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Leaf Rust Resistance Gene LR34 is Involved in Powdery Mildew Resistance of Cimmyt Bread Wheat Line Saar

  • M. Lillemo
  • R. P. Singh
  • J. Huerta-Espino
  • X. M. Chen
  • Z. H. He
  • J. K. M. Brown
Part of the Developments in Plant Breeding book series (DIPB, volume 12)

Abstract

The CIMMYT bread wheat line Saar has a high level of adult plant resistance to leaf rust (LR, caused by Puccinia triticina) and stripe rust (YR, caused by P. striiformis f. sp. tritici) based on Lr34/Yr18 in combination with additional minor resistance genes. Because Saar also has good partial resistance to powdery mildew (PM, caused by Blumeria graminis f. sp. tritici), experiments were set up to test whether Lr34 could be involved in its resistance to PM. A population of 113 recombinant inbred F6 lines from a cross between Saar and Avocet-YrA was tested for all three diseases. Correlations among the disease data for LR, YR and PM were strong and highly significant, suggesting that the cross segregated for at least one common genetic factor that affected the resistance to all three diseases. Strong correlations with leaf tip necrosis (LTN), a phenotypic marker for Lr34, indicated that this gene was indeed involved in the PM resistance of Saar. Disease testing of near-isogenic lines for Lr34 and Lr46 in the genetic background of Avocet-YrA and YrLrPrl1 in the background of Lalbahadur showed that all three genes were associated with significantly reduced levels of LR, YR and PM compared to their susceptible genetic backgrounds. It is concluded that resistance to both rust and PM is not only confined to Lr34, but could be a general phenomenon of LTN-associated resistance genes, including Lr46 and YrLrPrl1

Keywords

wheat leaf rust powdery mildew genetic resistance 

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References

  1. Lillemo M, Skinnes H, Singh RP, van Ginkel M (2005) Genetic analysis of partial resistance to powdery mildew in bread wheat line Saar. Plant Dis (accepted)Google Scholar
  2. Navabi A, Singh RP, Tewari JP, Briggs KG (2003) Genetic analysis of adult-plant resistance to leaf rust in five spring wheat genotypes. Plant Dis 87:1522–1529CrossRefGoogle Scholar
  3. Navabi A, Singh RP, Tewari JP, Briggs KG (2004) Inheritance of high levels of adult-plant resistance to stripe rust in five spring wheat genotypes. Crop Sci 44:1156–1162CrossRefGoogle Scholar
  4. Singh RP (1992a) Genetic association of leaf rust resistance gene Lr34 with adult plant resistance to stripe rust in bread wheat. Phytopathology 82:835–838Google Scholar
  5. Singh RP (1992b) Association between gene Lr34 for leaf rust resistance and leaf tip necrosis in wheat. Crop Sci 32:874–878CrossRefGoogle Scholar
  6. Singh RP, Huerta-Espino J, Rajaram S (2000) Achieving near-immunity to leaf rust and stripe rust in wheat by combining slow rusting resistance genes. Acta Phytopathol Entomol Hung 35:133–139Google Scholar
  7. Spielmeyer W, McIntosh RA, Kolmer J, Lagudah ES (2005) Powdery mildew resistance and Lr34/Yr18 genes for durable resistance to leaf and stripe rust cosegregate at a locus on the short arm of chromosome 7D of wheat. Theor. Appl. Genet. 111:731–735Google Scholar

Copyright information

© Springer 2007

Authors and Affiliations

  • M. Lillemo
    • 1
  • R. P. Singh
    • 2
  • J. Huerta-Espino
    • 3
  • X. M. Chen
    • 4
  • Z. H. He
    • 5
  • J. K. M. Brown
    • 6
  1. 1.Dept. of Plant and Environmental SciencesNorwegian University of Life SciencesN-1432 ÅsNorway
  2. 2.CIMMYTMéxico
  3. 3.Campo Experimental Valle de Mexico-INIFAPChapingoMexico
  4. 4.Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijingP.R. China
  5. 5.CIMMYT, c/o Chinese Academy of Agricultural SciencesBeijingP.R. China
  6. 6.Dept. of Disease and Stress BiologyJohn Innes CentreColneyUK

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