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Development, identification, and utilization of wheat–tetraploid Thinopyrum elongatum 4EL translocation lines resistant to stripe rust

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Abstract

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The new stripe rust resistance gene Yr4EL in tetraploid Th. elongatum was identified and transferred into common wheat via 4EL translocation lines.

Abstract

Tetraploid Thinopyrum elongatum is a valuable genetic resource for improving the resistance of wheat to diseases such as stripe rust, powdery mildew, and Fusarium head blight. We previously reported that chromosome 4E of the 4E (4D) substitution line carries all-stage stripe rust resistance genes. To optimize the utility of these genes in wheat breeding programs, we developed translocation lines by inducing chromosomal structural changes through 60Co-γ irradiation and developing monosomic substitution lines. In total, 53 plants with different 4E chromosomal structural changes were identified. Three homozygous translocation lines (T4DS·4EL, T5AL·4EL, and T3BL·4EL) and an addition translocation line (T5DS·4EL) were confirmed by the genomic in situ hybridization (GISH), fluorescence in situ hybridization (FISH), FISH-painting, and wheat 55 K SNP array analyses. These four translocation lines, which contained chromosome arm 4EL, exhibited high stripe rust resistance. Thus, a resistance gene (tentatively named Yr4EL) was localized to the chromosome arm 4EL of tetraploid Th. elongatum. For the application of marker-assisted selection (MAS), 32 simple sequence repeat (SSR) markers were developed, showing specific amplification on the chromosome arm 4EL and co-segregation with Yr4EL. Furthermore, the 4DS·4EL line could be selected as a good pre-breeding line that better agronomic traits than other translocation lines. We transferred Yr4EL into three wheat cultivars SM482, CM42, and SM51, and their progenies were all resistant to stripe rust, which can be used in future wheat resistance breeding programs.

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Acknowledgements

This work was supported by the Major Program of National Agricultural Science and Technology of China (NK20220607), the National Natural Science Foundation of China (No. 31971883, No. 32200180), and the Science and Technology Bureau of Sichuan Province (2023NSFSC1995, 2022YFH0069, 2022NSFSC1671), and the Science and Technology Bureau of Chengdu City (2022-YF05-00449-SN). We thank Dr. George Fedak, Eastern Cereal and Oilseed Research Center, Ottawa, Canada, for kindly supplying the Trititrigia 8801 material used in this study. Thanks to Dr. Yinghui Li for editing and suggestion of the manuscript. We also thank Prof. Qiuzhen Jia, Plant Protection Institute of Gansu Academy of Agricultural Sciences, Gansu, China, for kindly supplying the urediniospores of the P. striiformis f. sp. tritici races.

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Authors

Contributions

BRG, LFC, HZ, DDW, and HYK conducted the experiment, analyzed the data, and drafted the manuscript. WZ, LX, YRC, and YW developed substitution lines and evaluated disease resistance. JZ, XF, LNS, HQZ, GC, and YHZ provided technique guidance. DDW and HYK designed the experiment and formulated the questions. All the authors read and approved the manuscript.

Corresponding authors

Correspondence to Houyang Kang or Dandan Wu.

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The authors have not disclosed any funding.

Conflict of interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Data availability

The whole genome sequence of diploid Th. elongatum reported in this study can be found in the National Center for Biotechnology Information, NCBI BioProject ID PRJNA540081. Data supporting the results of this study are in the manuscript or supplemental file.

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Communicated by Lingrang Kong.

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Gong, B., Chen, L., Zhang, H. et al. Development, identification, and utilization of wheat–tetraploid Thinopyrum elongatum 4EL translocation lines resistant to stripe rust. Theor Appl Genet 137, 17 (2024). https://doi.org/10.1007/s00122-023-04525-5

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  • DOI: https://doi.org/10.1007/s00122-023-04525-5

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