Cytogenetic identification and molecular marker development of a novel wheat–Thinopyrum ponticum translocation line with powdery mildew resistance
Cytogenetic identification and molecular marker development of a novel wheat–Thinopyrum ponticum translocation line with powdery mildew resistance
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DOI：
10.1007/s00122-022-04092-1
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发表时间：
2022-04
影响因子：
5.4
通讯作者：
Guotang Yang;Chunyan Tong;Hongwei Li;Bin Li;Zhen-sheng Li;Q. Zheng
中科院分区：
文献类型：
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作者：
Guotang Yang;Chunyan Tong;Hongwei Li;Bin Li;Zhen-sheng Li;Q. Zheng
Key messageA new wheat–Thinopyrum ponticumtranslocation line with excellent powdery mildew resistance was produced, and alien-specific PCR markers and FISH probes were developed by SLAF-seq.AbstractPowdery 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 ofTh. ponticum, we have been working to transfer the resistance genes fromTh. ponticumto wheat by creating translocation lines. In this study, a new wheat–Th. ponticumtranslocation line with excellent resistance and agronomic performance was developed and through seedling disease evaluation, gene postulation and diagnostic marker analysis proved to carry a novelPmgene derived fromTh. 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 forTh. 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, aThinopyrum-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 novelPmgene(s).
