QTLs) were identified with a LOD threshold ≥ 3.5 and phenotypic variance explained (PVE) ≥ 4%. These findings reveal key genomic regions contributing to WL tolerance, offering critical insights for marker-assisted selection and the development of waterlogging-resilient maize varieties suited for South Asian agro-climatic conditions.