Abstract
Key message
A new wheat–Thinopyrum ponticum translocation line with excellent powdery mildew resistance was produced, and alien-specific PCR markers and FISH probes were developed by SLAF-seq.
Abstract
Powdery mildew is one of the most threatening diseases in wheat production. Thinopyrum ponticum (Podp.) Barkworth and D. R. Dewey, as a wild relative, has been used for wheat genetic improvement for the better part of a century. In view of the good powdery mildew resistance of Th. ponticum, we have been working to transfer the resistance genes from Th. ponticum to wheat by creating translocation lines. In this study, a new wheat–Th. ponticum translocation line with excellent resistance and agronomic performance was developed and through seedling disease evaluation, gene postulation and diagnostic marker analysis proved to carry a novel Pm gene derived from Th. ponticum. Cytogenetic analysis revealed that a small alien segment was translocated to the terminal of chromosome 1D to form new translocation TTh-1DS·1DL chromosome. The translocation breakpoint was determined to lie in 21.5 Mb region of chromosome 1D by using Wheat660K SNP array analysis. Based on specific-locus amplified fragment sequencing (SLAF-seq) technology, eight molecular markers and one repetitive sequence probe were developed, which were specific for Th. ponticum. Fortunately, the probe could be used in distinguishing six alien chromosome pairs in partial amphiploid Xiaoyan 7430 by fluorescence in situ hybridization (FISH). Furthermore, a Thinopyrum-specific oligonucleotide probe was designed depending on the sequence information of the FISH probe. The novel translocation line could be used in wheat disease resistance breeding, and these specific markers and probes will enable wheat breeders to rapidly trace the alien genome with the novel Pm gene(s).
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Data availability
Phenotype data of agronomic traits are presented in Table 3. The genotype data and materials reported in this study are available upon request.
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Acknowledgements
We sincerely thank Prof. Yilin Zhou at the Institute of Plant Protection, Chinese Academy of Agricultural Sciences, for providing powdery mildew assessment. This project was supported by the National Natural Science Foundation of China (No. 31971875) and the National Key Research and Development Program of China (2016YFD0102000).
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ZSL and QZ conceived the research; GTY and CYT performed the experiments; GTY and QZ drafted the manuscript; HWL and BL provided substantial help in preparing materials. All authors read and approved the final manuscript.
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Yang, G., Tong, C., Li, H. et al. Cytogenetic identification and molecular marker development of a novel wheat–Thinopyrum ponticum translocation line with powdery mildew resistance. Theor Appl Genet 135, 2041–2057 (2022). https://doi.org/10.1007/s00122-022-04092-1
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DOI: https://doi.org/10.1007/s00122-022-04092-1