High molecular weight glutenin gene diversity in Aegilops tauschii demonstrates unique origin of superior wheat quality

Open Wild Wheat Consortium

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Central to the diversity of wheat products was the origin of hexaploid bread wheat, which added the D-genome of Aegilops tauschii to tetraploid wheat giving rise to superior dough properties in leavened breads. The polyploidization, however, imposed a genetic bottleneck, with only limited diversity introduced in the wheat D-subgenome. To understand genetic variants for quality, we sequenced 273 accessions spanning the known diversity of Ae. tauschii. We discovered 45 haplotypes in Glu-D1, a major determinant of quality, relative to the two predominant haplotypes in wheat. The wheat allele 2 + 12 was found in Ae. tauschii Lineage 2, the donor of the wheat D-subgenome. Conversely, the superior quality wheat allele 5 + 10 allele originated in Lineage 3, a recently characterized lineage of Ae. tauschii, showing a unique origin of this important allele. These two wheat alleles were also quite similar relative to the total observed molecular diversity in Ae. tauschii at Glu-D1. Ae. tauschii is thus a reservoir for unique Glu-D1 alleles and provides the genomic resource to begin utilizing new alleles for end-use quality improvement in wheat breeding programs.

Original languageEnglish (US)
Article number1242
JournalCommunications biology
Issue number1
StatePublished - Dec 2021
Externally publishedYes

Bibliographical note

Funding Information:
E.D. was supported through Monsanto’s Beachell-Borlaug International Scholars Program. This material is based upon work supported by the National Science Foundation under Award No. 1822162 “Phase II IUCRC at Kansas State University Center for Wheat Genetic Resources WGRC” and Award No. 1339389 “GPF-PG: Genome Structure and Diversity of Wheat and Its Wild Relatives”. B.B.H.W. was supported by the UK Biotechnology and Biological Sciences Research Council Designing Future Wheat Institute Strategic Programme BB/P016855/1. Any opinions, findings, and conclusions, or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.

Publisher Copyright:
© 2021, The Author(s).


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