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Durable Leaf Rust Resistance in Wheat

Durable Leaf Rust Resistance in Wheat. J. A. Kolmer USDA-ARS Cereal Disease Laboratory. Puccinia triticina - Wheat Leaf Rust. Most common rust of wheat in U.S. Occurs nearly wherever wheat is grown Asexual in North America 50-60 races in U.S. Annual yield losses.

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Durable Leaf Rust Resistance in Wheat

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  1. Durable Leaf Rust Resistance in Wheat J. A. Kolmer USDA-ARS Cereal Disease Laboratory

  2. Puccinia triticina - Wheat Leaf Rust • Most common rust of wheat in U.S. • Occurs nearly wherever wheat is grown • Asexual in North America 50-60 races in U.S. • Annual yield losses

  3. Leaf Rust Virulence Dynamics Kansas - Nebraska

  4. U.S. Hard Red Spring Wheat • Wheaton (1983) Lr10, Lr23, Lr13, Lr34 +? Norm (1992) Lr1, Lr10, Lr13, Lr16, Lr23, Lr34 both highly resistance since release • Alsen (2000) Lr2a, Lr10, Lr13, Lr23, Lr34 R-MR • Knudson (2002) Lr3, Lr10, Lr13, Lr16, Lr23, Lr34 Briggs (2002) Lr13, Lr16, Lr30, Lr34 Both highly resistant • Marshall (1982) Lr2a, Lr10, Lr13, Lr34 Mod. Susceptible

  5. Effective Lr genesin spring wheat cvs. Lr16, Lr23, Lr34 common in spring wheat

  6. South American Landraces • Americano 25e (1918) Lr3, Lr16, LrX1,LrAPR • Americano 44d (1918) 1-2 APR genes THBJ Field • Tc*2/Am. 25e LrAPR ;2- 30 MRMS • Tc*2/Am.44d LrAPR ;23 20 M • Tc*2/Am.44d LrAPR ;2- 20 MRMS

  7. U.S. Soft Red Winter Wheat • Coker 9663 (1996) Lr9, Lr10, Lr14a R-MR • Pioneer 26R61 (1999) Lr13, Lr14b, Lr26 R-MR

  8. Lr34 in U.S. Wheat Hard red spring wheat • Minnesota common 1966-mid 1990s FHB resistant cvs. lack Lr34 • South Dakota - few cvs. with Lr34 • North Dakota - few cvs. with Lr34 TcLr34 Tc

  9. Lr34 in U.S. Wheat TcLr34 Tc • Soft red winter wheat - old and new cvs. - not present • Hard red winter wheat - very rare • Western spring wheat - not present CSIRO PCR Marker Tip die back

  10. Lr genes in U.S. Wheat • Seedling resistance genes - lower ploidy relatives - common wheat Virulent races arise quickly Lr9, Lr16, Lr26 - still provide some resistance • Adult Plant Genes Lr34 - not sufficient alone Lr12 - ineffective Lr13 - ineffective Lr23 - characteristics of APR • Combinations of Lr34 + effective seedling genes = best resistance TcLr34 TcLr13 TcLr12 Tc

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