Scholarlink

<p>To diversify the traditional rice–wheat cropping system, maize is promoted as a potential alternative to rice. However, waterlogging (WL) during the <i>kharif</i> season, especially in soils compacted due to rice puddling, poses a significant challenge to maize cultivation. This study aimed to identify genomic regions associated with WL tolerance in maize using an F₂:₃ population derived from a cross between a WL-tolerant line (I 185) and a WL-susceptible line (SE 565A). A total of 154 <i>F</i><sub>2:3</sub> lines were evaluated under controlled WL conditions at the <i>V</i><sub>3</sub>–<i>V</i><sub>5</sub> growth stage, with physiological and root traits recorded after WL stress. A total of 21 QTLs associated with key traits under WL stress were identified at a LOD threshold of ≥ 3 and a phenotypic variance explained (PVE) of ≥ 10%. Major QTLs for root dry weight, shoot dry weight, total dry weight, root diameter, surface area, volume, and length were located on chromosome 8. Additional loci were identified on chromosomes 3, 5, 9, and 10. These findings highlight important genomic regions associated with WL tolerance in maize. Although further fine mapping is needed, the identified QTLs provide valuable insights for marker-assisted selection (MAS) and could support the development of WL-resilient maize hybrids, aiding sustainable diversification of rice-based cropping systems.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Breeding resilience: decoding waterlogging tolerance traits in maize

  • 期刊论文

  • 发表日期：

    2025年9月13日

查看全文
  • Sanjay Kumar,
  • Rumesh Ranjan,
  • Tosh Garg,
  • Yogesh Vikal,
  • Abhijit Das

摘要

To diversify the traditional rice–wheat cropping system, maize is promoted as a potential alternative to rice. However, waterlogging (WL) during the kharif season, especially in soils compacted due to rice puddling, poses a significant challenge to maize cultivation. This study aimed to identify genomic regions associated with WL tolerance in maize using an F₂:₃ population derived from a cross between a WL-tolerant line (I 185) and a WL-susceptible line (SE 565A). A total of 154 F2:3 lines were evaluated under controlled WL conditions at the V3–V5 growth stage, with physiological and root traits recorded after WL stress. A total of 21 QTLs associated with key traits under WL stress were identified at a LOD threshold of ≥ 3 and a phenotypic variance explained (PVE) of ≥ 10%. Major QTLs for root dry weight, shoot dry weight, total dry weight, root diameter, surface area, volume, and length were located on chromosome 8. Additional loci were identified on chromosomes 3, 5, 9, and 10. These findings highlight important genomic regions associated with WL tolerance in maize. Although further fine mapping is needed, the identified QTLs provide valuable insights for marker-assisted selection (MAS) and could support the development of WL-resilient maize hybrids, aiding sustainable diversification of rice-based cropping systems.