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Genetic mapping of two powdery mildew resistance genes in einkorn (Triticum monococcum L.) accessions

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Abstract

Powdery mildew is a severe foliar disease for wheat and could cause great yield loss in epidemic years. To explore new powdery mildew resistance genes, two einkorn accessions including TA2033 and M80, both resistant to this disease, were studied for the inheritance of resistance. Each accession possessed a single but different dominant resistance gene that was designated as Mlm2033 and Mlm80, respectively. Marker mapping indicated that they are both linked to Xgwm344 on the long arm of chromosome 7A. To establish their genetic relationship with Pm1 on 7AL, five RFLP markers previously reported to co-segregate with Pm1a were converted to STS markers. Three of them detected polymorphism between the mapping parents and were mapped close to Mlm2033 or Mlm80 or both. Xmag2185, the locus determined by the STS marker derived from PSR680, one of the RFLP markers, was placed less than 2 cM away from them. The allelism test indicated that Mlm2033 and Mlm80 are likely allelic to each other. In addition, through comparative and EST mapping, more markers linked to these two genes were identified. The high density mapping of Mlm2033 and Mlm80 will contribute to map-based cloning of the Pm1 locus. The markers for both genes will also facilitate their transfer to wheat.

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Acknowledgments

This project was partially supported by NSFC Fund (30025030), and MOE program for outstanding young faculty.

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Correspondence to Zhengqiang Ma.

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Communicated by F. Ordon.

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Yao, G., Zhang, J., Yang, L. et al. Genetic mapping of two powdery mildew resistance genes in einkorn (Triticum monococcum L.) accessions. Theor Appl Genet 114, 351–358 (2007). https://doi.org/10.1007/s00122-006-0438-4

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  • DOI: https://doi.org/10.1007/s00122-006-0438-4

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