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Analysis of population structure and origin in Aegilops tauschii Coss. from China through SNP markers

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Abstract

As the D genome progenitor of common wheat, Aegilops tauschii Cosson is geographically widespread in central Eurasia. In spite of intensive global studies, the origin and population structure of Ae. tauschii from China is still ambiguous. In this work, we detected 4245 single nucleotide polymorphism across 67 Ae. tauschii accessions from whole natural habitat to re-evaluate the population structure and phylogenetic relationship. As a result, Ae. tauschii accessions from Xinjiang were consistently allocated into sublineage 1E, revealing the easternmost of the natural distribution for Ae. tauschii wild population. Unexpectedly, the accessions from Yellow River region were firstly separated from L1 to be an independent cluster, the rest of which then subdivided into sublineages 1W and 1E. In addition, Ae. tauschii in this region exhibited high FST values with those in Central Asia, South Asia, and Xinjiang, respectively, ranging from 0.5863 to 0.8369. These results indicate that Ae. tauschii in Yellow River region might contain individual genetic variations absent in other sublineages, which could provide excellent gene resources for improvement in common wheat. The neighbor-joining tree based on the genetic distances indicated Ae. tauschii in Yellow River region to be closely related with AY57 accession from Turkmenistan, with bootstrap value of 96%. Moreover, a synchronous flowering time was observed in AY57 accession and those in Yellow River region. These results demonstrate that the accessions in Yellow River region, as an adventive population, may be directly radiated from the southern area of Turkmenistan.

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Acknowledgements

This work was supported by National Natural Science Foundation of China (Grant Nos. 31601297 and 31871615) and Key Scientific Research Projects of Higher Education Institutions in Henan Province (Grant No. 20A210007).

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  1. School of Life Sciences, State Key Laboratory of Cotton Biology, Key Laboratory of Plant Stress Biology, Henan University, Kaifeng, 475004, Henan, People’s Republic of China

    Yazhong Su, Mengwen Zou, Yumeng Zhu, Xue Han, Yuge Li, Dale Zhang & Suoping Li

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  1. Yazhong Su
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Correspondence to Dale Zhang or Suoping Li.

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Su, Y., Zou, M., Zhu, Y. et al. Analysis of population structure and origin in Aegilops tauschii Coss. from China through SNP markers. Genet Resour Crop Evol 67, 923–934 (2020). https://doi.org/10.1007/s10722-020-00890-y

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