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<p><i>Aegilops tauschii</i> Coss. (DD genome) is a wild, annual species recognized as a progenitor of common wheat (<i>Triticum aestivum</i> L., AABBDD genome). As an important genetic resource for wheat breeding, many accessions of this species are now available from genebanks, providing opportunities for evolutionary and agronomic research. To date, three divergent lineages—TauL1, TauL2, and TauL3—have been identified in this species based on DNA-level genotypes. Among them, TauL3 may have played a critical role in shaping the D genome of common wheat, but its accessions are limited in both geographic origin (previously known only from Georgia) and availability. In this paper, we report TauL3 accessions sampled from previously undocumented habitats in Armenia, Azerbaijan, and Iran, discovered while assessing a collection of <i>Ae. tauschii</i> accessions. The newly identified TauL3 accessions suggest that this lineage has a broader distribution in the Transcaucasus and adjacent regions than previously thought. Together with Georgian TauL3 accessions, they provide valuable materials for research on the role of TauL3 in the evolution of common wheat, as well as for breeding practices utilizing <i>Ae. tauschii</i> germplasm. Nevertheless, TauL3 remains an exceptionally rare lineage. Conserving its natural habitats is an urgent priority.</p>

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Accessions of the genetically distinct TauL3 lineage of Aegilops tauschii Coss. from newly identified habitats in Armenia, Azerbaijan, and Iran

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  • 发表日期：

    2025年5月13日

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  • Yoshihiro Koyama,
  • Hiroyuki Tanaka,
  • Kazuhiro Sato,
  • Hisashi Tsujimoto,
  • Yoshihiro Matsuoka

摘要

Aegilops tauschii Coss. (DD genome) is a wild, annual species recognized as a progenitor of common wheat (Triticum aestivum L., AABBDD genome). As an important genetic resource for wheat breeding, many accessions of this species are now available from genebanks, providing opportunities for evolutionary and agronomic research. To date, three divergent lineages—TauL1, TauL2, and TauL3—have been identified in this species based on DNA-level genotypes. Among them, TauL3 may have played a critical role in shaping the D genome of common wheat, but its accessions are limited in both geographic origin (previously known only from Georgia) and availability. In this paper, we report TauL3 accessions sampled from previously undocumented habitats in Armenia, Azerbaijan, and Iran, discovered while assessing a collection of Ae. tauschii accessions. The newly identified TauL3 accessions suggest that this lineage has a broader distribution in the Transcaucasus and adjacent regions than previously thought. Together with Georgian TauL3 accessions, they provide valuable materials for research on the role of TauL3 in the evolution of common wheat, as well as for breeding practices utilizing Ae. tauschii germplasm. Nevertheless, TauL3 remains an exceptionally rare lineage. Conserving its natural habitats is an urgent priority.