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Theoretical and Applied Genetics

, Volume 120, Issue 4, pp 691–697 | Cite as

Diagnostic and co-dominant PCR markers for wheat stem rust resistance genes Sr25 and Sr26

  • Sixin Liu
  • Long-Xi Yu
  • Ravi P. Singh
  • Yue Jin
  • Mark E. Sorrells
  • James A. Anderson
Original Paper

Abstract

Wheat stem rust, caused by Puccinia graminis f. sp. tritici, is one of the most destructive diseases of wheat. A new race of the pathogen named TTKSK (syn. Ug99) and its derivatives detected in East Africa are virulent to many designated and undesignated stem rust resistance genes. The emergence and spread of those races pose an imminent threat to wheat production worldwide. Genes Sr25 and Sr26 transferred into wheat from Thinopyrum ponticum are effective against these new races. DNA markers for Sr25 and Sr26 are needed to pyramid both genes into adapted germplasm. The previously published dominant markers Gb for Sr25 and Sr26#43 for Sr26 were validated with eight wheat lines with or without Sr25 or Sr26. We tested six published STS (sequence tagged site) markers amplifying diagnostic bands of Th. ponticum. Marker BF145935 consistently amplified well and can be used as a co-dominant marker for Sr25. Among 16 STS markers developed from wheat ESTs mapped to deletion bin 6AL8-0.90-1.00, none was co-dominant for tagging Sr26. However, five 6A-specific markers were identified. Multiplex PCR with marker Sr26#43 and 6A-specific marker BE518379 can be used as a co-dominant marker for Sr26. The co-dominant markers for Sr25 and Sr26 were validated with 37 lines with known stem rust resistance genes. A diverse set of germplasm consisting 170 lines from CIMMYT, China, USA and other counties were screened with the co-dominant markers for Sr25 and Sr26. Five lines with the diagnostic fragment for Sr25 were identified, and they all have ‘Wheatear’ in their pedigrees, which is known to carry Sr25. None of the 170 lines tested had Sr26, as expected.

Keywords

Stem Rust Wheat Line Rust Resistance Gene Marker Genotype Stem Rust Resistance Gene 
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 study is a part of the Durable Rust Resistance in Wheat Project funded by the Bill and Melinda Gates Foundation. We would like to thank Drs. Zhonghu He, Ian S. Dundas for providing Chinese wheat lines and the Sr26-containing lines with shortened alien segment used in this study, and Jennifer A. Gee for her technical support in the lab.

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Sixin Liu
    • 1
  • Long-Xi Yu
    • 2
  • Ravi P. Singh
    • 3
  • Yue Jin
    • 4
  • Mark E. Sorrells
    • 2
  • James A. Anderson
    • 1
  1. 1.Department of Agronomy and Plant GeneticsUniversity of MinnesotaSt. PaulUSA
  2. 2.Department of Plant Breeding and GeneticsCornell UniversityIthacaUSA
  3. 3.International Maize and Wheat Improvement Center (CIMMYT)Mexico D.F.Mexico
  4. 4.USDA-ARS Cereal Disease LaboratoryUniversity of MinnesotaSt. PaulUSA

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