1 / 10

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.

allegra-kirk
Télécharger la présentation

Durable Leaf Rust Resistance in Wheat

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related