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

Emily Delorean, Liangliang Gao, Jose Fausto Cervantes Lopez, Ali Mehrabi, Alison Bentley, Amir Sharon, Beat Keller, Brande B. H. Wulff, Brian Steffenson, Burkhard Steuernagel, Carolina Paola Sansaloni, Deng-Cai Liu, Evans Lagudah, Firuza Nasyrova, Gina Brown-Guedira, Hanan Sela, Jan Dvorak, Jesse Poland, Klaus Mayer, Ksenia KrasilevaKumar Gaurav, Long Mao, Mario Caccamo, Martin Mascher, Mingcheng Luo, Parveen Chhuneja, Rob Davey, Justin Faris, Steven Xu, Paul Nicholson, Noam Chayut, Mike Ambrose, Nidhi Rawat, Vijay K. Tiwari, Brande B. H. Wulff, Maria Itria Ibba, Open Wild Wheat Consortium

Research output: Contribution to journalArticlepeer-review

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Abstract

AbstractCentral to the diversity of wheat products was the origin of hexaploid bread wheat, which added the D-genome of $\textit{Aegilops tauschii}$ 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 $\textit{Ae. tauschii}$. We discovered 45 haplotypes in $\textit{Glu-D1}$, a major determinant of quality, relative to the two predominant haplotypes in wheat. The wheat allele $\textit{2}$ + $\textit{12}$ was found in $\textit{Ae. tauschii}$ Lineage 2, the donor of the wheat D-subgenome. Conversely, the superior quality wheat allele $\textit{5}$ + $\textit{10}$ allele originated in Lineage 3, a recently characterized lineage of $\textit{Ae. tauschii}$, showing a unique origin of this important allele. These two wheat alleles were also quite similar relative to the total observed molecular diversity in $\textit{Ae. tauschii}$ at $\textit{Glu-D1}$. $\textit{Ae. tauschii}$ is thus a reservoir for unique $\textit{Glu-D1}$ alleles and provides the genomic resource to begin utilizing new alleles for end-use quality improvement in wheat breeding programs.
Original languageEnglish (US)
JournalCommunications Biology
Volume4
Issue number1
DOIs
StatePublished - Nov 1 2021

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