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Theoretical and Applied Genetics

, Volume 122, Issue 8, pp 1537–1545 | Cite as

Development and characterization of wheat-Ae. searsii Robertsonian translocations and a recombinant chromosome conferring resistance to stem rust

  • Wenxuan Liu
  • Yue Jin
  • Matthew Rouse
  • Bernd Friebe
  • Bikram Gill
  • Michael O. Pumphrey
Original Paper

Abstract

The emergence of a new highly virulent race of stem rust (Puccinia graminis tritici), Ug99, rapid evolution of new Ug99 derivative races overcoming resistance of widely deployed genes, and spread towards important wheat growing areas now potentially threaten world food security. Exploiting novel genes effective against Ug99 from wild relatives of wheat is one of the most promising strategies for the protection of the wheat crop. A new source of resistance to Ug99 was identified in the short arm of the Aegilops searsii chromosome 3Ss by screening wheat- Ae. searsii introgression libraries available as individual chromosome and chromosome arm additions to the wheat genome. For transferring this resistance gene into common wheat, we produced three double-monosomic chromosome populations (3A/3Ss, 3B/3Ss and 3D/3Ss) and then applied integrated stem rust screening, molecular maker analysis, and cytogenetic analysis to identify resistant wheat-Ae. searsii Robertsonian translocation. Three Robertsonian translocations (T3AL·3SsS, T3BL·3SsS and T3DL·3SsS) and one recombinant (T3DS-3SsS·3SsL) with stem rust resistance were identified and confirmed to be genetically compensating on the basis of genomic in situ hybridization, analysis of 3A, 3B, 3D and 3SsS-specific SSR/STS-PCR markers, and C-banding. In addition, nine SSR/STS-PCR markers of 3SsS-specific were developed for marker-assisted selection of the resistant gene. Efforts to reduce potential linkage drag associated with 3SsS of Ae. searsii are currently under way.

Keywords

Stem Rust Infection Type Substitution Line Translocation Line Robertsonian Translocation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This research was part of the project “Durable Rust Resistance in Wheat” supported by Bill and Melinda Gates Foundation and a special USDA-CSREES grant to the Wheat Genetic and Genomic Resources Center at Kansas State University. We thank W. John Raupp for critical editorial review of the manuscript and Shuangye Wu for her technical assistance. This is contribution number 11-148-J from the Kansas Agricultural Experiment Station, Kansas State University, Manhattan, KS 66506-5502, USA.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Wenxuan Liu
    • 1
  • Yue Jin
    • 4
  • Matthew Rouse
    • 4
  • Bernd Friebe
    • 1
  • Bikram Gill
    • 1
  • Michael O. Pumphrey
    • 2
    • 3
  1. 1.Wheat Genetic and Genomic Resources Center, Department of Plant Pathology, Throckmorton Plant Sciences CenterKansas State UniversityManhattanUSA
  2. 2.USDA-ARS Hard Winter Wheat Genetics Research UnitManhattanUSA
  3. 3.Spring Wheat Breeding and Genetics, Department of Crop and Soil Sciences, 291D Johnson HallWashington State UniversityPullmanUSA
  4. 4.USDA-ARS Cereal Disease LaboratoryUniversity of MinnesotaSt. PaulUSA

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