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<p>Drought is one of the major constraints to wheat productivity in semi-arid regions. This study evaluated drought tolerance in a doubled haploid (DH) wheat population derived from a cross between two parents with contrasting responses to water stress. The population was assessed under four environments differing in water availability and climatic conditions. Significant genotype × environment (G×E) interactions were observed for grain yield and its components. Number of grains per square meter (NG/m²) was the most consistent and significant trait associated with yield across all environments (H² = 0.63), showing strong correlations and direct effects on yield. The transgressive segregation observed in the DH lines, with some lines outperforming the drought-tolerant parent, suggests effective recombination of favorable alleles. These results identify NG/m² as a key selection target and highlight promising genotypes for use in pre-breeding and QTL mapping for drought resilience in wheat.</p>

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Phenotypic variation in drought response for a double-haploid population of bread wheat (Triticum aestivum)

  • 期刊论文

  • 发表日期：

    2026年7月20日

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  • Mariana A. Balmaceda,
  • Marcelo Helguera,
  • Fernanda G. González,
  • Mónica B. Ruiz

摘要

Drought is one of the major constraints to wheat productivity in semi-arid regions. This study evaluated drought tolerance in a doubled haploid (DH) wheat population derived from a cross between two parents with contrasting responses to water stress. The population was assessed under four environments differing in water availability and climatic conditions. Significant genotype × environment (G×E) interactions were observed for grain yield and its components. Number of grains per square meter (NG/m²) was the most consistent and significant trait associated with yield across all environments (H² = 0.63), showing strong correlations and direct effects on yield. The transgressive segregation observed in the DH lines, with some lines outperforming the drought-tolerant parent, suggests effective recombination of favorable alleles. These results identify NG/m² as a key selection target and highlight promising genotypes for use in pre-breeding and QTL mapping for drought resilience in wheat.