Abstract
Key message
A comprehensive comparison of LMW-GS genes between Ae. tauschii and its progeny common wheat.
Abstract
Low molecular weight glutenin subunits (LMW-GSs) are determinant of wheat flour processing quality. However, the LMW-GS gene composition in Aegilops tauschii, the wheat D genome progenitor, has not been comprehensively elucidated and the impact of allohexaploidization on the Glu-D3 locus remains elusive. In this work, using the LMW-GS gene molecular marker system and the full-length gene-cloning method, LMW-GS genes at the Glu-D3 loci of 218 Ae. tauschii and 173 common wheat (Triticum aestivum L.) were characterized. Each Ae. tauschii contained 11 LMW-GS genes, and the whole collection was divided into 25 haplotypes (AeH01–AeH25). The Glu-D3 locus in common wheat lacked the LMW-GS genes D3-417, D3-507 and D3-552, but shared eight genes of identical open reading frame (ORF) sequences when compared to that of Ae. tauschii. Therefore, the allohexaploidization induces deletions, but exerts no influence on LMW-GS gene coding sequences at the Glu-D3 locus. 92.17% Ae. tauschii had 7-9 LMW-GSs, more than the six subunits in common wheat. The haplotypes AeH16, AeH20 and AeH23 of Ae. tauschii ssp. strangulate distributed in southeastern Caspian Iran were the main putative D genome donor of common wheat. These results facilitate the utilization of the Ae. tauschii glutenin gene resources and the understanding of wheat evolution.
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Acknowledgements
The authors declare no competing financial interests. We thank Dr. Xiaofei Zhang (North Carolina State University) for critical review. And we thank May, David B Iii and Schneider, Matthew G from University of Florida for their scientific English editing. This work was supported by the Ministry of Science and Technology of China (2014CB138101), the National Natural Science Foundation of China (31371610) and the National Transgenic Research Projects (2016ZX08009-003-004).
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Communicated by Andreas Graner.
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Shen, L., Luo, G., Song, Y. et al. Low molecular weight glutenin subunit gene composition at Glu-D3 loci of Aegilops tauschii and common wheat and a further view of wheat evolution. Theor Appl Genet 131, 2745–2763 (2018). https://doi.org/10.1007/s00122-018-3188-1
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DOI: https://doi.org/10.1007/s00122-018-3188-1