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<p>Wheat (<i>Triticum aestivum</i> L.) is a staple crop having critical importance for global food security. Heat stress during the reproductive phase severely reduces wheat yields and threatens global food security. This study aimed to assess genetic diversity and identify favorable alleles linked to heat tolerance in bread wheat using molecular markers. A total of 51 advanced breeding lines and 5 check varieties were evaluated under field conditions simulating terminal heat stress in a randomized block design with three replications. Fifteen simple sequence repeat (SSR) markers were used, revealing 41 polymorphic alleles with a mean polymorphism information content (PIC) of 0.56. Cluster analysis grouped the genotypes into 12 distinct clusters, indicating substantial genetic diversity. Marker-trait association analysis identified Xgwm11 and wmc527 as significantly linked to grain filling duration and kernel weight, respectively—two key traits contributing to heat stress tolerance. Genotypes G20, G21, and G35 exhibited superior alleles for both traits, suggesting their probable suitability as donor lines for heat-resilient wheat breeding. The identified markers and genotypes may offer valuable resources for marker-assisted selection (MAS), facilitating the development of climate-adapted wheat varieties and supporting efforts toward sustainable wheat production under rising global temperatures.</p>

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SSR marker-assisted diversity in advance breeding lines of bread wheat and superior allele identification for heat tolerance

  • 期刊论文

  • 发表日期：

    2026年7月29日

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  • Avishek Chatterjee,
  • Poulomi Sen,
  • Shouvik Gorai,
  • Sudip Bhattacharya,
  • Soham Hazra,
  • Ankur Mukhopadhyay,
  • Anirban Maji,
  • Md. Nasim Ali

摘要

Wheat (Triticum aestivum L.) is a staple crop having critical importance for global food security. Heat stress during the reproductive phase severely reduces wheat yields and threatens global food security. This study aimed to assess genetic diversity and identify favorable alleles linked to heat tolerance in bread wheat using molecular markers. A total of 51 advanced breeding lines and 5 check varieties were evaluated under field conditions simulating terminal heat stress in a randomized block design with three replications. Fifteen simple sequence repeat (SSR) markers were used, revealing 41 polymorphic alleles with a mean polymorphism information content (PIC) of 0.56. Cluster analysis grouped the genotypes into 12 distinct clusters, indicating substantial genetic diversity. Marker-trait association analysis identified Xgwm11 and wmc527 as significantly linked to grain filling duration and kernel weight, respectively—two key traits contributing to heat stress tolerance. Genotypes G20, G21, and G35 exhibited superior alleles for both traits, suggesting their probable suitability as donor lines for heat-resilient wheat breeding. The identified markers and genotypes may offer valuable resources for marker-assisted selection (MAS), facilitating the development of climate-adapted wheat varieties and supporting efforts toward sustainable wheat production under rising global temperatures.