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Development and characterization of a wheat–Leymus mollis Lm#7Ns disomic addition line with resistance to stripe rust

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Abstract

A new wheat–Leymus mollis (2n = 4x = 28, NsNsXmXm) disomic addition line M11003-3-1-12-10 (M10) was developed and selected from the BC1F5 progeny of a cross between wheat cv. 7182 and octoploid Tritileymus M47 (2n = 8x = 56, AABBDDNsNs). Cytological observations showed that M10 contained 44 chromosomes and formed 22 bivalents at meiotic metaphase I. The sequential fluorescence in situ hybridization–genomic in situ hybridization (FISH–GISH) analysis using the oligonucleotide Oligo-pSc119.2, Oligo-pTa535 and L. mollis genomic DNA as probes revealed that M10 carried a pair of L. mollis chromosomes and a whole set of 42 wheat chromosomes. Two EST–STS markers and six PLUG (PCR-based Landmark Unique Gene) markers confirmed that the added L. mollis chromosomes in M10 belonged to homoeologous group 7 and were designated as Lm#7Ns, so M10 was deduced to be a wheat–L. mollis Lm#7Ns disomic addition line. Field disease evaluation demonstrated that M10 showed a high level of resistance to stripe rust at the adult stage and the resistance could be ultimately traced to the L. mollis. Consequently, the introduced Lm#7Ns chromosomes were responsible for the stripe rust resistance. The novel disomic addition line M10 could be exploited as an important genetic resource for wheat resistance breeding.

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Acknowledgements

This work was supported by grants from the National Natural Science Foundation of China (Grant No. 31701416), Scientific research plan projects of Shaanxi Education Department (Grant No. 20JK0629), Talent project of Weinan Normal University (Grant No. 18ZRRC14), Zhongying Tang Breeding Funding Project of USA at the Northwest A&F University in China and the innovation project of science and technology of Shaanxi province of China (Grant No. 2015KTZDNY01-01-02).

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Correspondence to W. Q. Ji.

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Yang, X.F., Wang, C.Y., Chen, C.H. et al. Development and characterization of a wheat–Leymus mollis Lm#7Ns disomic addition line with resistance to stripe rust. CEREAL RESEARCH COMMUNICATIONS 48, 467–476 (2020). https://doi.org/10.1007/s42976-020-00058-5

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  • DOI: https://doi.org/10.1007/s42976-020-00058-5

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