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Pm37, a new broadly effective powdery mildew resistance gene from Triticum timopheevii

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Powdery mildew is an important foliar disease in wheat, especially in areas with a cool or maritime climate. A dominant powdery mildew resistance gene transferred to the hexaploid germplasm line NC99BGTAG11 from T. timopheevii subsp. armeniacum was mapped distally on the long arm of chromosome 7A. Differential reactions were observed between the resistance gene in NC99BGTAG11 and the alleles of the Pm1 locus that is also located on chromosome arm 7AL. Observed segregation in F2:3 lines from the cross NC99BGTAG11 × Axminster (Pm1a) demonstrate that germplasm line NC99BGTAG11 carries a novel powdery mildew resistance gene, which is now designated as Pm37. This new gene is highly effective against all powdery mildew isolates tested so far. Analyses of the population with molecular markers indicate that Pm37 is located 16 cM proximal to the Pm1 complex. Simple sequence repeat (SSR) markers Xgwm332 and Xwmc790 were located 0.5 cM proximal and distal, respectively, to Pm37. In order to identify new markers in the region, wheat expressed sequence tags (ESTs) located in the distal 10% of 7AL that were orthologous to sequences from chromosome 6 of rice were targeted. The two new EST-derived STS markers were located distal to Pm37 and one marker was closely linked to the Pm1a region. These new markers can be used in marker-assisted selection schemes to develop wheat cultivars with pyramids of powdery mildew resistance genes, including combinations of Pm37 in coupling linkage with alleles of the Pm1 locus.

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The authors would like to thank Dr. Marc Cubeta for his valuable input into this project. We would also like to thank Jared Smith, Kim Howell and Lynda Witcher for their greenhouse and laboratory assistance. This research was supported by the USDA-ARS and the USDA-CSREES National Research Initiative CAP grant 2005-05130.

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Correspondence to G. Brown-Guedira.

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Communicated by J. Dubcovsky.

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Perugini, L.D., Murphy, J.P., Marshall, D. et al. Pm37, a new broadly effective powdery mildew resistance gene from Triticum timopheevii. Theor Appl Genet 116, 417–425 (2008). https://doi.org/10.1007/s00122-007-0679-x

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  • Powdery Mildew
  • Simple Sequence Repeat Marker
  • Chinese Spring
  • Powdery Mildew Resistance
  • Deletion Line