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Background <p>The wild tetraploid wheat <i>Triticum turgidum</i> var. <i>dicoccoides</i> is a valuable source of genetic variation for improving disease resistance, drought tolerance, and grain protein quantity and quality in cultivated wheat. However, little is known about the genetic basis of DNA introgression from wild relatives into cultivated backgrounds. Because wild germplasm contains both favorable alleles and undesirable agronomic traits, understanding segregation and recombination patterns is essential for its effective use in breeding. This study aimed to evaluate a population of backcross inbred lines (BILs) derived from <i>T. turgidum</i> var. <i>dicoccoides</i> to identify quantitative trait loci (QTL) associated with grain quality and yield-related traits.<!--Query ID="Q1" Text="Please check if the article title is presented correctly." Resolved="yes"--></p> Results <p>The BIL population was evaluated in replicated field trials for grain protein content, fiber content, and yield components. Genomic analysis characterized the distribution of introgressed segments from <i>T. turgidum</i> var. <i>dicoccoides</i> within the durum wheat genome. QTL mapping identified 24 QTLs associated with variation in grain protein (12 QTL), fiber content (5 QTL), and yield traits (7 QTL). <!--Query ID="Q2" Text="Please confirm if the author names are presented accurately." Resolved="yes"-->QTLs were detected on nine chromosomes (1B, 2B, 3&#xa0;A, 4&#xa0;A, 4B, 5&#xa0;A, 5B, 6B, and 7B), with several loci consistently expressed across environments and years, highlighting stable genomic regions controlling key traits.<!--Query ID="Q3" Text="Please check if affiliations are captured correctly." Resolved="yes"--></p> Conclusions <p>The study demonstrates that BIL populations are effective tools for a rapid introgression of beneficial alleles from wild wheat relatives, as it is the case for the fiber content and its implication for nutritional quality. The detected QTL provide a foundation for developing near-isogenic lines (NILs) to investigate individual locus effects and facilitate the incorporation of valuable wild alleles into future wheat breeding programs.<!--Query ID="Q4" Text="Please check abbreviation section if the provided description of the corresponding terms are captured correctly." Resolved="yes"--></p>

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Identification of new QTLs for quality traits and yield using tetraploid wheat interspecific backcross inbred lines

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月14日

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  • Ilaria Marcotuli,
  • Josè Miguel Soriano,
  • Pasqualina Colasuonno,
  • Sara Muciaccia,
  • Agata Gadaleta

摘要

Background

The wild tetraploid wheat Triticum turgidum var. dicoccoides is a valuable source of genetic variation for improving disease resistance, drought tolerance, and grain protein quantity and quality in cultivated wheat. However, little is known about the genetic basis of DNA introgression from wild relatives into cultivated backgrounds. Because wild germplasm contains both favorable alleles and undesirable agronomic traits, understanding segregation and recombination patterns is essential for its effective use in breeding. This study aimed to evaluate a population of backcross inbred lines (BILs) derived from T. turgidum var. dicoccoides to identify quantitative trait loci (QTL) associated with grain quality and yield-related traits.

Results

The BIL population was evaluated in replicated field trials for grain protein content, fiber content, and yield components. Genomic analysis characterized the distribution of introgressed segments from T. turgidum var. dicoccoides within the durum wheat genome. QTL mapping identified 24 QTLs associated with variation in grain protein (12 QTL), fiber content (5 QTL), and yield traits (7 QTL). QTLs were detected on nine chromosomes (1B, 2B, 3 A, 4 A, 4B, 5 A, 5B, 6B, and 7B), with several loci consistently expressed across environments and years, highlighting stable genomic regions controlling key traits.

Conclusions

The study demonstrates that BIL populations are effective tools for a rapid introgression of beneficial alleles from wild wheat relatives, as it is the case for the fiber content and its implication for nutritional quality. The detected QTL provide a foundation for developing near-isogenic lines (NILs) to investigate individual locus effects and facilitate the incorporation of valuable wild alleles into future wheat breeding programs.